一款php生成验证码实现代码,自定义了session的目录,这样就不是php.ini里默认的session文件保存路径了,如下面session_save_path,可重新定义目录.

session_save_path,可重新定义目录,php生成验证码实现代码如下:

1. $sesssavepath = dirname(__file__)."/../data/sessions/";
2. if(is_writeable($sesssavepath) && is_readable($sesssavepath)){ session_save_path($sesssavepath); }
3. session_start();
4. $vstr = '';
5. for($i=0; $i<4; $i++) $vstr .= chr(mt_rand(65,90));
6. if(function_exists("imagecreate")){
7. $ntime = time();
8. if(emptyempty($_session['verifycode_last']) || emptyempty($_session['verifycode']) || ($ntime - $_session['verifycode_last'] > 5)){
9. $_session['verifycode'] = strtolower($vstr);
10. $_session['verifycode_last'] = $ntime;
11. }
12. $vstr = $_session['verifycode'];
13. $vstrlen = strlen($vstr);
14. $img = imagecreate(50,20);
15. imagecolorallocate($img, 255,255,255);
16. $line1 = imagecolorallocate($img,240,220,180);
17. $line2 = imagecolorallocate($img,250,250,170);
18. for($j=3;$j<=16;$j=$j+3){
19. imageline($img,2,$j,48,$j,$line1);
20. }
21. for($j=2;$j<52;$j=$j+(mt_rand(3,6))){
22. imageline($img,$j,2,$j-6,18,$line2);
23. }
24. $bordercolor = imagecolorallocate($img, 0x99,0x99,0x99);
25. imagerectangle($img, 0, 0, 49, 19, $bordercolor);
26. $fontcolor = imagecolorallocate($img, 48,61,50);
27. for($i=0;$i<$vstrlen;$i++){
28. $bc = mt_rand(0,1);
29. $vstr[$i] = strtoupper($vstr[$i]);
30. imagestring($img, 5, $i*10+6, mt_rand(2,4), $vstr[$i], $fontcolor);
31. }
32. header("pragma:no-cachern");
33. header("cache-control:no-cachern");
34. header("expires:0rn");
35. if(function_exists("imagejpeg")){
36. header("content-type:image/jpegrn");
37. imagejpeg($img);
38. }else{
39. header("content-type:image/pngrn");
40. imagepng($img);
41. }
42. imagedestroy($img);
43. exit();//开源代码phpfensi.com
44. }