A method of generating two-dimensional code for Phpqrcode class

Using the PHP language to generate two-dimensional code, or very difficult, of course, the call to generate a two-dimensional code image of the interface except, if you write code generation, really do not. However, we can use Phpqrcode this ready-made class file, PHP QR code to generate the class library, using it can easily generate two-dimensional code.

Pre-Preparation:

1.phpqrcode class file download, download address: https://sourceforge.net/projects/phpqrcode/
2.PHP environment must be enabled to support GD2 expansion Library (normally open state)

Method Interpretation:

The downloaded class file is a compressed package that contains a lot of files and demo programs, we only need the inside of the phpqrcode.php this file can generate two-dimensional code. It is a collection of multiple classes, and we need to use the PNG () method (line No. 3090) of the QRCode class (line No. 2963) Inside:

public static function png ($text, $outfile = False, $level = qr_eclevel_l, $size = 3, $margin = 4, $saveandprint =false) {
   $enc = Qrencode::factory ($level, $size, $margin);  Return $enc->encodepng ($text, $outfile, $saveandprint =false);}

The 1th parameter $text: The content that the QR code contains, can be link, text, JSON string and so on;
The 2nd parameter $outfile: The default is False, do not generate files, only the two-dimensional code image return output;
The 3rd parameter $level: The default is L, which can pass values of L (qr_eclevel_l,7%), M (qr_eclevel_m,15%), Q (qr_eclevel_q,25%), H (qr_eclevel_ h,30%), this parameter control the two-dimensional code fault tolerance, the different parameters of the two-dimensional code can be covered by the percentage of the area, that is covered by the area can also be identified;
The 4th parameter $size: Control the size of the generated picture, the default is 4;
The 5th parameter $margin: Control the size of the blank area of the generated QR code;
The 6th parameter $saveandprint: Save the two-dimensional code picture and display it, $outfile must pass the picture path;

Examples of Use:

1. Generate two-dimensional code (generate picture file)

1. Generate the original QR code (generate picture file) function Scerweima ($url = ") {  require_once ' phpqrcode.php ';  $value = $url;         Two-dimensional code content  $errorCorrectionLevel = ' L ';  Fault tolerance level  $matrixPointSize = 5;      Generate picture size  //Generate two-dimensional code picture  $filename = ' qrcode/'. Microtime (). PNG ';  QRCode::p ng ($value, $filename, $errorCorrectionLevel, $matrixPointSize, 2);  $QR = $filename;        The original two-dimensional code image file that has been generated  $QR = imagecreatefromstring (file_get_contents ($QR));  Output Image  Imagepng ($QR, ' qrcode.png ');  Imagedestroy ($QR);  Return ' 
2. Add logo to generated QR code (create image file)



2.  Add logo (generate picture file) function scerweima1 ($url = ") {require_once ' phpqrcode.php ') in the generated QR code;         $value = $url;  Two-dimensional code content $errorCorrectionLevel = ' H ';      Fault tolerance level $matrixPointSize = 6; Generate picture size//Generate two-dimensional code picture $filename = ' qrcode/'. Microtime ().  PNG ';  QRCode::p ng ($value, $filename, $errorCorrectionLevel, $matrixPointSize, 2); $logo = ' qrcode/logo.jpg ';      Ready logo image $QR = $filename;    The original two-dimensional code map that has been generated if (file_exists ($logo)) {$QR = Imagecreatefromstring (file_get_contents ($QR));    Target Image connection resource.  $logo = imagecreatefromstring (file_get_contents ($logo));    Source Image Connection resource.      $QR _width = Imagesx ($QR);     Two-dimensional code picture width $QR _height = Imagesy ($QR);    Two-dimensional code image height $logo _width = imagesx ($logo);   Logo image width $logo _height = Imagesy ($logo);   Logo image Height $logo _qr_width = $QR _WIDTH/4;  The width of the logo after the combination (1/5 of the QR code) $scale = $logo _width/$logo _qr_width; The width scaling ratio of the logo (width/width after itself) $logo _qr_height = $logo _height/$scale;  The height of the logo after the combination $from _width = ($QR _width-$logo _qr_width)/2; After combination LoGo to the upper left corner coordinate point//regroup the picture and resize/* * imagecopyresampled () copies a square area of an image (source image) into another image */imagecopyresampled ($QR  , $logo, $from _width, $from _width, 0, 0, $logo _qr_width, $logo _qr_height, $logo _width, $logo _height);  }//Output picture imagepng ($QR, ' qrcode.png ');  Imagedestroy ($QR);  Imagedestroy ($logo); Return ' 
3. Generate QR code (no image file generated)



3. Generates the original QR code (does not generate a picture file) function scerweima2 ($url = ") {  require_once ' phpqrcode.php ';  $value = $url;         Two-dimensional code content  $errorCorrectionLevel = ' L ';  Fault tolerance level  $matrixPointSize = 5;      Generate picture size  //Generate two-dimensional code picture  $QR = QRCode::p ng ($value, False, $errorCorrectionLevel, $matrixPointSize, 2);} Call View results scerweima2 (' https://www.baidu.com ');
The first two methods, each call will be generated locally a two-dimensional code image, the third method, do not generate files, will be directly output QR code into the browser.