简单实用的PHP验证码类

一个简单实用的php验证码类，分享出来 ，供大家参考。

代码如下：

1. <?php
2. /**
3. @ php 验证码类
4. @ http://www.jbxue.com
5. */
6. Class code
7. {
8. var $width =80; //图片的宽
9. var $hight =50; //图片的高
10. var $image;
11. var $red =69; //图片的RGB颜色
12. var $green =188; //红
13. var $blue =105 ;//绿
14. var $pix =100 ;//蓝
15. var $pixcolor; //杂色颜色;
16. var $pixred = 255 ; //红
17. var $pixgreen = 255;//绿
18. var $pixblue = 255; //蓝
19. var $txt=null;//验证码文字
20. var $txtcode=null;
21. var $txtsub=null;
22. var $pixnum = 300; //杂点数量
23. var $i=0;
24. var $widthpx=0;
25. var $highty=0;
26. var $txtreg=20;
27. var $txtgreen=30;
28. function createimage()  //创建一张图并填色
29. {
30. $this->image = imagecreate($this->width,$this->hight);
31. $this->color = imagecolorallocate($this->image,$this->red,$this->green,$this->blue);
32. return imagefill($this->image,0,0,$this->color);
33. }
34. function createpix() //干扰因素
35. {
36. for($this->i=1;$this->i<$this->pixnum;$this->i++)
37. {
38. $this->widthpx = rand(0,$this->width);
39. $this->highty = rand(0,$this->hight);
40. $this->pixcolor = imagecolorallocate($this->image,$this->pixred,$this->pixgreen,$this->pixblue);
41. imagesetpixel($this->image,$this->widthpx,$this->highty,$this->pixcolor);
42. }
43. }
44. function gettxt() //创建验证码文字
45. {
46. $this->txt = array("A","B","C","D","E","F","G","H","I","M","Y","a","b","e","u","v","w","x","y","z","1","2","3","4","5","6","7","8","9","0");
47. for($this->i=0;$this->i<6;$this->i++)
48. {
49. $this->sub = $this->txt[rand(0,29)];
50. $this->txtcode.= $this->sub;
51. }
52. session_start();
53. $_SESSION["code"] = $this->txtcode;
54. }
55. function createstring() //创建验证码图片
56. {
57. imagettftext($this->image,20,5,0,40,$this->pixcolor,"C:\WINDOWS\Fonts\simsun.ttc ",$this->txtcode);
58. header("content-type:image/png");
59. return imagepng($this->image);
60. imagedestroy($this->image);
61. }
62. function getcodeimage()//获得验证码图片
63. {
64. $this->createimage();
65. $this->createpix();
66. $this->gettxt();
67. $this->createstring();
68. }
69. }
70. ?>
71. <?php
72. $text = new code;
73. $text->createimage();
74. $text->gettxt();
75. $text->createpix();
76. $text->createstring();
77. ?>

以上就是本节 php教程 提供的例子，php验证码在实际的编程中用的比较多，用户注册、会员评论等功能中都会用到，好好学习下吧。