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生成验证码

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Release： 2016-07-25 08:44:00
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  1. require_once('string.func.php');
  3. function verifyImage( $type=1,$length=4,$pixel=0,$line=0,$sess_name="verify"){
  5. session_start();
  6. /*定义长度和宽度*/
  7. $width=80;
  8. $height=30;
  9. /* 创建画布*/
  10. $image=imagecreatetruecolor($width, $height);
  12. /*本函数用来匹配图形的颜色，供其它绘图函数使用。参数 image 表示图形的 handle。参数 red、green、blue 是色彩三原色，其值从 0 至 255....我在此定义黑色和白色*/
  13. $white=imagecolorallocate($image, 255, 255, 255);
  14. $black=imagecolorallocate($image,0,0,0);
  16. /*本函数将图片的封闭长方形区域着色。参数 x1、y1 及 x2、y2 分别为矩形对角线的坐标。参数 col 表示欲涂上的颜色*/
  17. imagefilledrectangle($image, 1, 1, $width-2, $height-2, $white);
  19. /*buildRandomString函数用来生成一个验证码*/
  20. $chars=buildRandomString($type,$length);
  22. /*将验证码给session以便用来判断用户输入是否正确*/
  23. $_SESSION[$sess_name]=$chars;
  25. /*定义字体库*/
  26. $fontfiles=array('msyh.ttf','msyhbd.ttf','simsun.ttc','SIMYOU.TTF','STHUPO.TTF','STKAITI.TTF','STLITI.TTF');
  29. /*用循环来将验证码一个一个的写入图片中*/
  30. for($i=0;$i{
  31. $size=mt_rand(14,18);
  32. $angle=mt_rand(-15,15);
  34. /*验证码的横坐标与纵坐标*/
  35. $x=5+$i*$size;
  36. $y=mt_rand(20,26);
  38. $color=imagecolorallocate($image,mt_rand(50,190),mt_rand(50,200),mt_rand(50,90));
  39. $fontfile="../font/".$fontfiles[mt_rand(0,count($fontfiles)-1)];
  40. $text=substr($chars,$i,1);
  42. /*本函数将 TTF (TrueType Fonts) 字型文字写入图片*/
  43. imagettftext($image, $size, $angle, $x, $y, $color, $fontfile, $text);
  44. }
  45. if($pixel)
  46. {
  47. for($i=0;$i{
  48. /*本函数可在图片上绘出一点。参数 x、y 为欲绘点的坐标，参数 col 表示该点的颜色*/
  49. imagesetpixel($image, mt_rand(0,$width-1), mt_rand(0,$height-1), $black);
  50. }}
  51. if($line)
  52. {
  53. for($i=0;$i {
  54. $color=imagecolorallocate($image,mt_rand(50,90),mt_rand(50,200),mt_rand(50,90));
  55. /*画线段*/
  56. imageline($image, mt_rand(0,$width-1), mt_rand(0,$height-1), mt_rand(0,$width-1), mt_rand(0,$height-1), $color);
  57. }
  58. }
  59. /*以gif形式输出*/
  60. header("content-type:image/gif");
  61. /*建立GIF图 并输出到网页*/
  62. imagegif($image);
  63. /*释放与 image 关联的内存*/
  64. imagedestroy($image);
  65. }
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  2. function buildRandomString($type=1,$length=4){
  4. if($type==1)
  5. {
  6. /*join函数把数组转换为字符串。。join() 函数是 implode() 函数的别名*/
  7. $chars=join("",range(0,9));
  8. }elseif ($type==2) {
  9. /*array_merge函数合并数组*/
  10. $chars=join("",array_merge(range("a","z"),range("A","Z")));
  11. }elseif($type==3)
  12. {
  13. $chars=join("",array_merge(range("a","z"),range("A","Z"),range(0,9)));
  14. }
  16. if($length>strlen($chars))
  17. {
  18. exit("字符串长度不够");
  19. }
  20. /*打乱字符串*/
  21. $chars=str_shuffle($chars);
  22. return substr($chars,0,$length);
  24. }
  25. ?>
复制代码
验证码


Related labels：
Generate verification code
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