mrkad
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php-qrcode
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<li class="toctree-l2"><a class="reference internal" href="Usage-Quickstart.html#reading-qr-codes">Reading QR Codes</a></li>
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<li class="toctree-l1 current"><a class="current reference internal" href="#">Advanced usage</a><ul>
<li class="toctree-l2"><a class="reference internal" href="#configuration-via-qroptions">Configuration via <code class="docutils literal notranslate"><span class="pre">QROptions</span></code></a><ul>
<li class="toctree-l3"><a class="reference internal" href="#supply-an-iterable-of-options">Supply an <code class="docutils literal notranslate"><span class="pre">iterable</span></code> of options</a></li>
<li class="toctree-l3"><a class="reference internal" href="#load-and-save-json">Load and save JSON</a></li>
<li class="toctree-l3"><a class="reference internal" href="#extending-the-qroptions-class">Extending the <code class="docutils literal notranslate"><span class="pre">QROptions</span></code> class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#qrcode-methods"><code class="docutils literal notranslate"><span class="pre">QRCode</span></code> methods</a><ul>
<li class="toctree-l3"><a class="reference internal" href="#save-to-file">Save to file</a></li>
<li class="toctree-l3"><a class="reference internal" href="#render-a-qrmatrix-instance">Render a <code class="docutils literal notranslate"><span class="pre">QRMatrix</span></code> instance</a></li>
<li class="toctree-l3"><a class="reference internal" href="#mixed-mode">Mixed mode</a></li>
<li class="toctree-l3"><a class="reference internal" href="#qr-code-reader">QR Code reader</a></li>
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  <section id="advanced-usage">
<h1>Advanced usage<a class="headerlink" href="#advanced-usage" title="Permalink to this heading"></a></h1>
<section id="configuration-via-qroptions">
<h2>Configuration via <code class="docutils literal notranslate"><span class="pre">QROptions</span></code><a class="headerlink" href="#configuration-via-qroptions" title="Permalink to this heading"></a></h2>
<p>The <a class="reference external" href="https://github.com/chillerlan/php-qrcode/blob/main/src/QROptions.php"><code class="docutils literal notranslate"><span class="pre">QROptions</span></code></a> class is a container based on <a class="reference external" href="https://github.com/chillerlan/php-settings-container">chillerlan/php-settings-container</a> that behaves similar to a <a class="reference external" href="https://www.php.net/manual/class.stdclass"><code class="docutils literal notranslate"><span class="pre">\stdClass</span></code></a> object, but with fixed properties.</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><span class="p">;</span>

<span class="c1">// set some values</span>
<span class="nv">$options</span><span class="o">-&gt;</span><span class="na">version</span> <span class="o">=</span> <span class="mi">7</span><span class="p">;</span>     <span class="c1">// property &quot;version&quot; exists</span>
<span class="nv">$options</span><span class="o">-&gt;</span><span class="na">foo</span>     <span class="o">=</span> <span class="s1">&#39;bar&#39;</span><span class="p">;</span> <span class="c1">// property &quot;foo&quot; does not exist (and will not be created)</span>

<span class="c1">// retrieve values</span>
<span class="nb">var_dump</span><span class="p">(</span><span class="nv">$options</span><span class="o">-&gt;</span><span class="na">version</span><span class="p">);</span> <span class="c1">// -&gt; 7</span>
<span class="nb">var_dump</span><span class="p">(</span><span class="nv">$options</span><span class="o">-&gt;</span><span class="na">foo</span><span class="p">);</span>     <span class="c1">// -&gt; null (no error will be thrown)</span>
</pre></div>
</div>
<section id="supply-an-iterable-of-options">
<h3>Supply an <code class="docutils literal notranslate"><span class="pre">iterable</span></code> of options<a class="headerlink" href="#supply-an-iterable-of-options" title="Permalink to this heading"></a></h3>
<p>The constructor takes an <code class="docutils literal notranslate"><span class="pre">iterable</span></code> of <code class="docutils literal notranslate"><span class="pre">$key</span> <span class="pre">=&gt;</span> <span class="pre">$value</span></code> pairs. For each setting an optional setter will be called if present.</p>
<div class="highlight-php notranslate"><div class="highlight"><pre><span></span><span class="nv">$myOptions</span> <span class="o">=</span> <span class="p">[</span>
	<span class="s1">&#39;version&#39;</span>    <span class="o">=&gt;</span> <span class="mi">5</span><span class="p">,</span>
	<span class="s1">&#39;outputType&#39;</span> <span class="o">=&gt;</span> <span class="nx">QROutputInterface</span><span class="o">::</span><span class="na">GDIMAGE_PNG</span><span class="p">,</span>
	<span class="s1">&#39;eccLevel&#39;</span>   <span class="o">=&gt;</span> <span class="nx">EccLevel</span><span class="o">::</span><span class="na">M</span><span class="p">,</span>
<span class="p">];</span>

