mirror of
https://github.com/chillerlan/php-qrcode.git
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smiley
117 lines
2.9 KiB
PHP
117 lines
2.9 KiB
PHP
<?php
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/**
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* GdImage example for displaying additional text under the QR Code
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*
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* @link https://github.com/chillerlan/php-qrcode/issues/35
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*
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* @created 22.06.2019
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* @author Smiley <smiley@chillerlan.net>
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* @copyright 2019 Smiley
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* @license MIT
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*
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* @noinspection PhpIllegalPsrClassPathInspection, PhpComposerExtensionStubsInspection
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*/
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declare(strict_types=1);
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use chillerlan\QRCode\{QRCode, QROptions};
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use chillerlan\QRCode\Output\QRGdImagePNG;
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require_once __DIR__.'/../vendor/autoload.php';
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/*
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* Class definition
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*/
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class QRImageWithText extends QRGdImagePNG{
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public function dump(string|null $file = null, string|null $text = null):string{
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// set returnResource to true to skip further processing for now
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$this->options->returnResource = true;
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// there's no need to save the result of dump() into $this->image here
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parent::dump($file);
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// render text output if a string is given
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if($text !== null){
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$this->addText($text);
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}
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$imageData = $this->dumpImage();
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$this->saveToFile($imageData, $file);
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if($this->options->outputBase64){
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$imageData = $this->toBase64DataURI($imageData);
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}
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return $imageData;
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}
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protected function addText(string $text):void{
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// save the qrcode image
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$qrcode = $this->image;
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// options things
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$textSize = 3; // see imagefontheight() and imagefontwidth()
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$textBG = [200, 200, 200];
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$textColor = [50, 50, 50];
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$bgWidth = $this->length;
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$bgHeight = ($bgWidth + 20); // 20px extra space
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// create a new image with additional space
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$this->image = imagecreatetruecolor($bgWidth, $bgHeight);
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$background = imagecolorallocate($this->image, ...$textBG);
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// allow transparency
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if($this->options->imageTransparent){
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imagecolortransparent($this->image, $background);
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}
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// fill the background
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imagefilledrectangle($this->image, 0, 0, $bgWidth, $bgHeight, $background);
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// copy over the qrcode
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imagecopymerge($this->image, $qrcode, 0, 0, 0, 0, $this->length, $this->length, 100);
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$fontColor = imagecolorallocate($this->image, ...$textColor);
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$w = imagefontwidth($textSize);
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$x = round(($bgWidth - strlen($text) * $w) / 2);
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// loop through the string and draw the letters
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foreach(str_split($text) as $i => $chr){
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imagechar($this->image, $textSize, (int)($i * $w + $x), $this->length, $chr, $fontColor);
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}
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}
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}
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/*
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* Runtime
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*/
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$options = new QROptions;
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$options->version = 7;
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$options->scale = 3;
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$options->outputBase64 = false;
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$qrcode = new QRCode($options);
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$qrcode->addByteSegment('https://www.youtube.com/watch?v=dQw4w9WgXcQ');
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// invoke the custom output interface manually
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$qrOutputInterface = new QRImageWithText($options, $qrcode->getQRMatrix());
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// dump the output, with additional text
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// the text could also be supplied via the options, see the svgWithLogo example
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$out = $qrOutputInterface->dump(null, 'example text');
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header('Content-type: image/png');
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echo $out;
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exit;
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