Generate two-dimensional code using PHP class library Phpqrcode

This article mainly introduces the use of PHP class library Phpqrcode generation of two-dimensional code, has a certain reference value, now share to everyone, the need for friends can refer to

Phpqrcode is a php QR code generation Library, using it can easily generate two-dimensional code, the official website provides a download and a number of demo demo,

After downloading the class library provided by the official website, we only need to use phpqrcode.php to generate the QR code, of course, your PHP environment must turn on support GD2. Phpqrcode.php provides a key PNG () method, where the parameter $text represents the generation of two-bit information text, the parameter $outfile indicates whether to output a QR code picture file, the default is no, the parameter $level indicates fault tolerance, that is, the covered area can be recognized, respectively L (qr_eclevel_l,7%), M (qr_eclevel_m,15%), Q (qr_eclevel_q,25%), H (qr_eclevel_h,30%), parameter $size indicates the image size is generated, default is 3; Margin indicates the spacing value of the border space around the QR code, and the parameter $saveandprint indicates whether to save the QR code and display it.

PHP QRCode is very simple to call, the following code can generate a "http://www.learnphp.cn" of the QR code.

PHP code

Include ' phpqrcode.php ';   QRCode::p ng (' http://www.php.cn ');

In the actual application, we will add their own logo in the middle of the two-dimensional code, has enhanced the publicity effect. How do you generate a QR code that contains a logo? In fact, the principle is very simple, first use PHP QR code to generate a two-dimensional code image, and then the use of PHP image correlation function, the pre-prepared logo image is added to the newly generated image of the original two-dimensional code, and then regenerate a new QR code image.

<?php include ' phpqrcode.php '; $value = ' http://www.php.cn '; QR Code content $errorCorrectionLevel = ' L ';//fault tolerance level $matrixPointSize = 6;//Generate picture size//generate QR code picture qrcode::p ng ($value, ' qrcode.png ', $ Errorcorrectionlevel, $matrixPointSize, 2); $logo = ' logo.png ';///Ready logo image $QR = ' qrcode.png ';//The original two-dimensional code graph that has been generated if ($logo!== FALSE) {$QR = imagecreatefromstring (file _get_contents ($QR)); $logo = imagecreatefromstring (file_get_contents ($logo)); $QR _width = Imagesx ($QR);//QR code image width $QR _height = Imagesy ($QR);//QR code image height $logo _width = imagesx ($logo);//logo Picture Width $logo _ Height = Imagesy ($logo);//logo picture height $logo _qr_width = $QR _width/5; $scale = $logo _width/$logo _qr_width; $logo _qr_height = $logo _height/$scale; $from _width = ($QR _width-$logo _qr_width)/2; Regroup pictures and resize imagecopyresampled ($QR, $logo, $from _width, $from _width, 0, 0, $logo _qr_width, $logo _qr_height, $logo _ width, $logo _height); }//Output picture imagepng ($QR, ' helloweba.png '); Echo '  ';?>

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