Php verification code only displays the canvas in linux, but does not display the ultimate solution of the verification code _ PHP Tutorial

In linux, the php verification code only displays the canvas. the ultimate solution is not to display the verification code. After passing the test, first release my code [php]? Phpsession_start (); ** remove boom to UTF-8 * vCode (m, n, x, y). The size of m digits is n-side width x-side height y * blog. qita. in * after testing, I first release my code

[Php] Session_start ();
/** Remove boom as UTF-8.
* The value of vCode (m, n, x, y) m is n-side width x-side height y.
* Http://blog.qita.in
* Record the session $ code by yourself
*/

VCode (4, 12); // 4 digits, the display size is 15

Function vCode ($ num = 4, $ size = 20, $ width = 0, $ height = 0 ){
! $ Width & amp; $ width = $ num * $ size * 4/5 + 5;
! $ Height & $ height = $ size + 10;
// Remove 0 1 O l and so on
$ Str= "23456789 abcdefghijkmnpqrstuvwxyzABCDEFGHIJKLMNPQRSTUVW ";
$ Code = '';
For ($ I = 0; $ I <$ num; $ I ++ ){
$ Code. = $ str [mt_rand (0, strlen ($ str)-1)];
}
// Draw an image
$ Im = imagecreatetruecolor ($ width, $ height );
// Define the color to be used
$ Back_color = imagecolorallocate ($ im, 235,236,237 );
$ Boer_color = imagecolorallocate ($ im, 118,151,199 );
$ Text_color = imagecolorallocate ($ im, mt_rand (0,200), mt_rand (0,120), mt_rand (0,120 ));
// Draw the background
Imagefilledrectangle ($ im, 0, 0, $ width, $ height, $ back_color );
// Draw a border
Imagerectangle ($ im, 0, 0, $ width-1, $ height-1, $ boer_color );
// Draw interference lines
For ($ I = 0; $ I <5; $ I ++ ){
$ Font_color = imagecolorallocate ($ im, mt_rand (0,255), mt_rand (0,255), mt_rand (0,255 ));
Imagearc ($ im, mt_rand (-$ width, $ width), mt_rand (-$ height, $ height), mt_rand (30, $ width * 2), mt_rand (20, $ height * 2), mt_rand (0,360), mt_rand (0,360), $ font_color );
}
// Draw interference points
For ($ I = 0; $ I <50; $ I ++ ){
$ Font_color = imagecolorallocate ($ im, mt_rand (0,255), mt_rand (0,255), mt_rand (0,255 ));
Imagesetpixel ($ im, mt_rand (0, $ width), mt_rand (0, $ height), $ font_color );
}
// Drawing verification code http://www.ruoshuiyx.com reproduced please retain the source Thank you, will not affect your code execution speed if not please information if water impression network webmaster
// @ Imagefttext ($ im, $ size, 0, 5, $ size + 3, $ text_color, 'C: \ WINDOWS \ Fonts \ simsun. ttc ', $ code );
// The above is the trial in windows and the trial in LINUX, the corresponding font needs to be uploaded
@ Imagefttext ($ im, $ size, 0, 5, $ size + 3, $ text_color, '../msyh. ttf', $ code );
$ _ SESSION ["VerifyCode"] = strtolower ($ code); // converts it to lowercase.
Header ("Cache-Control: max-age = 1, s-maxage = 1, no-cache, must-revalidate ");
Header ("Content-type: image/png; charsets = utf-8 ");
Imagepng ($ im );
Imagedestroy ($ im );
}

?>

Session_start ();
/** Remove boom as UTF-8.
* The value of vCode (m, n, x, y) m is n-side width x-side height y.
* Http://blog.qita.in
* Record the session $ code by yourself
*/

VCode (4, 12); // 4 digits, the display size is 15

Function vCode ($ num = 4, $ size = 20, $ width = 0, $ height = 0 ){
! $ Width & amp; $ width = $ num * $ size * 4/5 + 5;
! $ Height & $ height = $ size + 10;
// Remove 0 1 O l and so on
$ Str= "23456789 abcdefghijkmnpqrstuvwxyzABCDEFGHIJKLMNPQRSTUVW ";
$ Code = '';
For ($ I = 0; $ I <$ num; $ I ++ ){
$ Code. = $ str [mt_rand (0, strlen ($ str)-1)];
}
// Draw an image
$ Im = imagecreatetruecolor ($ width, $ height );
// Define the color to be used
$ Back_color = imagecolorallocate ($ im, 235,236,237 );
$ Boer_color = imagecolorallocate ($ im, 118,151,199 );
$ Text_color = imagecolorallocate ($ im, mt_rand (0,200), mt_rand (0,120), mt_rand (0,120 ));
// Draw the background
Imagefilledrectangle ($ im, 0, 0, $ width, $ height, $ back_color );
// Draw a border
Imagerectangle ($ im, 0, 0, $ width-1, $ height-1, $ boer_color );
// Draw interference lines
For ($ I = 0; $ I <5; $ I ++ ){
$ Font_color = imagecolorallocate ($ im, mt_rand (0,255), mt_rand (0,255), mt_rand (0,255 ));
Imagearc ($ im, mt_rand (-$ width, $ width), mt_rand (-$ height, $ height), mt_rand (30, $ width * 2), mt_rand (20, $ height * 2), mt_rand (0,360), mt_rand (0,360), $ font_color );
}
// Draw interference points
For ($ I = 0; $ I <50; $ I ++ ){
$ Font_color = imagecolorallocate ($ im, mt_rand (0,255), mt_rand (0,255), mt_rand (0,255 ));
Imagesetpixel ($ im, mt_rand (0, $ width), mt_rand (0, $ height), $ font_color );
}
// Drawing verification code http://www.ruoshuiyx.com reproduced please retain the source Thank you, will not affect your code execution speed if not please information if water impression network webmaster
// @ Imagefttext ($ im, $ size, 0, 5, $ size + 3, $ text_color, 'C: \ WINDOWS \ Fonts \ simsun. ttc ', $ code );
// The above is the trial in windows and the trial in LINUX, the corresponding font needs to be uploaded
@ Imagefttext ($ im, $ size, 0, 5, $ size + 3, $ text_color, '../msyh. ttf', $ code );
$ _ SESSION ["VerifyCode"] = strtolower ($ code); // converts it to lowercase.
Header ("Cache-Control: max-age = 1, s-maxage = 1, no-cache, must-revalidate ");
Header ("Content-type: image/png; charsets = utf-8 ");
Imagepng ($ im );
Imagedestroy ($ im );
}

?>

After copying and downloading, note lines 41 and 43. if the server is windows, comment out lines 43 and keep lines 41. if the server is windows, replace lines 43.

In linux, note that the corresponding font should be placed in the parent directory. for example, I use. Other methods will not be shown in the end. Try it now

Why [php]? Php session_start ();/** remove boom as UTF-8 * vCode (m, n, x, y) m digit display size is n side width x side height y * http://blog.qita.in *...