PHP验证码文件类

2. class CCheckCodeFile
3. {
4. //验证码位数
5. private $mCheckCodeNum = 4;
7. //产生的验证码
8. private $mCheckCode = '';
10. //验证码的图片
11. private $mCheckImage = '';
13. //干扰像素
14. private $mDisturbColor = '';
16. //验证码的图片宽度
17. private $mCheckImageWidth = '80';
19. //验证码的图片宽度
20. private $mCheckImageHeight = '20';
22. /**
23. *
24. * @brief 输出头
25. *
26. */
27. private function OutFileHeader()
28. {
29. header ("Content-type: image/png");
30. }
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. }
43. /**
44. *
45. * @brief 产生验证码图片
46. *
47. */
48. private function CreateImage()
49. {
50. $this->mCheckImage = @imagecreate ($this->mCheckImageWidth,$this->mCheckImageHeight);
51. imagecolorallocate ($this->mCheckImage, 200, 200, 200);
52. return $this->mCheckImage;
53. }
55. /**
56. *
57. * @brief 设置图片的干扰像素
58. *
59. */
60. private function SetDisturbColor()
61. {
62. for ($i=0;$i {
63. $this->mDisturbColor = imagecolorallocate ($this->mCheckImage, rand(0,255), rand(0,255), rand(0,255));
64. imagesetpixel($this->mCheckImage,rand(2,128),rand(2,38),$this->mDisturbColor);
65. }
66. }
68. /**
69. *
70. * @brief 设置验证码图片的大小
71. *
72. * @param $width 宽
73. *
74. * @param $height 高
75. *
76. */
77. public function SetCheckImageWH($width,$height)
78. {
79. if($width==''||$height=='')return false;
80. $this->mCheckImageWidth = $width;
81. $this->mCheckImageHeight = $height;
82. return true;
83. }
85. /**
86. *
87. * @brief 在验证码图片上逐个画上验证码
88. *
89. */
90. private function WriteCheckCodeToImage()
91. {
92. for ($i=0;$imCheckCodeNum;$i++)
93. {
94. $bg_color = imagecolorallocate ($this->mCheckImage, rand(0,255), rand(0,128), rand(0,255));
95. $x = floor($this->mCheckImageWidth/$this->mCheckCodeNum)*$i;
96. $y = rand(0,$this->mCheckImageHeight-15);
97. imagechar ($this->mCheckImage, 5, $x, $y, $this->mCheckCode[$i], $bg_color);
98. }
99. }
101. /**
102. *
103. * @brief 输出验证码图片
104. *
105. */
106. public function OutCheckImage()
107. {
108. $this ->OutFileHeader();
109. $this ->CreateCheckCode();
110. $this ->CreateImage();
111. $this ->SetDisturbColor();
112. $this ->WriteCheckCodeToImage();
113. imagepng($this->mCheckImage);
114. imagedestroy($this->mCheckImage);
115. }
116. }
117. $c_check_code_image = new CCheckCodeFile();
118. //$c_check_code_image ->SetCheckImageWH(100,50);//设置显示验证码图片的尺寸
119. $c_check_code_image ->OutCheckImage();
120. ?>

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验证码, PHP