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+<!DOCTYPE html>
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+<html class="writer-html5" lang="en" data-content_root="../">
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+<head>
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+ <meta charset="utf-8" /><meta name="viewport" content="width=device-width, initial-scale=1" />
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+ <meta name="viewport" content="width=device-width, initial-scale=1.0" />
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+ <title>Reading QR Codes — PHP-QRCode main
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+ Manual</title>
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+ <link rel="stylesheet" type="text/css" href="../_static/pygments.css?v=fa44fd50" />
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+ <link rel="stylesheet" type="text/css" href="../_static/css/theme.css?v=e59714d7" />
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+ <script src="../_static/jquery.js?v=5d32c60e"></script>
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+ <script src="../_static/_sphinx_javascript_frameworks_compat.js?v=2cd50e6c"></script>
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+ <script src="../_static/documentation_options.js?v=a8da1a53"></script>
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+ <script src="../_static/doctools.js?v=9bcbadda"></script>
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+ <script src="../_static/sphinx_highlight.js?v=dc90522c"></script>
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+ <script src="../_static/js/theme.js"></script>
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+ <link rel="index" title="Index" href="../genindex.html" />
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+ <link rel="search" title="Search" href="../search.html" />
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+ <link rel="next" title="Logos and logo space" href="Logos.html" />
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+ <link rel="prev" title="Configuration settings" href="Configuration-settings.html" />
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+</head>
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+<body class="wy-body-for-nav">
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+ <div class="wy-grid-for-nav">
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+ <div class="wy-side-nav-search" >
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+
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+
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+ <a href="../index.html" class="icon icon-home">
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+ PHP-QRCode
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+ </a>
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+<div role="search">
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+ <form id="rtd-search-form" class="wy-form" action="../search.html" method="get">
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+ <input type="text" name="q" placeholder="Search docs" aria-label="Search docs" />
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+ <input type="hidden" name="check_keywords" value="yes" />
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+ <input type="hidden" name="area" value="default" />
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+ </form>
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+</div>
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+ </div><div class="wy-menu wy-menu-vertical" data-spy="affix" role="navigation" aria-label="Navigation menu">
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+ <p class="caption" role="heading"><span class="caption-text">Usage</span></p>
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+<ul class="current">
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+<li class="toctree-l1"><a class="reference internal" href="Overview.html">Overview</a><ul>
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+<li class="toctree-l2"><a class="reference internal" href="Overview.html#features">Features</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Overview.html#requirements">Requirements</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Overview.html#framework-integration">Framework Integration</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Overview.html#shameless-advertising">Shameless advertising</a></li>
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+</ul>
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+</li>
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+<li class="toctree-l1"><a class="reference internal" href="Installation.html">Installation</a><ul>
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+<li class="toctree-l2"><a class="reference internal" href="Installation.html#installation-with-composer">Installation with Composer</a><ul>
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+<li class="toctree-l3"><a class="reference internal" href="Installation.html#composer-json">composer.json</a><ul>
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+<li class="toctree-l4"><a class="reference internal" href="Installation.html#version-switch">Version switch</a></li>
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+</ul>
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+</li>
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+<li class="toctree-l3"><a class="reference internal" href="Installation.html#terminal">Terminal</a></li>
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+</ul>
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+</li>
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+<li class="toctree-l2"><a class="reference internal" href="Installation.html#manual-installation">Manual installation</a><ul>
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+<li class="toctree-l3"><a class="reference internal" href="Installation.html#can-i-use-this-library-without-using-composer">Can I use this library without using composer?</a></li>
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+</ul>
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+</li>
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+<li class="toctree-l2"><a class="reference internal" href="Installation.html#supported-php-versions-extension-requirements">Supported PHP versions & extension requirements</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Installation.html#imagemagick">ImageMagick</a></li>
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+</ul>
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+</li>
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+<li class="toctree-l1"><a class="reference internal" href="Quickstart.html">Quickstart</a><ul>
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+<li class="toctree-l2"><a class="reference internal" href="Quickstart.html#import-the-library">Import the library</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Quickstart.html#create-your-first-qr-code">Create your first QR Code</a><ul>