<span class="nv">$options</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">QROptions</span><span class="p">(</span><span class="nv">$myOptions</span><span class="p">);</span>
</pre></div>
</div>
<p>You can also set an <code class="docutils literal notranslate"><span class="pre">iterable</span></code> of options on an existing QROptions instance:</p>
<div class="highlight-php notranslate"><div class="highlight"><pre><span></span><span class="nv">$options</span><span class="o">-&gt;</span><span class="na">fromIterable</span><span class="p">(</span><span class="nv">$myOptions</span><span class="p">);</span>
</pre></div>
</div>
</section>
<section id="load-and-save-json">
<h3>Load and save JSON<a class="headerlink" href="#load-and-save-json" title="Permalink to this heading"></a></h3>
<p>The settings can be saved to and loaded from JSON, e.g. to store them in a database:</p>
<div class="highlight-php notranslate"><div class="highlight"><pre><span></span><span class="nv">$json</span> <span class="o">=</span> <span class="nv">$options</span><span class="o">-&gt;</span><span class="na">toJSON</span><span class="p">(</span><span class="nx">JSON_THROW_ON_ERROR</span><span class="p">);</span>
<span class="c1">// via JsonSerializable interface</span>
<span class="nv">$json</span> <span class="o">=</span> <span class="nb">json_encode</span><span class="p">(</span><span class="nv">$options</span><span class="p">,</span> <span class="nx">JSON_THROW_ON_ERROR</span><span class="p">);</span>
<span class="c1">// via __toString()</span>
<span class="nv">$json</span> <span class="o">=</span> <span class="p">(</span><span class="nx">string</span><span class="p">)</span><span class="nv">$options</span><span class="p">;</span>

<span class="nv">$options</span> <span class="o">=</span> <span class="p">(</span><span class="k">new</span> <span class="nx">QROptions</span><span class="p">)</span><span class="o">-&gt;</span><span class="na">fromJSON</span><span class="p">(</span><span class="nv">$json</span><span class="p">);</span>
<span class="c1">// on an existing instance - properties will be overwriten</span>
<span class="nv">$options</span><span class="o">-&gt;</span><span class="na">fromJSON</span><span class="p">(</span><span class="nv">$json</span><span class="p">);</span>
</pre></div>
</div>
</section>
<section id="extending-the-qroptions-class">
<h3>Extending the <code class="docutils literal notranslate"><span class="pre">QROptions</span></code> class<a class="headerlink" href="#extending-the-qroptions-class" title="Permalink to this heading"></a></h3>
<p>In case you need additional settings for your output module, just extend <code class="docutils literal notranslate"><span class="pre">QROptions</span></code>…</p>
<div class="highlight-php notranslate"><div class="highlight"><pre><span></span><span class="k">class</span> <span class="nc">MyCustomOptions</span> <span class="k">extends</span> <span class="nx">QROptions</span><span class="p">{</span>
	<span class="k">protected</span> <span class="nx">string</span> <span class="nv">$myParam</span> <span class="o">=</span> <span class="s1">&#39;defaultValue&#39;</span><span class="p">;</span>
	<span class="c1">// ...</span>
<span class="p">}</span>
</pre></div>
</div>
<p>…or use the <a class="reference external" href="https://github.com/chillerlan/php-settings-container/blob/main/src/SettingsContainerInterface.php"><code class="docutils literal notranslate"><span class="pre">SettingsContainerInterface</span></code></a>, which is the more flexible approach.</p>
<div class="highlight-php notranslate"><div class="highlight"><pre><span></span><span class="k">trait</span> <span class="nx">MyCustomOptionsTrait</span><span class="p">{</span>
	<span class="k">protected</span> <span class="nx">string</span> <span class="nv">$myParam</span> <span class="o">=</span> <span class="s1">&#39;defaultValue&#39;</span><span class="p">;</span>
	<span class="c1">// ...</span>

