Detailed explanation of phpqrcode class to generate QR code

This time I will bring you a detailed explanation of the QR code generated by the phpqrcode class. What are the precautions for generating the QR code by the phpqrcode class. The following is a practical case, let's take a look.

The example in this article describes how PHP generates QR codes based on the phpqrcode class. Share it with everyone for your reference, the details are as follows:

It is quite difficult to use PHP language to generate QR codes. Of course, the interface for generating QR code images is called (for example: Liantu.com http://www .liantu.com/ interface), if you write the code to generate it yourself, you really have no way to start. However, we can use phpqrcode, a ready-made class file, PHP QR code generation class library, which can easily generate QR codes.

Preliminary preparation:

1.phpqrcode classFile download, download address: https://sourceforge.net /projects/phpqrcode/
2. The PHP environment must enable GD2 extension library support (usually enabled)

Interpretation of method:

The downloaded class file is a compressed package, which contains many files and demonstration programs. We only need the phpqrcode.php file inside to generate the QR code. It is a collection file of multiple classes. We need to use the png() method (line 3090) of the QRcode class (line 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 first parameter$text : The content contained in the QR code can be links, text, json strings, etc.;
The second parameter $outfile: The default is false, no file is generated, and only the second parameter is The QR code image is returned as output; otherwise, the file name and path to store the generated QR code image need to be given;
The third parameter$level: The default is L, the values ​​that can be passed by this parameter are L(QR_ECLEVEL_L, 7%), M(QR_ECLEVEL_M, 15%), Q(QR_ECLEVEL_Q, 25%), H(QR_ECLEVEL_H, 30%), this parameter controls the error tolerance rate of the QR code. Different parameters indicate that the QR code can be The percentage of the area covered, that is, the covered area can still be identified;
The fourth parameter$size: Controls the size of the generated image, the default is 4;
The fifth parameter$margin: Control the size of the blank area for generating QR codes;
The sixth parameter $saveandprint: Save the QR code image and display it, $outfile must pass the image path;

Usage example:

1. Generate QR code (generate image file)

// 1. 生成原始的二维码(生成图片文件)
function scerweima($url=''){
  require_once 'phpqrcode.php';
  $value = $url;         //二维码内容
  $errorCorrectionLevel = 'L';  //容错级别
  $matrixPointSize = 5;      //生成图片大小
  //生成二维码图片
  $filename = 'qrcode/'.microtime().'.png';
  QRcode::png($value,$filename , $errorCorrectionLevel, $matrixPointSize, 2);
  $QR = $filename;        //已经生成的原始二维码图片文件
  $QR = imagecreatefromstring(file_get_contents($QR));
  //输出图片
  imagepng($QR, 'qrcode.png');
  imagedestroy($QR);
  return '<img  src="/static/imghwm/default1.png" data-src="qrcode.png" class="lazy" alt="Detailed explanation of phpqrcode class to generate QR code" >';
}
//调用查看结果
echo scerweima('https://www.baidu.com');

2. Add logo to the generated QR code (generate image file)

//2. 在生成的二维码中加上logo(生成图片文件)
function scerweima1($url=''){
  require_once 'phpqrcode.php';
  $value = $url;         //二维码内容
  $errorCorrectionLevel = 'H';  //容错级别
  $matrixPointSize = 6;      //生成图片大小
  //生成二维码图片
  $filename = 'qrcode/'.microtime().'.png';
  QRcode::png($value,$filename , $errorCorrectionLevel, $matrixPointSize, 2);
  $logo = 'qrcode/logo.jpg'; //准备好的logo图片
  $QR = $filename;      //已经生成的原始二维码图
  if (file_exists($logo)) {
    $QR = imagecreatefromstring(file_get_contents($QR));    //目标图象连接资源。
    $logo = imagecreatefromstring(file_get_contents($logo));  //源图象连接资源。
    $QR_width = imagesx($QR);      //二维码图片宽度
    $QR_height = imagesy($QR);     //二维码图片高度
    $logo_width = imagesx($logo);    //logo图片宽度
    $logo_height = imagesy($logo);   //logo图片高度
    $logo_qr_width = $QR_width / 4;   //组合之后logo的宽度(占二维码的1/5)
    $scale = $logo_width/$logo_qr_width;  //logo的宽度缩放比(本身宽度/组合后的宽度)
    $logo_qr_height = $logo_height/$scale; //组合之后logo的高度
    $from_width = ($QR_width - $logo_qr_width) / 2;  //组合之后logo左上角所在坐标点
    //重新组合图片并调整大小
    /*
     * imagecopyresampled() 将一幅图像(源图象)中的一块正方形区域拷贝到另一个图像中
     */
    imagecopyresampled($QR, $logo, $from_width, $from_width, 0, 0, $logo_qr_width,$logo_qr_height, $logo_width, $logo_height);
  }
  //输出图片
  imagepng($QR, 'qrcode.png');
  imagedestroy($QR);
  imagedestroy($logo);
  return '<img  src="/static/imghwm/default1.png" data-src="qrcode.png" class="lazy" alt="Detailed explanation of phpqrcode class to generate QR code" >';
}
//调用查看结果
echo scerweima1('https://www.baidu.com');

3. Generate QR code (do not generate image file)

//3. 生成原始的二维码(不生成图片文件)
function scerweima2($url=''){
  require_once 'phpqrcode.php';
  $value = $url;         //二维码内容
  $errorCorrectionLevel = 'L';  //容错级别
  $matrixPointSize = 5;      //生成图片大小
  //生成二维码图片
  $QR = QRcode::png($value,false,$errorCorrectionLevel, $matrixPointSize, 2);
}
//调用查看结果
scerweima2('https://www.baidu.com');

The first two methods will generate a QR code image locally every time they are called. The third method will directly output the QR code to the browser without generating a file.

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

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