这篇文章主要介绍了php实现的验证码文件类,实例分析了php生成验证码文件的技巧,非常具有实用价值,需要的朋友可以参考下,本文实例讲述了php实现的验证码文件类。分享给大家供大家参考,具体如下：

1. <?php
2. /**
3. * @file
4. * @version 1.0
5. * @author 网海浪子
6. * @brief 验证码文件类
7. *
8. */
9. class CCheckCodeFile
10. {
11. //验证码位数
12. private $mCheckCodeNum = 4;
13. //产生的验证码
14. private $mCheckCode = '';
15. //验证码的图片
16. private $mCheckImage = '';
17. //干扰像素
18. private $mDisturbColor = '';
19. //验证码的图片宽度
20. private $mCheckImageWidth = '80';
21. //验证码的图片宽度
22. private $mCheckImageHeight = '20';
23. /**
24. *
25. * @brief 输出头
26. *
27. */
28. private function OutFileHeader()
29. {
30. header ("Content-type: image/png");
31. }
32. /**
33. *
34. * @brief 产生验证码
35. *
36. */
37. private function CreateCheckCode()
38. {
39. $this->mCheckCode = strtoupper(substr(md5(rand()),0,$this->mCheckCodeNum));
40. return $this->mCheckCode;
41. }
42. /**
43. *
44. * @brief 产生验证码图片
45. *
46. */
47. private function CreateImage()
48. {
49. $this->mCheckImage = @imagecreate ($this->mCheckImageWidth,$this->mCheckImageHeight);
50. imagecolorallocate ($this->mCheckImage, 200, 200, 200);
51. return $this->mCheckImage;
52. }
53. /**
54. *
55. * @brief 设置图片的干扰像素
56. *
57. */
58. private function SetDisturbColor()
59. {
60. for ($i=0;$i<=128;$i++)
61. {
62. $this->mDisturbColor = imagecolorallocate ($this->mCheckImage, rand(0,255), rand(0,255), rand(0,255));
63. imagesetpixel($this->mCheckImage,rand(2,128),rand(2,38),$this->mDisturbColor);
64. }
65. }
66. /**
67. *
68. * @brief 设置验证码图片的大小
69. *
70. * @param $width 宽
71. *
72. * @param $height 高
73. *
74. */
75. public function SetCheckImageWH($width,$height)
76. {
77. if($width==''||$height=='')return false;
78. $this->mCheckImageWidth = $width;
79. $this->mCheckImageHeight = $height;
80. return true;
81. }
82. /**
83. *
84. * @brief 在验证码图片上逐个画上验证码
85. *
86. */
87. private function WriteCheckCodeToImage()
88. {
89. for ($i=0;$i<=$this->mCheckCodeNum;$i++)
90. {
91. $bg_color = imagecolorallocate ($this->mCheckImage, rand(0,255), rand(0,128), rand(0,255));
92. $x = floor($this->mCheckImageWidth/$this->mCheckCodeNum)*$i;
93. $y = rand(0,$this->mCheckImageHeight-15);
94. imagechar ($this->mCheckImage, 5, $x, $y, $this->mCheckCode[$i], $bg_color);
95. }
96. }
97. /**
98. *
99. * @brief 输出验证码图片
100. *
101. */
102. public function OutCheckImage()
103. {
104. $this ->OutFileHeader();
105. $this ->CreateCheckCode();
106. $this ->CreateImage();
107. $this ->SetDisturbColor();
108. $this ->WriteCheckCodeToImage();
109. imagepng($this->mCheckImage);
110. imagedestroy($this->mCheckImage);
111. }
112. }
113. $c_check_code_image = new CCheckCodeFile();
114. //$c_check_code_image ->SetCheckImageWH(100,50);
115. //设置显示验证码图片的尺寸
116. $c_check_code_image ->OutCheckImage();
117. ?>