	<span class="c1">// an optional magic setter, named &quot;set_&quot; + property name</span>
	<span class="k">protected</span> <span class="k">function</span> <span class="nf">set_myParam</span><span class="p">(</span><span class="nx">string</span> <span class="nv">$myParam</span><span class="p">)</span><span class="o">:</span><span class="nx">void</span><span class="p">{</span>
		<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">myParam</span> <span class="o">=</span> <span class="nb">trim</span><span class="p">(</span><span class="nv">$myParam</span><span class="p">);</span>
	<span class="p">}</span>

	<span class="c1">// an optional magic getter, named &quot;get_&quot; + property name</span>
	<span class="k">protected</span> <span class="k">function</span> <span class="nf">get_myParam</span><span class="p">()</span><span class="o">:</span><span class="nx">string</span><span class="p">{</span>
		<span class="k">return</span> <span class="nb">strtoupper</span><span class="p">(</span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">myParam</span><span class="p">);</span>
	<span class="p">}</span>
<span class="p">}</span>

<span class="k">class</span> <span class="nc">MyCustomOptions</span> <span class="k">extends</span> <span class="nx">SettingsContainerAbstract</span><span class="p">{</span>
	<span class="k">use</span> <span class="nx">QROptionsTrait</span><span class="p">,</span> <span class="nx">MyCustomOptionsTrait</span><span class="p">;</span>
<span class="p">}</span>

<span class="c1">// set the options</span>
<span class="nv">$myCustomOptions</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">MyCustomOptions</span><span class="p">;</span>
<span class="nv">$myCustomOptions</span><span class="o">-&gt;</span><span class="na">myParam</span> <span class="o">=</span> <span class="s1">&#39;whatever value&#39;</span><span class="p">;</span>
</pre></div>
</div>
<p>Extend the <code class="docutils literal notranslate"><span class="pre">SettingsContainerInterface</span></code> on-the-fly:</p>
<div class="highlight-php notranslate"><div class="highlight"><pre><span></span><span class="nv">$myOptions</span> <span class="o">=</span> <span class="p">[</span>
	<span class="s1">&#39;myParam&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;whatever value&#39;</span><span class="p">,</span>
	<span class="c1">// ...</span>
<span class="p">];</span>

<span class="nv">$myCustomOptions</span> <span class="o">=</span> <span class="k">new</span> <span class="k">class</span><span class="p">(</span><span class="nv">$myOptions</span><span class="p">)</span> <span class="k">extends</span> <span class="nx">SettingsContainerAbstract</span><span class="p">{</span>
	<span class="k">use</span> <span class="nx">QROptionsTrait</span><span class="p">,</span> <span class="nx">MyCustomOptionsTrait</span><span class="p">;</span>
<span class="p">};</span>
</pre></div>
</div>
</section>
</section>
<section id="qrcode-methods">
<h2><code class="docutils literal notranslate"><span class="pre">QRCode</span></code> methods<a class="headerlink" href="#qrcode-methods" title="Permalink to this heading"></a></h2>
<p>Aside of invoking a <code class="docutils literal notranslate"><span class="pre">QRCode</span></code> instance with an optional <code class="docutils literal notranslate"><span class="pre">QROptions</span></code> object as parameter, you can also set the options instance after invocation.
After invocation of the <code class="docutils literal notranslate"><span class="pre">QROptions</span></code> instance, values can be set without calling <code class="docutils literal notranslate"><span class="pre">QRCode::setOptions()</span></code> again (instance is backreferenced), however, this may create side effects.</p>
<div class="highlight-php notranslate"><div class="highlight"><pre><span></span><span class="c1">// instance will be invoked with default settings</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="c1">// set options after QRCode invocation</span>
<span class="nv">$options</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">QROptions</span><span class="p">;</span>

