mirror of
https://github.com/chillerlan/php-qrcode.git
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smiley
110 lines
2.9 KiB
PHP
110 lines
2.9 KiB
PHP
<?php
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/**
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* example for additional text
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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 PhpComposerExtensionStubsInspection
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*/
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use chillerlan\QRCode\{QRCode, QROptions};
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use chillerlan\QRCode\Output\QRImage;
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require_once __DIR__.'/../vendor/autoload.php';
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class QRImageWithText extends QRImage{
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/**
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* @param string|null $file
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* @param string|null $text
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*
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* @return string
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*/
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public function dump(?string $file = null, ?string $text = null):string{
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// set returnResource to true to skip further processing for now
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$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 = $this->dumpImage();
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if($file !== null){
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$this->saveToFile($imageData, $file);
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}
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if($this->options->imageBase64){
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$imageData = 'data:image/'.$this->options->outputType.';base64,'.base64_encode($imageData);
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}
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return $imageData;
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}
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/**
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* @param string $text
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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($this->options->imageTransparent && in_array($this->options->outputType, $this::TRANSPARENCY_TYPES, true)){
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imagecolortransparent($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, $this->length, 100);
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imagedestroy($qrcode);
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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, $fontColor);
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}
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}
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}
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$options = new QROptions([
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'version' => 7,
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'outputType' => QRCode::OUTPUT_IMAGE_PNG,
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'scale' => 3,
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'imageBase64' => false,
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]);
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header('Content-type: image/png');
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$qrOutputInterface = new QRImageWithText($options, (new QRCode($options))->getMatrix('https://www.youtube.com/watch?v=dQw4w9WgXcQ'));
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// dump the output, with additional text
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echo $qrOutputInterface->dump(null, 'example text');
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