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+<li class="toctree-l3"><a class="reference internal" href="Quickstart.html#configuration">Configuration</a></li>
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+</ul>
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+</li>
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+<li class="toctree-l2"><a class="reference internal" href="Quickstart.html#notes">Notes</a></li>
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+</ul>
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+</li>
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+<li class="toctree-l1"><a class="reference internal" href="Advanced-usage.html">Advanced usage</a><ul>
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+<li class="toctree-l2"><a class="reference internal" href="Advanced-usage.html#configuration-via-qroptions">Configuration via <code class="docutils literal notranslate"><span class="pre">QROptions</span></code></a><ul>
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+<li class="toctree-l3"><a class="reference internal" href="Advanced-usage.html#supply-an-iterable-of-options">Supply an <code class="docutils literal notranslate"><span class="pre">iterable</span></code> of options</a></li>
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+<li class="toctree-l3"><a class="reference internal" href="Advanced-usage.html#load-and-save-options-from-to-json">Load and save options from/to JSON</a></li>
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+<li class="toctree-l3"><a class="reference internal" href="Advanced-usage.html#extending-the-qroptions-class">Extending the <code class="docutils literal notranslate"><span class="pre">QROptions</span></code> class</a></li>
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+</ul>
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+</li>
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+<li class="toctree-l2"><a class="reference internal" href="Advanced-usage.html#qrcode-methods"><code class="docutils literal notranslate"><span class="pre">QRCode</span></code> methods</a><ul>
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+<li class="toctree-l3"><a class="reference internal" href="Advanced-usage.html#render-a-qrmatrix-instance">Render a <code class="docutils literal notranslate"><span class="pre">QRMatrix</span></code> instance</a></li>
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+<li class="toctree-l3"><a class="reference internal" href="Advanced-usage.html#mixed-mode">Mixed mode</a></li>
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+</ul>
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+</li>
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+<li class="toctree-l2"><a class="reference internal" href="Advanced-usage.html#common-output-options">Common output options</a><ul>
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+<li class="toctree-l3"><a class="reference internal" href="Advanced-usage.html#save-to-file">Save to file</a></li>
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+<li class="toctree-l3"><a class="reference internal" href="Advanced-usage.html#base64-uri-output">Base64 URI output</a></li>
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+<li class="toctree-l3"><a class="reference internal" href="Advanced-usage.html#return-the-image-resource">Return the image resource</a></li>
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+</ul>
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+</li>
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+</ul>
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+</li>
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+<li class="toctree-l1"><a class="reference internal" href="Configuration-settings.html">Configuration settings</a><ul>
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+<li class="toctree-l2"><a class="reference internal" href="Configuration-settings.html#version">version</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Configuration-settings.html#versionmin">versionMin</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Configuration-settings.html#versionmax">versionMax</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Configuration-settings.html#ecclevel">eccLevel</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Configuration-settings.html#maskpattern">maskPattern</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Configuration-settings.html#addquietzone">addQuietzone</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Configuration-settings.html#quietzonesize">quietzoneSize</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Configuration-settings.html#outputinterface">outputInterface</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Configuration-settings.html#returnresource">returnResource</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Configuration-settings.html#cachefile">cachefile</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Configuration-settings.html#outputbase64">outputBase64</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Configuration-settings.html#eol">eol</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Configuration-settings.html#bgcolor">bgColor</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Configuration-settings.html#invertmatrix">invertMatrix</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Configuration-settings.html#drawlightmodules">drawLightModules</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Configuration-settings.html#drawcircularmodules">drawCircularModules</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Configuration-settings.html#circleradius">circleRadius</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Configuration-settings.html#keepassquare">keepAsSquare</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Configuration-settings.html#connectpaths">connectPaths</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Configuration-settings.html#excludefromconnect">excludeFromConnect</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Configuration-settings.html#modulevalues">moduleValues</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Configuration-settings.html#addlogospace">addLogoSpace</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Configuration-settings.html#logospacewidth">logoSpaceWidth</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Configuration-settings.html#logospaceheight">logoSpaceHeight</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Configuration-settings.html#logospacestartx">logoSpaceStartX</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Configuration-settings.html#logospacestarty">logoSpaceStartY</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Configuration-settings.html#scale">scale</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Configuration-settings.html#imagetransparent">imageTransparent</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Configuration-settings.html#transparencycolor">transparencyColor</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Configuration-settings.html#quality">quality</