Using Phpqrcode to generate two-dimensional code

Using the PHP language to generate two-dimensional code, or very difficult, of course, call to generate two-dimensional code image of the interface (such as: http://www.liantu.com/network interface), except if you write code generation, really do not know. 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,: 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:

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2. Public static function png ($text, $outfile = False, $level = qr_eclevel_l, $size = 3, $margin = 4, $saveandprint =false)
4. {
6. $enc = qrencode::factory ($level, $size, $margin);
8. return $enc->encodepng ($text, $outfile, $saveandprint =false);
10. }

The 1th parameter $text: The QR code contains the content, may be the link, the text, the JSON string and so on;
The 2nd parameter $outfile: The default is False, does not generate the file, only the two-dimensional code picture returns the output;
The 3rd parameter $level: The default is L, this parameter can be passed the values 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 fault tolerance of the two-dimensional code, and the different parameters indicate the percentage of the area where the QR code can be covered, that is, the covered area can 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)

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2. 1. Generate the original QR code (generate picture file)
4. function Scerweima ($url =") {
6. require_once ' phpqrcode.php ';
10. $value = $url; //Two-D code content
14. $errorCorrectionLevel = ' L '; //Fault tolerance level
16. $matrixPointSize = 5; //Generate picture size
20. //Generate two-dimensional code image
22. $filename = ' qrcode/'. Microtime ().  PNG ';
24. QRCode::p ng ($value,$filename, $errorCorrectionLevel, $matrixPointSize, 2);
28. $QR = $filename; //The original QR code image file that has been generated
34. $QR = imagecreatefromstring (file_get_contents ($QR));
38. //Output picture
40. Imagepng ($QR, ' qrcode.png ');
42. Imagedestroy ($QR);
44. return '
46. }
50. Invoke View Results
52. echo Scerweima (' https://www.baidu.com ');

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

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2. 2. Add logo to generated QR code (create picture file)
4. function scerweima1 ($url =") {
6. require_once ' phpqrcode.php ';
8. $value = $url; //Two-D code content
10. $errorCorrectionLevel = ' H '; //Fault tolerance level
12. $matrixPointSize = 6; //Generate picture size
14. //Generate two-dimensional code image
16. $filename = ' qrcode/'. Microtime ().  PNG ';
18. QRCode::p ng ($value,$filename, $errorCorrectionLevel, $matrixPointSize, 2);
22. $logo = ' qrcode/logo.jpg '; //Ready logo image
24. $QR = $filename; //The original two-dimensional code diagram that has been generated
28. if (file_exists ($logo)) {
30. $QR = imagecreatefromstring (file_get_contents ($QR));  //target image connection resources.
32. $logo = imagecreatefromstring (file_get_contents ($logo));  //Source Image connection resources.
34. $QR _width = imagesx ($QR); //Two-D code image width
36. $QR _height = Imagesy ($QR); //Two-D code image height
38. $logo _width = imagesx ($logo); //logo picture width
40. $logo _height = Imagesy ($logo); //logo Picture height
42. $logo _qr_width = $QR _width/4; //The width of the logo after the combination (1/5 of the two-dimensional code)
44. $scale = $logo _width/$logo _qr_width; width scaling ratio of//logo (width of itself/width after combination)
46. $logo _qr_height = $logo _height/$scale; //The height of logo after combination
48. $from _width = ($QR _width- $logo _qr_width)/2; //Combination logo in the upper left corner of the coordinate point
52. //Regroup and resize pictures
54. /* 
56. * imagecopyresampled () copies a square area of an image (source image) into another image
58. */
60. Imagecopyresampled ($QR, $logo, $from _width, $from _width, 0, 0, $logo _qr_width,$logo _qr_   Height, $logo _width, $logo _height);
62. }
66. //Output picture
68. Imagepng ($QR, ' qrcode.png ');
70. Imagedestroy ($QR);
72. Imagedestroy ($logo);
74. return '
76. }
80. Invoke View Results
82. echo scerweima1 (' https://www.baidu.com ');

3. Generate QR code (no image file generated)

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2. 3. Generate the original QR code (no picture file is generated)
4. function Scerweima2 ($url =") {
6. require_once ' phpqrcode.php ';
10. $value = $url; //Two-D code content
12. $errorCorrectionLevel = ' L '; //Fault tolerance level
14. $matrixPointSize = 5; //Generate picture size
16. //Generate two-dimensional code image
18. $QR = QRCode::p ng ($value, False,$errorCorrectionLevel, $matrixPointSize, 2);
20. }
22. Invoke View Results
24. 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 to the browser.

Using Phpqrcode to generate two-dimensional code