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- # `QROutputInterface`
- The full phpDocumentor API documentation can be found at [chillerlan.github.io/php-qrcode](https://chillerlan.github.io/php-qrcode/classes/chillerlan-QRCode-Output-QROutputInterface.html).
- ## Methods
- | method | return | description |
- |---------------------------------------|---------|---------------------------------------------------------------------|
- | (static) `moduleValueIsValid($value)` | `bool` | Determines whether the given value is valid |
- | `dump(string $file = null)` | `mixed` | Generates the output, optionally dumps it to a file, and returns it |
- ## Constants
- | name | description |
- |-------------------------|----------------------------------------------------|
- | `MARKUP_HTML` | |
- | `MARKUP_SVG` | |
- | `GDIMAGE_PNG` | |
- | `GDIMAGE_JPG` | |
- | `GDIMAGE_GIF` | |
- | `STRING_JSON` | |
- | `STRING_TEXT` | |
- | `IMAGICK` | |
- | `FPDF` | |
- | `EPS` | |
- | `CUSTOM` | |
- | `MODES` | Map of built-in output modes => class FQN |
- | `DEFAULT_MODULE_VALUES` | Map of module type => default value |
- | `LAYERNAMES` | Map of module type => readable name (for CSS etc.) |
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