PHP outputs the session verification code and the picture are not synchronized, and the picture is always a quick step to solve! Solution

PHP outputs the session verification code and the picture are not synchronized, and the picture is always a quick step to solve! PHP outputs the session verification code and the picture are not synchronized, and the picture is always a quick step to solve! PHPcode & lt ;? Session_start (); functionrandom ($ len) {$ srcstr & quot; ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789 & PHP output the session verification code is not synchronized with the image, and the image is always a quick step!
PHP outputs the session verification code and the picture are not synchronized, and the picture is always a quick step to solve!

PHP code

PHP code

------ Solution --------------------
This problem is very strange. The best way is to separate it.
Try this.
Checkcode. class. php

PHP code

  Doimage (); * // get verification * $ _ SESSION ['code'] = $ checkcode-> get_code (); session_start (); include '. /checkcode. class. php '; $ checkcode = new checkcode ('C: \ WINDOWS \ Fonts \ ARIAL. ttf'); $ checkcode-> doimage (); $ _ SESSION ['code'] = $ checkcode-> get_code (); */class checkcode {// the verification code width is public $ width = 130; // the verification code height is public $ height = 50; // set the font address private $ font; // set the font color public $ font_color; // Set the random generation factor public $ charset = 'abcdef GhkmnprstuvwyzABCDEFGHKLMNPRSTUVWYZ23456789 '; // set the background color public $ background =' # EDF7FF '; // Number of characters generating the verification code public $ code_len = 4; // The font size public $ font_size; // verification code private $ code; // Image memory private $ img; // private $ x_start where the x axis of the text starts; function _ construct ($ fontpath) {$ this-> font = $ fontpath;}/*** generates a random verification code. */Protected function creat_code () {$ code = ''; $ charset_len = strlen ($ this-> charset)-1; for ($ I = 0; $ I <$ this-> code_len; $ I ++) {$ code. = $ this-> charset [rand (1, $ charset_len)] ;}$ this-> code = $ code ;}/ *** get verification code */public function get_code () {return strtolower ($ this-> code);}/*** generate image */public function doimage () {$ code = $ this-> creat_code (); $ this-> img = imagecreatetruecolor ($ this-> width, $ This-> height); if (! $ This-> font_color) {$ this-> font_color = imagecolorallocate ($ this-> img, rand (0,156), rand (0,156), rand (0,156 ));} else {$ this-> font_color = imagecolorallocate ($ this-> img, hexdec (substr ($ this-> font_color, 1, 2), hexdec (substr ($ this-> font_color, 3, 2), hexdec (substr ($ this-> font_color, 5, 2);} // sets the background color $ background = imagecolorallocate ($ this-> img, hexdec (substr ($ this-> background, 1, 2), hexdec (substr ($ This-> background, 3, 2), hexdec (substr ($ this-> background, 5, 2); // draw a cabinet and set the background color. Imagefilledrectangle ($ this-> img, 0, $ this-> height, $ this-> width, 0, $ background); $ this-> creat_font (); $ this-> creat_line (); $ this-> output ();}/*** generate text */private function creat_font () {$ x = $ this-> width/$ this-> code_len; for ($ I = 0; $ I <$ this-> code_len; $ I ++) {imagettftext ($ this-> img, $ this-> font_size, rand (-30, 30), $ x * $ I + rand (1.4), $ this-> height, $ this-> font_color, $ this-> font, $ this-> code [$ I]); if ($ I = 0) $ this-> x_start = $ x * $ I + 5;}/*** draw line */private function creat_line () {imagesetthickness ($ this-> img, 3 ); $ xpos = ($ this-> font_size * 2) + rand (-5, 5); $ width = $ this-> width/2.66 + rand (3, 10 ); $ height = $ this-> font_size * 2.14; if (rand (0,100) % 2 = 0) {$ start = rand ); $ ypos = $ this-> height/2-rand (10, 30); $ xpos + = rand (5, 15);} else {$ start = rand (180,246 ); $ ypos = $ this-> height/2 + rand (10, 30);} $ end = $ start + rand (75,110); imagearc ($ this-> img, $ xpos, $ ypos, $ width, $ height, $ start, $ end, $ this-> font_color); if (rand (1,75) % 2 = 0) {$ start = rand (45,111); $ ypos = $ this-> height/2-rand (10, 30); $ xpos + = rand (5, 15 );} else {$ start = rand (200,250); $ ypos = $ this-> height/2 + rand (10, 30);} $ end = $ start + rand (75,100 ); imagearc ($ this-> img, $ this-> width *. 75, $ ypos, $ width, $ height, $ start, $ end, $ this-> font_color);}/*** output image */private function output () {header ("content-type: image/png \ r \ n"); imagepng ($ this-> img); imagedestroy ($ this-> img );}}