<span class="nv">$qrcode</span><span class="o">-&gt;</span><span class="na">setOptions</span><span class="p">(</span><span class="nv">$options</span><span class="p">);</span>
</pre></div>
</div>
<section id="save-to-file">
<h3>Save to file<a class="headerlink" href="#save-to-file" title="Permalink to this heading"></a></h3>
<p>Save the QR Code output to <code class="docutils literal notranslate"><span class="pre">/path/to/qrcode.svg</span></code>:</p>
<div class="highlight-php notranslate"><div class="highlight"><pre><span></span><span class="nv">$options</span><span class="o">-&gt;</span><span class="na">imageBase64</span> <span class="o">=</span> <span class="k">false</span><span class="p">;</span>
<span class="nv">$options</span><span class="o">-&gt;</span><span class="na">cachefile</span>   <span class="o">=</span> <span class="s1">&#39;/path/to/qrcode.svg&#39;</span><span class="p">;</span>

<span class="nv">$qrcode</span><span class="o">-&gt;</span><span class="na">render</span><span class="p">(</span><span class="nv">$data</span><span class="p">);</span>
</pre></div>
</div>
<p>Alternatively, you can specify an output path, which will override the <code class="docutils literal notranslate"><span class="pre">QROptions::$cachefile</span></code> setting:</p>
<div class="highlight-php notranslate"><div class="highlight"><pre><span></span><span class="nv">$qrcode</span><span class="o">-&gt;</span><span class="na">render</span><span class="p">(</span><span class="nv">$data</span><span class="p">,</span> <span class="s1">&#39;/other/path/to/qrcode.svg&#39;</span><span class="p">);</span>

<span class="nb">printf</span><span class="p">(</span><span class="s1">&#39;&lt;img src=&quot;%s&quot; alt=&quot;QR Code&quot; /&gt;&#39;</span><span class="p">,</span> <span class="s1">&#39;/other/path/to/qrcode.svg&#39;</span><span class="p">);</span>
</pre></div>
</div>
</section>
<section id="render-a-qrmatrix-instance">
<h3>Render a <code class="docutils literal notranslate"><span class="pre">QRMatrix</span></code> instance<a class="headerlink" href="#render-a-qrmatrix-instance" title="Permalink to this heading"></a></h3>
<p>You can render a <a class="reference external" href="https://github.com/chillerlan/php-qrcode/blob/main/src/Data/QRMatrix.php"><code class="docutils literal notranslate"><span class="pre">QRMatrix</span></code></a> instance directly:</p>
<div class="highlight-php notranslate"><div class="highlight"><pre><span></span><span class="c1">// a matrix from the current data segments</span>
<span class="nv">$matrix</span> <span class="o">=</span> <span class="nv">$qrcode</span><span class="o">-&gt;</span><span class="na">getQRMatrix</span><span class="p">();</span>
<span class="c1">// from the QR Code reader</span>
<span class="nv">$matrix</span> <span class="o">=</span> <span class="nv">$readerResult</span><span class="o">-&gt;</span><span class="na">getQRMatrix</span><span class="p">();</span>
<span class="c1">// manually invoked</span>
<span class="nv">$matrix</span> <span class="o">=</span> <span class="p">(</span><span class="k">new</span> <span class="nx">QRMatrix</span><span class="p">(</span><span class="k">new</span> <span class="nx">Version</span><span class="p">(</span><span class="mi">7</span><span class="p">),</span> <span class="k">new</span> <span class="nx">EccLevel</span><span class="p">(</span><span class="nx">EccLevel</span><span class="o">::</span><span class="na">M</span><span class="p">)))</span><span class="o">-&gt;</span><span class="na">initFunctionalPatterns</span><span class="p">();</span>