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Configuration-settings.html#gdimageuseupscale">gdImageUseUpscale</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Configuration-settings.html#imagickformat">imagickFormat</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Configuration-settings.html#cssclass">cssClass</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Configuration-settings.html#svgaddxmlheader">svgAddXmlHeader</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Configuration-settings.html#svgdefs">svgDefs</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Configuration-settings.html#svgpreserveaspectratio">svgPreserveAspectRatio</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Configuration-settings.html#svgusefillattributes">svgUseFillAttributes</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Configuration-settings.html#textlinestart">textLineStart</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Configuration-settings.html#jsonflags">jsonFlags</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Configuration-settings.html#fpdfmeasureunit">fpdfMeasureUnit</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Configuration-settings.html#xmlstylesheet">xmlStylesheet</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Configuration-settings.html#readeruseimagickifavailable">readerUseImagickIfAvailable</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Configuration-settings.html#readergrayscale">readerGrayscale</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Configuration-settings.html#readerinvertcolors">readerInvertColors</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Configuration-settings.html#readerincreasecontrast">readerIncreaseContrast</a></li>
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+</ul>
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+</li>
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+<li class="toctree-l1 current"><a class="current reference internal" href="#">Reading QR Codes</a><ul>
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+<li class="toctree-l2"><a class="reference internal" href="#basic-usage">Basic usage</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="#the-luminancesourceinterface">The <code class="docutils literal notranslate"><span class="pre">LuminanceSourceInterface</span></code></a></li>
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+<li class="toctree-l2"><a class="reference internal" href="#the-decoder">The <code class="docutils literal notranslate"><span class="pre">Decoder</span></code></a></li>
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+<li class="toctree-l2"><a class="reference internal" href="#general-considerations">General considerations</a></li>
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+</ul>
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+</li>
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+<li class="toctree-l1"><a class="reference internal" href="Logos.html">Logos and logo space</a><ul>
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+<li class="toctree-l2"><a class="reference internal" href="Logos.html#info">Info</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="Logos.html#adding-a-logo-space">Adding a logo space</a></li>
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+</ul>
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+</li>
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+</ul>
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+<p class="caption" role="heading"><span class="caption-text">Customizing output</span></p>
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+<ul>
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+<li class="toctree-l1"><a class="reference internal" href="../Customizing/Module-Values.html">Module values</a><ul>
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+<li class="toctree-l2"><a class="reference internal" href="../Customizing/Module-Values.html#basics">Basics</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="../Customizing/Module-Values.html#assigning-values">Assigning values</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="../Customizing/Module-Values.html#handling-in-your-own-qroutputinterface">Handling in your own <code class="docutils literal notranslate"><span class="pre">QROutputInterface</span></code></a><ul>
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+<li class="toctree-l3"><a class="reference internal" href="../Customizing/Module-Values.html#setting-module-values">Setting module values</a></li>
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+<li class="toctree-l3"><a class="reference internal" href="../Customizing/Module-Values.html#using-the-module-values">Using the module values</a></li>
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+</ul>
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+</li>
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+</ul>
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+</li>
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+<li class="toctree-l1"><a class="reference internal" href="../Customizing/QROutputAbstract.html"><code class="docutils literal notranslate"><span class="pre">QROutputAbstract</span></code></a><ul>
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+<li class="toctree-l2"><a class="reference internal" href="../Customizing/QROutputAbstract.html#properties">Properties</a><ul>
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+<li class="toctree-l3"><a class="reference internal" href="../Customizing/QROutputAbstract.html#options-and-matrix"><code class="docutils literal notranslate"><span class="pre">$options</span></code> and <code class="docutils literal notranslate"><span class="pre">$matrix</span></code></a></li>
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+<li class="toctree-l3"><a class="reference internal" href="../Customizing/QROutputAbstract.html#modulecount-scale-and-length"><code class="docutils literal notranslate"><span class="pre">$moduleCount</span></code>, <code class="docutils literal notranslate"><span class="pre">$scale</span></code> and <code class="docutils literal notranslate"><span class="pre">$length</span></code></a></li>
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+<li class="toctree-l3"><a class="reference internal" href="../Customizing/QROutputAbstract.html#modulevalues"><code class="docutils literal notranslate"><span class="pre">$moduleValues</span></code></a></li>
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+<li class="toctree-l3"><a class="reference internal" href="../Customizing/QROutputAbstract.html#copies-of-qroptions-values">Copies of <code class="docutils literal notranslate"><span class="pre">QROptions</span></code> values</a></li>
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+</ul>
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+</li>
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+<li class="toctree-l2"><a class="reference internal" href="../Customizing/QROutputAbstract.html#methods">Methods</a><ul>
