php QR code generation

It is quite difficult to generate QR codes using PHP language. Of course, the interface for generating QR code images is called (for example: the interface of Liantu.com http://www.liantu.com/ ), if you write the code to generate it yourself, you really have no way to start.

However, We can use the ready-made class file phpqrcode, the PHP QR code generation class library, which can easily generate QR codes. (Recommended learning: PHP video tutorial)

phpqrcode class file download, download address: https://sourceforge.net/projects/phpqrcode

PHP environment must enable GD2 extension library support (usually enabled)

The downloaded class file is a compressed package, which contains many files and demonstration programs. We only need the phpqrcode inside. This php file can generate a 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)<br/>{<br/>  $enc = QRencode::factory($level, $size, $margin);<br/>  return $enc->encodePNG($text, $outfile, $saveandprint=false);<br/>}<br/>

The first parameter $text: two-dimensional The content contained in the code can be links, text, json strings, etc.;

The second parameter $outfile: the default is false, no file is generated, and only the QR code image is returned for output; Otherwise, you need to give the file name and path to store the generated QR code image;

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 represent the percentage of the area that the QR code can be covered, that is, covered The area can also be identified;

The fourth parameter $size: controls the size of the generated image, the default is 4;

The fifth parameter $margin: controls the blank area for generating the QR code Size;

The sixth parameter $saveandprint: save the QR code image and display it, $outfile must pass the image path;

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