<span class="nv">$output</span> <span class="o">=</span> <span class="nv">$qrcode</span><span class="o">-&gt;</span><span class="na">renderMatrix</span><span class="p">(</span><span class="nv">$matrix</span><span class="p">);</span>
<span class="c1">// save to file</span>
<span class="nv">$qrcode</span><span class="o">-&gt;</span><span class="na">renderMatrix</span><span class="p">(</span><span class="nv">$matrix</span><span class="p">,</span> <span class="s1">&#39;/path/to/qrcode.svg&#39;</span><span class="p">);</span>
</pre></div>
</div>
<p>Manual invocation of a <code class="docutils literal notranslate"><span class="pre">QROutputInterface</span></code> to render a <code class="docutils literal notranslate"><span class="pre">QRMatrix</span></code> instance:</p>
<div class="highlight-php notranslate"><div class="highlight"><pre><span></span><span class="k">class</span> <span class="nc">MyCustomOutput</span> <span class="k">extends</span> <span class="nx">QRMarkupSVG</span><span class="p">{</span>
	<span class="c1">// ...</span>
<span class="p">}</span>

<span class="nv">$qrOutputInterface</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">MyCustomOutput</span><span class="p">(</span><span class="nv">$options</span><span class="p">,</span> <span class="nv">$matrix</span><span class="p">);</span>

<span class="nv">$output</span> <span class="o">=</span> <span class="nv">$qrOutputInterface</span><span class="o">-&gt;</span><span class="na">dump</span><span class="p">()</span>
<span class="c1">// render to file</span>
<span class="nv">$qrOutputInterface</span><span class="o">-&gt;</span><span class="na">dump</span><span class="p">(</span><span class="s1">&#39;/path/to/qrcode.svg&#39;</span><span class="p">);</span>
</pre></div>
</div>
</section>
<section id="mixed-mode">
<h3>Mixed mode<a class="headerlink" href="#mixed-mode" title="Permalink to this heading"></a></h3>
<p>Mixed mode QR Codes can be generated by adding several data segments:</p>
<div class="highlight-php notranslate"><div class="highlight"><pre><span></span><span class="c1">// make sure to set a proper internal encoding character set</span>
<span class="c1">// ideally, this should be set in php.ini internal_encoding,</span>
<span class="c1">// default_charset or mbstring.internal_encoding</span>
<span class="nb">mb_internal_encoding</span><span class="p">(</span><span class="s1">&#39;UTF-8&#39;</span><span class="p">);</span>

<span class="c1">// clear any existing data segments</span>
<span class="nv">$qrcode</span><span class="o">-&gt;</span><span class="na">clearSegments</span><span class="p">();</span>

<span class="nv">$qrcode</span>
	<span class="o">-&gt;</span><span class="na">addNumericSegment</span><span class="p">(</span><span class="nv">$numericData</span><span class="p">)</span>
	<span class="o">-&gt;</span><span class="na">addAlphaNumSegment</span><span class="p">(</span><span class="nv">$alphaNumData</span><span class="p">)</span>
	<span class="o">-&gt;</span><span class="na">addKanjiSegment</span><span class="p">(</span><span class="nv">$kanjiData</span><span class="p">)</span>
	<span class="o">-&gt;</span><span class="na">addHanziSegment</span><span class="p">(</span><span class="nv">$hanziData</span><span class="p">)</span>
	<span class="o">-&gt;</span><span class="na">addByteSegment</span><span class="p">(</span><span class="nv">$binaryData</span><span class="p">)</span>
	<span class="o">-&gt;</span><span class="na">addEciSegment</span><span class="p">(</span><span class="nx">ECICharset</span><span class="o">::</span><span class="na">GB18030</span><span class="p">,</span> <span class="nv">$encodedEciData</span><span class="p">)</span>
<span class="p">;</span>