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+<li class="toctree-l3"><a class="reference internal" href="../Customizing/QROutputAbstract.html#setmodulevalues"><code class="docutils literal notranslate"><span class="pre">setModuleValues()</span></code></a></li>
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+<li class="toctree-l3"><a class="reference internal" href="../Customizing/QROutputAbstract.html#modulevalueisvalid"><code class="docutils literal notranslate"><span class="pre">moduleValueIsValid()</span></code></a></li>
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+<li class="toctree-l3"><a class="reference internal" href="../Customizing/QROutputAbstract.html#preparemodulevalue"><code class="docutils literal notranslate"><span class="pre">prepareModuleValue()</span></code></a></li>
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+<li class="toctree-l3"><a class="reference internal" href="../Customizing/QROutputAbstract.html#getdefaultmodulevalue"><code class="docutils literal notranslate"><span class="pre">getDefaultModuleValue()</span></code></a></li>
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+<li class="toctree-l3"><a class="reference internal" href="../Customizing/QROutputAbstract.html#getmodulevalue-and-getmodulevalueat"><code class="docutils literal notranslate"><span class="pre">getModuleValue()</span></code> and <code class="docutils literal notranslate"><span class="pre">getModuleValueAt()</span></code></a></li>
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+<li class="toctree-l3"><a class="reference internal" href="../Customizing/QROutputAbstract.html#setmatrixdimensions"><code class="docutils literal notranslate"><span class="pre">setMatrixDimensions()</span></code></a></li>
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+<li class="toctree-l3"><a class="reference internal" href="../Customizing/QROutputAbstract.html#getoutputdimensions"><code class="docutils literal notranslate"><span class="pre">getOutputDimensions()</span></code></a></li>
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+<li class="toctree-l3"><a class="reference internal" href="../Customizing/QROutputAbstract.html#collectmodules"><code class="docutils literal notranslate"><span class="pre">collectModules()</span></code></a></li>
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+<li class="toctree-l3"><a class="reference internal" href="../Customizing/QROutputAbstract.html#savetofile-and-tobase64datauri"><code class="docutils literal notranslate"><span class="pre">saveToFile()</span></code> and <code class="docutils literal notranslate"><span class="pre">toBase64DataURI()</span></code></a></li>
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+</ul>
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+</li>
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+</ul>
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+</li>
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+<li class="toctree-l1"><a class="reference internal" href="../Customizing/Custom-output-interface.html">Custom <code class="docutils literal notranslate"><span class="pre">QROutputInterface</span></code></a><ul>
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+<li class="toctree-l2"><a class="reference internal" href="../Customizing/Custom-output-interface.html#class-skeleton">Class skeleton</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="../Customizing/Custom-output-interface.html#module-values">Module values</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="../Customizing/Custom-output-interface.html#transform-the-output">Transform the output</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="../Customizing/Custom-output-interface.html#run-the-custom-output">Run the custom output</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="../Customizing/Custom-output-interface.html#summary">Summary</a></li>
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+</ul>
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+</li>
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+</ul>
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+<p class="caption" role="heading"><span class="caption-text">Built-In Output Classes</span></p>
|
|
|
+<ul>
|
|
|
+<li class="toctree-l1"><a class="reference internal" href="../Built-In-Output/QREps.html">QREps</a><ul>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Built-In-Output/QREps.html#example">Example</a></li>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Built-In-Output/QREps.html#additional-methods">Additional methods</a></li>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Built-In-Output/QREps.html#options-that-affect-this-class">Options that affect this class</a></li>
|
|
|
+</ul>
|
|
|
+</li>
|
|
|
+<li class="toctree-l1"><a class="reference internal" href="../Built-In-Output/QRFpdf.html">QRFpdf</a><ul>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Built-In-Output/QRFpdf.html#example">Example</a></li>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Built-In-Output/QRFpdf.html#additional-methods">Additional methods</a></li>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Built-In-Output/QRFpdf.html#options-that-affect-this-class">Options that affect this class</a></li>
|
|
|
+</ul>
|
|
|
+</li>
|
|
|
+<li class="toctree-l1"><a class="reference internal" href="../Built-In-Output/QRGdImage.html">QRGdImage</a><ul>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Built-In-Output/QRGdImage.html#example">Example</a></li>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Built-In-Output/QRGdImage.html#additional-methods">Additional methods</a></li>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Built-In-Output/QRGdImage.html#options-that-affect-this-class">Options that affect this class</a></li>
|
|
|
+</ul>
|
|
|
+</li>
|
|
|
+<li class="toctree-l1"><a class="reference internal" href="../Built-In-Output/QRImagick.html">QRImagick</a><ul>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Built-In-Output/QRImagick.html#example">Example</a></li>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Built-In-Output/QRImagick.html#additional-methods">Additional methods</a></li>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Built-In-Output/QRImagick.html#options-that-affect-this-class">Options that affect this class</a></li>
|
|
|
+</ul>
|
|
|
+</li>
|
|
|
+<li class="toctree-l1"><a class="reference internal" href="../Built-In-Output/QRInterventionImage.html">QRInterventionImage</a><ul>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Built-In-Output/QRInterventionImage.html#example">Example</a></li>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Built-In-Output/QRInterventionImage.html#additional-methods">Additional methods</a></li>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Built-In-Output/QRInterventionImage.html#options-that-affect-this-class">Options that affect this class</a></li>
|
|
|
+</ul>
|
|
|
+</li>
|
|
|
+<li class="toctree-l1"><a class="reference internal" href="../Built-In-Output/QRMarkupHTML.html">QRMarkupHTML</a><ul>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Built-In-Output/QRMarkupHTML.html#example">Example</a></li>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Built-In-Output/QRMarkupHTML.html#additional-methods">Additional methods</a></li>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Built-In-Output/QRMarkupHTML.html#options-that-affect-this-class">Options that affect this class</a></li>
