Two methods for generating two-dimensional code using PHP (with logo image)

First, using the Google API to generate two-dimensional code
Google provides a more complete QR code generation interface, call API interface is very simple, the following is the calling code:

 $urlToEncode = "Http://www.jb51.net"; Generateqrfromgoogle ($urlToEncode);/** *  Google API qr code generation "QRCode can store up to 4,296 alphanumeric types of arbitrary text, you can view the QR code data format" * @param string $chl QR Code contains information, can be numbers, characters, binary information, Chinese characters. Data types cannot be mixed, data must go through UTF-8 url-encoded * @param int $widhtHeight dimension setting for QR code * @param string $EC _level Optional error correction level, QR code supports four levels of error correction to recover lost  Missing, misread, fuzzy, data. * L Default: Can identify loss of 7% of data * M can identify loss of 15% of data * Q can identify lost 25% of the data * H can recognize the loss of 30% data * @param int $margin The resulting QR code distance from the picture border */func  tion Generateqrfromgoogle ($chl, $widhtHeight = ' Max ', $EC _level= ' L ', $margin = ' 0 ') {$chl = UrlEncode ($CHL); Echo '  '; } 

　　Second, the use of PHP QR code to generate a class library PHP code to generate two-dimensional codes

PHP QR code is a php two-dimensional code generation library, using it can easily generate two-dimensional code, the official website provides a download and demo demo, view address: http://phpqrcode.sourceforge.net/.
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.

public static function png ($text, $outfile =false, $level =qr_eclevel_l, $size =3, $margin =4, $saveandprint =false) {  $ ENC = qrencode::factory ($level, $size, $margin);  

Calling PHP QR code is very simple, and the following code generates a QR code that reads "Http://www.jb51.net".
PHP code
Include ' phpqrcode.php ';
QRCode::p ng (' http://www.jb51.net ');

So in practical applications, we will add their own logo in the middle of the QR 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.

Include ' phpqrcode.php '; $value = ' http://www.jb51.net '; 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 $QR = ' qrcode.png ';//The original two-dimensional code figure already generated if ($logo!== FALSE) {$QR = Imagecreatefromstring (fil  E_get_contents ($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 $logo _he  ight = Imagesy ($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-$logo _qr_width)/2; Regroup and resize the picture imagecopyresampled ($QR, $logo, $from _width, $from _width, 0, 0, $logo _qr_width, $logo _qr_height, $logo _wid Th, $logo _height); }//Output picture imagepng ($QR, ' helloweba.png ');  Echo '  ';

Below is the reference to the above code, do not produce picture files, convenient to call, save the following code as img.php

<?phpinclude ' phpqrcode.php '; $value = $_get[' url '];//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 = ' jb51.png ';///Ready logo image $QR = ' qrcode.png ';//The original two-dimensional code figure already generated  if ($logo!== FALSE) {  $QR = Imagecreatefromstri Ng (file_get_contents ($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 image width  $logo _height = Imagesy ($logo),//logo image height  $logo _qr_width = $QR _width/5;  $scale = $logo _width/$logo _qr_width;  $logo _qr_height = $logo _height/$scale;  $from _width = ($QR _width-$logo _qr_width)/2;  Regroup and resize the picture  imagecopyresampled ($QR, $logo, $from _width, $from _width, 0, 0, $logo _qr_width,  $logo _qr_ Height, $logo _width, $logo _height); }//Output picture Header ("Content-type:image/png"); Imagepng ($QR);

　　

Call Method:

Because the two-dimensional code allows a certain degree of fault tolerance, the general QR code even in the masked part but still able to decode, often we scan the QR code when scanned to even less than half of the scanning results can be decoded, because the generator will be part of the information repeated representation to improve its fault tolerance, This is why we add a logo image in the middle of the QR code does not affect the decoding result of the reason.

Two methods for generating two-dimensional code using PHP (with logo image)