php数字验证码

2. session_start();
4. //生成验证码图片
6. Header("Content-type: image/PNG");
8. srand((double)microtime()*1000000);
10. $im = imagecreate(62,20);
12. $black = ImageColorAllocate($im, 69,120,239);
14. $white = ImageColorAllocate($im, 0,0,0);
16. $gray = ImageColorAllocate($im, 200,200,200);
18. imagefill($im,68,30,$gray);
20. while(($authnum=rand()%100000)
21. //将五位整数验证码绘入图片
23. imagestring($im, 5, 10, 3, $authnum, $white);
25. for($i=0;$i
26. {
28. $randcolor = ImageColorallocate($im,rand(0,255),rand(0,255),rand(0,255));
30. imagesetpixel($im, rand()%70 , rand()%30 , $randcolor);
32. }
33. ImagePNG($im);
34. ImageDestroy($im);
35. $_SESSION['SESSION_VALIDATE_CODE'] = $authnum.'';
37. ?>
41. $txt="memory";
42. $im = imagecreatetruecolor(400,30);
43. $white = ImageColorAllocate($im, 255,255,255);
44. $black = ImageColorAllocate($im, 0,0,0);
46. // Replace path by your own font path
47. imagestring($im,1,10,10,$txt,$black);
48. //imagettftext($im, 20, 0, 10, 20, $black, "font.ttf","Testing...");
49. header("Content-type:image/jpeg");
50. imagejpeg($im);
51. // imagedestroy($im);

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