|
|
|
+</ul>
|
|
|
+</li>
|
|
|
+<li class="toctree-l1"><a class="reference internal" href="../Built-In-Output/QRMarkupSVG.html">QRMarkupSVG</a><ul>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Built-In-Output/QRMarkupSVG.html#example">Example</a></li>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Built-In-Output/QRMarkupSVG.html#additional-methods">Additional methods</a></li>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Built-In-Output/QRMarkupSVG.html#options-that-affect-this-class">Options that affect this class</a></li>
|
|
|
+</ul>
|
|
|
+</li>
|
|
|
+<li class="toctree-l1"><a class="reference internal" href="../Built-In-Output/QRMarkupXML.html">QRMarkupXML</a><ul>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Built-In-Output/QRMarkupXML.html#example">Example</a></li>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Built-In-Output/QRMarkupXML.html#additional-methods">Additional methods</a></li>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Built-In-Output/QRMarkupXML.html#options-that-affect-this-class">Options that affect this class</a></li>
|
|
|
+</ul>
|
|
|
+</li>
|
|
|
+<li class="toctree-l1"><a class="reference internal" href="../Built-In-Output/QRStringJSON.html">QRStringJSON</a><ul>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Built-In-Output/QRStringJSON.html#example">Example</a></li>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Built-In-Output/QRStringJSON.html#previous-functionality">Previous functionality</a></li>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Built-In-Output/QRStringJSON.html#additional-methods">Additional methods</a></li>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Built-In-Output/QRStringJSON.html#options-that-affect-this-class">Options that affect this class</a></li>
|
|
|
+</ul>
|
|
|
+</li>
|
|
|
+<li class="toctree-l1"><a class="reference internal" href="../Built-In-Output/QRStringText.html">QRStringText</a><ul>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Built-In-Output/QRStringText.html#example">Example</a></li>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Built-In-Output/QRStringText.html#additional-methods">Additional methods</a></li>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Built-In-Output/QRStringText.html#options-that-affect-this-class">Options that affect this class</a></li>
|
|
|
+</ul>
|
|
|
+</li>
|
|
|
+</ul>
|
|
|
+<p class="caption" role="heading"><span class="caption-text">Appendix</span></p>
|
|
|
+<ul>
|
|
|
+<li class="toctree-l1"><a class="reference internal" href="../Appendix/Terminology.html">Terminology</a><ul>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Appendix/Terminology.html#qr-code">QR Code</a></li>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Appendix/Terminology.html#matrix">Matrix</a><ul>
|
|
|
+<li class="toctree-l3"><a class="reference internal" href="../Appendix/Terminology.html#module">Module</a></li>
|
|
|
+<li class="toctree-l3"><a class="reference internal" href="../Appendix/Terminology.html#version">Version</a></li>
|
|
|
+</ul>
|
|
|
+</li>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Appendix/Terminology.html#function-patterns">Function Patterns</a><ul>
|
|
|
+<li class="toctree-l3"><a class="reference internal" href="../Appendix/Terminology.html#finder-pattern">Finder Pattern</a></li>
|
|
|
+<li class="toctree-l3"><a class="reference internal" href="../Appendix/Terminology.html#alignment-pattern">Alignment Pattern</a></li>
|
|
|
+<li class="toctree-l3"><a class="reference internal" href="../Appendix/Terminology.html#timing-pattern">Timing Pattern</a></li>
|
|
|
+<li class="toctree-l3"><a class="reference internal" href="../Appendix/Terminology.html#separators">Separators</a></li>
|
|
|
+<li class="toctree-l3"><a class="reference internal" href="../Appendix/Terminology.html#quiet-zone">Quiet Zone</a></li>
|
|
|
+</ul>
|
|
|
+</li>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Appendix/Terminology.html#encoding-region">Encoding Region</a><ul>
|
|
|
+<li class="toctree-l3"><a class="reference internal" href="../Appendix/Terminology.html#data">Data</a></li>
|
|
|
+<li class="toctree-l3"><a class="reference internal" href="../Appendix/Terminology.html#version-information">Version Information</a></li>
|
|
|
+<li class="toctree-l3"><a class="reference internal" href="../Appendix/Terminology.html#format-information">Format Information</a></li>
|
|
|
+<li class="toctree-l3"><a class="reference internal" href="../Appendix/Terminology.html#darkmodule">Darkmodule</a></li>
|
|
|
+</ul>
|
|
|
+</li>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Appendix/Terminology.html#mode">Mode</a><ul>
|
|
|
+<li class="toctree-l3"><a class="reference internal" href="../Appendix/Terminology.html#segment">Segment</a></li>
|
|
|
+<li class="toctree-l3"><a class="reference internal" href="../Appendix/Terminology.html#extended-channel-interpretation-eci">Extended Channel Interpretation (ECI)</a></li>
|
|
|
+<li class="toctree-l3"><a class="reference internal" href="../Appendix/Terminology.html#mixed-mode">Mixed Mode</a></li>
|
|
|
+</ul>
|
|
|
+</li>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Appendix/Terminology.html#ecc-error-correction-coding">ECC (Error Correction Coding)</a><ul>
|
|
|
+<li class="toctree-l3"><a class="reference internal" href="../Appendix/Terminology.html#ecc-level">ECC Level</a></li>
|
|
|
+<li class="toctree-l3"><a class="reference internal" href="../Appendix/Terminology.html#maximum-data-capacity">Maximum data capacity</a></li>
|
|
|
+</ul>
|
|
|
+</li>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Appendix/Terminology.html#data-masking">Data masking</a><ul>
|
|
|
+<li class="toctree-l3"><a class="reference internal" href="../Appendix/Terminology.html#evaluation">Evaluation</a></li>
|
|
|
+<li class="toctree-l3"><a class="reference internal" href="../Appendix/Terminology.html#mask-pattern">Mask pattern</a></li>
|
|
|
+</ul>
|
|
|
+</li>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Appendix/Terminology.html#reflectance">Reflectance</a></li>
|
|
|
+</ul>
|
|
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+</li>
|
|
|
