Php QR code generation

As QR codes become increasingly popular. We need to know what a QR code is. as a phpprogramer, we need to know how to use php to generate a QR code. Let's talk a little bit about it. This article describes two methods to generate a QR code using php.
(1) open interface for generating QR codes using google. the code is as follows:

/*** Google api QR code generation [QRcode can store any text of a maximum of 4296 letters/numbers. for details, see the QR code data format] * @ param string $ data information contained in the QR code, it can be numbers, characters, binary information, and Chinese characters. Cannot mix data types, data must go through UTF-8 URL-encoded. if the information to be transmitted exceeds 2 K bytes, use the POST method * @ param int $ widhtHeight to generate the size setting of the QR code * @ param string $ EC_level (optional) error correction level, QR codes support four levels of error correction, which are used to restore lost, read error, fuzzy, and data. * L-default: 7% of lost data can be identified * M-15% of lost data can be identified * Q-25% of lost data can be identified * H-30% of lost data can be identified *@ distance from the QR code generated by param int $ margin to the image border */function generateQRfromGoogle ($ data, $ widhtHeight = '000000', $ EC_level = 'l', $ margin = '0') {$ url = urlencode ($ data); echo '';}

Usage:

$ Data = 'All rights reserved: http://www.jb51.net '; generateQRfromGoogle ($ data );

Post method:

Function qrcode ($ width, $ height, $ string) {$ post_data = array (); $ post_data ['cht'] = 'QR '; $ post_data ['chs '] = $ width. "x ". $ height; $ post_data ['check'] = $ string; $ post_data ['choe'] = "UTF-8"; $ url = "http://chart.apis.google.com/chart"; $ data_Array = array (); foreach ($ post_data as $ key => $ value) {$ data_Array [] = $ key. '= '. $ value ;}$ data = implode ("&", $ data_Array); $ ch = curl_init (); curl_setopt ($ ch, CURLOPT_POST, 1); curl_setopt ($ ch, CURLOPT_HEADER, 0); curl_setopt ($ ch, CURLOPT_URL, $ url); curl_setopt ($ ch, CURLOPT_POSTFIELDS, $ data); curl_setopt ($ ch, CURLOPT_RETURNTRANSFER, 1 ); $ result = curl_exec ($ ch); // echo ""; note: return $ result without writing the header ;}

Usage:

Header ("Content-type: image/png"); $ width = 300; $ height = 300; $ data = 'copyright: http://www.jb51.net '; echo qrcode ($ width, $ height, $ data );

Of course, the generated images are the same as above.

(2) use the php QR Code library to generate a QR Code
Note: To use this class library, you must first download the class library package ,:
Address: http://phpqrcode.sourceforge.net/
There are many examples in the downloaded package, which can be studied by yourself. The following is a simple use case (the specific parameter meaning is similar to the above ):

<? Php include ". /phpqrcode. php "; $ data = 'All rights reserved: http://www.jb51.net '; $ errorCorrectionLevel =" L "; $ matrixPointSize =" 4 "; QRcode: png ($ data, false, $ errorCorrectionLevel, $ matrixPointSize );

The above is all the content of this article. I hope it will be helpful for you to master the php production QR code.