1 function _code($_code_length = 4, $_width = 75, $_height = 25){
2 for($i=0;$i<$_code_length;$i++){
3 $_nmsg .= dechex(mt_rand(0,15));
4 }
5 $_SESSION["code"] = $_nmsg;
6
7 $_img = imagecreatetruecolor($_width, $_height);
8
9 $_white = imagecolorallocate($_img, 250, 250, 250);
10
11 imagefill($_img, 0, 0, $_white);
12
13 $_gray = imagecolorallocate($_img, 196, 196, 196);
14
15 imagerectangle($_img, 0, 0, $_width-1, $_height-1, $_gray);
16
17 for ($i=0; $i < 6; $i++) {
18 $_md_color = imagecolorallocate($_img, mt_rand(200,255), mt_rand(200,255), mt_rand(200,255));
19 imageline($_img, mt_rand(0,$_width), mt_rand(0, $_height),mt_rand(0,$_width), mt_rand(0, $_height), $_md_color);
20 }
21
22 for ($i=0; $i < 50; $i++) {
23 $_md_color = imagecolorallocate($_img, mt_rand(200,255), mt_rand(200,255), mt_rand(200,255));
24 imagestring($_img, 1, mt_rand(1,$_width-5), mt_rand(1, $_height-5), "*", $_md_color);
25 }
26
27 for ($i=0; $i < $_code_length ; $i++) {
28 $_md_color = imagecolorallocate($_img, mt_rand(0,102), mt_rand(0,102), mt_rand(0,102));
29 imagestring($_img, 5, $i * $_width/$_code_length+ mt_rand(1, 10), mt_rand(1, $_height/2), $_SESSION["code"][$i], $_md_color);
30 }
31
32 header("Content-Type:image/png");
33
34 imagepng($_img);
35
36 imagedestroy($_img);
37 }