+<li class="toctree-l1"><a class="reference internal" href="../Appendix/URI-Content.html">Popular content and URI schemes</a><ul>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Appendix/URI-Content.html#url-https">URL <code class="docutils literal notranslate"><span class="pre">https</span></code></a></li>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Appendix/URI-Content.html#e-mail-mailto">E-Mail <code class="docutils literal notranslate"><span class="pre">mailto</span></code></a></li>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Appendix/URI-Content.html#phone-numbers-tel">Phone numbers <code class="docutils literal notranslate"><span class="pre">tel</span></code></a></li>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Appendix/URI-Content.html#geo-coordinates-geo">Geo Coordinates <code class="docutils literal notranslate"><span class="pre">geo</span></code></a></li>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Appendix/URI-Content.html#mobile-authenticators-otpauth">Mobile Authenticators <code class="docutils literal notranslate"><span class="pre">otpauth</span></code></a></li>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Appendix/URI-Content.html#wireless-network-configuration">Wireless Network configuration</a></li>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Appendix/URI-Content.html#contact-information-vcard">Contact information: vCard</a></li>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Appendix/URI-Content.html#calendar-events-vcalendar-and-icalendar">Calendar Events: vCalendar and iCalendar</a></li>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Appendix/URI-Content.html#credit-transfer">Credit Transfer</a><ul>
|
|
|
+<li class="toctree-l3"><a class="reference internal" href="../Appendix/URI-Content.html#sepa-european-payments-council">SEPA (European Payments Council)</a></li>
|
|
|
+<li class="toctree-l3"><a class="reference internal" href="../Appendix/URI-Content.html#pix-banco-central-do-brasil">Pix (Banco Central do Brasil)</a></li>
|
|
|
+</ul>
|
|
|
+</li>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Appendix/URI-Content.html#see-also">See also</a></li>
|
|
|
+</ul>
|
|
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+</li>
|
|
|
+<li class="toctree-l1"><a class="reference internal" href="../Appendix/Performance-considerations.html">Performance considerations</a><ul>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Appendix/Performance-considerations.html#version">Version</a></li>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Appendix/Performance-considerations.html#ecc-level">Ecc level</a></li>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Appendix/Performance-considerations.html#data-mode">Data mode</a></li>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Appendix/Performance-considerations.html#mask-pattern">Mask pattern</a></li>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Appendix/Performance-considerations.html#output">Output</a></li>
|
|
|
+</ul>
|
|
|
+</li>
|
|
|
+<li class="toctree-l1"><a class="reference internal" href="../Appendix/Contribute.html">How to contribute</a><ul>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Appendix/Contribute.html#questions-and-issues">Questions and issues</a></li>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Appendix/Contribute.html#bug-reports">Bug reports</a></li>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Appendix/Contribute.html#pull-requests-and-bug-fixes">Pull requests and bug fixes</a></li>
|
|
|
+<li class="toctree-l2"><a class="reference internal" href="../Appendix/Contribute.html#documentation">Documentation</a></li>
|
|
|
+</ul>
|
|
|
+</li>
|
|
|
+<li class="toctree-l1"><a class="reference internal" href="../Appendix/License.html">License</a></li>
|
|
|
+</ul>
|
|
|
+
|
|
|
+ </div>
|
|
|
+ </div>
|
|
|
+ </nav>
|
|
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+
|
|
|
+ <section data-toggle="wy-nav-shift" class="wy-nav-content-wrap"><nav class="wy-nav-top" aria-label="Mobile navigation menu" >
|
|
|
+ <i data-toggle="wy-nav-top" class="fa fa-bars"></i>
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+ <a href="../index.html">PHP-QRCode</a>
|
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+ </nav>
|
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+
|
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+ <div class="wy-nav-content">
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+ <div class="rst-content">
|
|
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+ <div role="navigation" aria-label="Page navigation">
|
|
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+ <ul class="wy-breadcrumbs">
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+ <li><a href="../index.html" class="icon icon-home" aria-label="Home"></a></li>
|
|
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+ <li class="breadcrumb-item active">Reading QR Codes</li>
|
|
|
+ <li class="wy-breadcrumbs-aside">
|
|
|
+ <a href="https://github.com/chillerlan/php-qrcode/blob/main/docs/Usage/Reading-QRCodes.md" class="fa fa-github"> Edit on GitHub</a>
|
|
|
+ </li>
|
|
|
+ </ul>
|
|
|
+ <hr/>
|
|
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+</div>
|
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+ <div role="main" class="document" itemscope="itemscope" itemtype="http://schema.org/Article">
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+ <div itemprop="articleBody">
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+
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+ <section id="reading-qr-codes">
|
|
|
+<h1>Reading QR Codes<a class="headerlink" href="#reading-qr-codes" title="Link to this heading"></a></h1>
|
|
|
+<section id="basic-usage">
|
|
|
+<h2>Basic usage<a class="headerlink" href="#basic-usage" title="Link to this heading"></a></h2>
|
|
|
+<p>The QR Code reader can be called either from a <code class="docutils literal notranslate"><span class="pre">QRCode</span></code> instance or invoked directly via the <code class="docutils literal notranslate"><span class="pre">Decoder</span></code> class with a <code class="docutils literal notranslate"><span class="pre">QROptions</span></code> (<code class="docutils literal notranslate"><span class="pre">QRCodeReaderOptionsTrait</span></code>) instance.</p>
|
|
|
+<div class="highlight-php notranslate"><div class="highlight"><pre><span></span><span class="nv">$options</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">QROptions</span>
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+
|
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+<span class="nv">$options</span><span class="o">-></span><span class="na">readerUseImagickIfAvailable</span> <span class="o">=</span> <span class="k">true</span><span class="p">;</span>
|
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+<span class="nv">$options</span><span class="o">-></span><span class="na">readerIncreaseContrast</span> <span class="o">=</span> <span class="k">true</span><span class="p">;</span>
|
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|
+<span class="nv">$options</span><span class="o">-></span><span class="na">readerGrayscale</span> <span class="o">=</span> <span class="k">true</span><span class="p">;</span>
|
|
|
+<span class="nv">$options</span><span class="o">-></span><span class="na">readerInvertColors</span> <span class="o">=</span> <span class="k">false</span><span class="p">;</span>
|
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+</pre></div>
|
|
|
+</div>
|
|
|
+<p>The option <code class="docutils literal notranslate"><span class="pre">QROptions::$readerUseImagickIfAvailable</span></code> is exclusive to the <code class="docutils literal notranslate"><span class="pre">QRCode</span></code> instance in order to decide which <code class="docutils literal notranslate"><span class="pre">LuminanceSourceInterface</span></code> to use.