<span class="nv">$output</span> <span class="o">=</span> <span class="nv">$qrcode</span><span class="o">-&gt;</span><span class="na">render</span><span class="p">();</span>
<span class="c1">// render to file</span>
<span class="nv">$qrcode</span><span class="o">-&gt;</span><span class="na">render</span><span class="p">(</span><span class="k">null</span><span class="p">,</span> <span class="s1">&#39;/path/to/qrcode.svg&#39;</span><span class="p">);</span>
</pre></div>
</div>
<p>The <a class="reference external" href="https://github.com/chillerlan/php-qrcode/blob/main/src/Data/QRDataModeInterface.php"><code class="docutils literal notranslate"><span class="pre">QRDataModeInterface</span></code></a> offers the <code class="docutils literal notranslate"><span class="pre">validateString()</span></code> method (implemended for <code class="docutils literal notranslate"><span class="pre">AlphaNum</span></code>, <code class="docutils literal notranslate"><span class="pre">Byte</span></code>, <code class="docutils literal notranslate"><span class="pre">Hanzi</span></code>, <code class="docutils literal notranslate"><span class="pre">Kanji</span></code> and <code class="docutils literal notranslate"><span class="pre">Number</span></code>).
This method is used internally when a data mode is invoked, but it can come in handy if you need to check input data beforehand.</p>
<div class="highlight-php notranslate"><div class="highlight"><pre><span></span><span class="k">if</span><span class="p">(</span><span class="o">!</span><span class="nx">Hanzi</span><span class="o">::</span><span class="na">validateString</span><span class="p">(</span><span class="nv">$data</span><span class="p">)){</span>
	<span class="k">throw</span> <span class="k">new</span> <span class="nx">Exception</span><span class="p">(</span><span class="s1">&#39;invalid GB2312 data&#39;</span><span class="p">);</span>
<span class="p">}</span>

<span class="nv">$qrcode</span><span class="o">-&gt;</span><span class="na">addHanziSegment</span><span class="p">(</span><span class="nv">$data</span><span class="p">);</span>
</pre></div>
</div>
</section>
<section id="qr-code-reader">
<h3>QR Code reader<a class="headerlink" href="#qr-code-reader" title="Permalink to this heading"></a></h3>
<p>In some cases it might be necessary to increase the contrast of a QR Code image:</p>
<div class="highlight-php notranslate"><div class="highlight"><pre><span></span><span class="nv">$options</span><span class="o">-&gt;</span><span class="na">readerUseImagickIfAvailable</span> <span class="o">=</span> <span class="k">true</span><span class="p">;</span>
<span class="nv">$options</span><span class="o">-&gt;</span><span class="na">readerIncreaseContrast</span>      <span class="o">=</span> <span class="k">true</span><span class="p">;</span>
<span class="nv">$options</span><span class="o">-&gt;</span><span class="na">readerGrayscale</span>             <span class="o">=</span> <span class="k">true</span><span class="p">;</span>

<span class="nv">$result</span> <span class="o">=</span> <span class="p">(</span><span class="k">new</span> <span class="nx">QRCode</span><span class="p">(</span><span class="nv">$options</span><span class="p">))</span><span class="o">-&gt;</span><span class="na">readFromFile</span><span class="p">(</span><span class="s1">&#39;path/to/qrcode.png&#39;</span><span class="p">);</span>
</pre></div>
</div>
<p>The <code class="docutils literal notranslate"><span class="pre">QRMatrix</span></code> object from the <a class="reference external" href="https://github.com/chillerlan/php-qrcode/blob/main/src/Decoder/DecoderResult.php"><code class="docutils literal notranslate"><span class="pre">DecoderResult</span></code></a> can be reused:</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">-&gt;</span><span class="na">getQRMatrix</span><span class="p">();</span>

<span class="c1">// ...matrix modification...</span>

<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">-&gt;</span><span class="na">renderMatrix</span><span class="p">(</span><span class="nv">$matrix</span><span class="p">);</span>

<span class="c1">// ...output</span>
</pre></div>
</div>
</section>
</section>
</section>


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