|
|
|
+The <code class="docutils literal notranslate"><span class="pre">QRCode</span></code> instance has 3 convenience methods related to the reader:</p>
|
|
|
+<div class="highlight-php notranslate"><div class="highlight"><pre><span></span><span class="nv">$qrcode</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">QRCode</span><span class="p">(</span><span class="nv">$options</span><span class="p">)</span>
|
|
|
+
|
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|
+<span class="nv">$result</span> <span class="o">=</span> <span class="nv">$qrcode</span><span class="o">-></span><span class="na">readFromFile</span><span class="p">(</span><span class="s1">'path/to/qrcode.png'</span><span class="p">);</span>
|
|
|
+<span class="nv">$result</span> <span class="o">=</span> <span class="nv">$qrcode</span><span class="o">-></span><span class="na">readFromBlob</span><span class="p">(</span><span class="nv">$imagedata</span><span class="p">);</span>
|
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+
|
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|
+<span class="c1">// from a luminance source instance</span>
|
|
|
+<span class="nv">$source</span> <span class="o">=</span> <span class="nx">IMagickLuminanceSource</span><span class="o">::</span><span class="na">fromBlob</span><span class="p">(</span><span class="nv">$imagedata</span><span class="p">,</span> <span class="nv">$options</span><span class="p">);</span>
|
|
|
+<span class="nv">$result</span> <span class="o">=</span> <span class="nv">$qrcode</span><span class="o">-></span><span class="na">readFromSource</span><span class="p">(</span><span class="nv">$source</span><span class="p">);</span>
|
|
|
+</pre></div>
|
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|
+</div>
|
|
|
+</section>
|
|
|
+<section id="the-luminancesourceinterface">
|
|
|
+<h2>The <code class="docutils literal notranslate"><span class="pre">LuminanceSourceInterface</span></code><a class="headerlink" href="#the-luminancesourceinterface" title="Link to this heading"></a></h2>
|
|
|
+<p>The method <code class="docutils literal notranslate"><span class="pre">QRCode::readFromSource()</span></code> takes a <code class="docutils literal notranslate"><span class="pre">LuminanceSourceInterface</span></code> instance as parameter and is mainly for internal use, as you can invoke and call the decoder directly with it.
|
|
|
+Each <code class="docutils literal notranslate"><span class="pre">LuminanceSourceInterface</span></code> has the static convenience methods <code class="docutils literal notranslate"><span class="pre">fromFile()</span></code> and <code class="docutils literal notranslate"><span class="pre">fromBlob()</span></code> that will invoke the instance with the respective parameters, alternatively the instance(s) can be invoked manually:</p>
|
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|
+<p>from an <code class="docutils literal notranslate"><span class="pre">Imagick</span></code> instance:</p>
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+<div class="highlight-php notranslate"><div class="highlight"><pre><span></span><span class="nv">$imagick</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">Imagick</span><span class="p">;</span>
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+<span class="nv">$imagick</span><span class="o">-></span><span class="na">readImageBlob</span><span class="p">(</span><span class="nv">$imagedata</span><span class="p">);</span>
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+
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+<span class="nv">$source</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">IMagickLuminanceSource</span><span class="p">(</span><span class="nv">$imagick</span><span class="p">,</span> <span class="nv">$options</span><span class="p">);</span>
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+</pre></div>
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+</div>
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+<p>from a <code class="docutils literal notranslate"><span class="pre">GdImage</span></code> instance:</p>
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+<div class="highlight-php notranslate"><div class="highlight"><pre><span></span><span class="nv">$gdimage</span> <span class="o">=</span> <span class="nb">imagecreatefromstring</span><span class="p">(</span><span class="nv">$imagedata</span><span class="p">);</span>
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+
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+<span class="nv">$source</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">GDLuminanceSource</span><span class="p">(</span><span class="nv">$gdimage</span><span class="p">,</span> <span class="nv">$options</span><span class="p">);</span>
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+</pre></div>
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+</div>
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+</section>
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+<section id="the-decoder">
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+<h2>The <code class="docutils literal notranslate"><span class="pre">Decoder</span></code><a class="headerlink" href="#the-decoder" title="Link to this heading"></a></h2>
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+<p>The <code class="docutils literal notranslate"><span class="pre">Decoder</span></code> takes a <code class="docutils literal notranslate"><span class="pre">QROptions</span></code> instance as parameter, which currently has no use - it is only handed over for possible future uses.</p>
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+<div class="highlight-php notranslate"><div class="highlight"><pre><span></span><span class="nv">$result</span> <span class="o">=</span> <span class="p">(</span><span class="k">new</span> <span class="nx">Decoder</span><span class="p">(</span><span class="nv">$options</span><span class="p">))</span><span class="o">-></span><span class="na">decode</span><span class="p">(</span><span class="nv">$source</span><span class="p">);</span>
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+</pre></div>
|
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+</div>
|
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+<p>That is all! The decoder will either return a <code class="docutils literal notranslate"><span class="pre">DecoderResult</span></code> instance or throw an exception.
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+It is generally a good practice to wrap the reading in a try/catch block:</p>
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+<div class="highlight-php notranslate"><div class="highlight"><pre><span></span><span class="k">try</span><span class="p">{</span>
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+ <span class="nv">$result</span> <span class="o">=</span> <span class="nv">$qrcode</span><span class="o">-></span><span class="na">readFromFile</span><span class="p">(</span><span class="s1">'path/to/file.png'</span><span class="p">);</span> <span class="c1">// -> DecoderResult</span>
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+
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+ <span class="c1">// ... do stuff with the result</span>
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|
|
+<span class="p">}</span>
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+<span class="k">catch</span><span class="p">(</span><span class="nx">QRCodeDecoderException</span><span class="p">){</span>
|
|
|
+ <span class="c1">// ... adjust input image (position, contrast, invert, sharpen) and repeat the process</span>
|
|
|
+<span class="p">}</span>
|
|
|
+</pre></div>
|
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+</div>
|
|
|
+<p>You can now use the result instance:</p>
|
|
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+<div class="highlight-php notranslate"><div class="highlight"><pre><span></span><span class="nv">$content</span> <span class="o">=</span> <span class="nv">$result</span><span class="o">-></span><span class="na">data</span><span class="p">;</span>
|
|
|
+<span class="c1">// ...or simply cast it to string:</span>
|
|
|
+<span class="nv">$content</span> <span class="o">=</span> <span class="p">(</span><span class="nx">string</span><span class="p">)</span><span class="nv">$result</span><span class="p">;</span>
|
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+</pre></div>
|
|
|
+</div>
|
|
|
+<p>The result instance also holds <code class="docutils literal notranslate"><span class="pre">Version</span></code>, <code class="docutils literal notranslate"><span class="pre">EccLevel</span></code>, <code class="docutils literal notranslate"><span class="pre">MaskPattern</span></code> and <code class="docutils literal notranslate"><span class="pre">BitBuffer</span></code> instances, as well as an array of <code class="docutils literal notranslate"><span class="pre">FinderPattern</span></code> instances,
|
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+it also offers a method that returns a <code class="docutils literal notranslate"><span class="pre">QRMatrix</span></code> instance populated with the detected settings:</p>
|
|
|
+<div class="highlight-php notranslate"><div class="highlight"><pre><span></span><span class="nv">$matrix</span> <span class="o">=</span> <span class="nv">$result</span><span class="o">-></span><span class="na">getQRMatrix</span><span class="p">();</span>
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+
|
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|
+<span class="c1">// ...matrix modification...</span>
|
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|
+
|
|
|
+<span class="nv">$output</span> <span class="o">=</span> <span class="p">(</span><span class="k">new</span> <span class="nx">QRCode</span><span class="p">(</span><span class="nv">$options</span><span class="p">))</span><span class="o">-></span><span class="na">renderMatrix</span><span class="p">(</span><span class="nv">$matrix</span><span class="p">);</span>
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+
|
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|
+<span class="c1">// ...dump output</span>
|
|
|
+</pre></div>
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+</div>
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+</section>
|
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+<section id="general-considerations">
|
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|
+<h2>General considerations<a class="headerlink" href="#general-considerations" title="Link to this heading"></a></h2>
|
|
|
+<p>The QR Code reader reads the given QR symbol in a single pass, unlike e.g. a reader app on a mobile device with a camera, which repeats the reading process for a sequence of frames from the video input and takes the “best” result.
|
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|
+It means that this reader may fail to properly decode a symbol that reads perfectly fine on a mobile - you’d need to emulate the same process of sequential reading while adjusting the input image to get a similar result.</p>
|
|
|
+<p>Further it seems (<a class="reference external" href="https://github.com/chillerlan/php-qrcode/blob/92346420a5a88aeeb8dc16f731ef1f93331635d3/tests/QRCodeReaderTestAbstract.php#L168-L172">per observation</a>) that the reader favors smaller module sizes (1-2 pixel side length) from version 20 onwards.
|
|
|
+The test data set seemed to randomly produce errors depending on the given module scale, independent of the luminance source.
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+However, scaling down to get a smaller module size isn’t the best solution as it may produce additional challenges due to filter artifacts.</p>
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+</section>
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+</section>
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+
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+ <p>© Copyright 2025, smiley.</p>
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