一个php验证码的封装类

3. /**

4. * 验证码类
5. * edit bbs.it-home.org
6. */
7. class ValidationCode {
8. private $width;
9. private $height;
10. private $codeNum;
11. private $image; //图像资源
12. private $disturbColorNum;
13. private $checkCode;
14. function __construct($width=80, $height=20, $codeNum=4){
15. $this->width=$width;
16. $this->height=$height;
17. $this->codeNum=$codeNum;
18. $this->checkCode=$this->createCheckCode();
19. $number=floor($width*$height/15);

20. if($number > 240-$codeNum){

21. $this->disturbColorNum= 240-$codeNum;
22. }else{
23. $this->disturbColorNum=$number;
24. }

25. }

26. //通过访问该方法向浏览器中输出图像
27. function showImage($fontFace=""){
28. //第一步：创建图像背景
29. $this->createImage();
30. //第二步：设置干扰元素
31. $this->setDisturbColor();
32. //第三步：向图像中随机画出文本
33. $this->outputText($fontFace);
34. //第四步：输出图像
35. $this->outputImage();
36. }

37. //通过调用该方法获取随机创建的验证码字符串

38. function getCheckCode(){
39. return $this->checkCode;
40. }
41. private function createImage(){
42. //创建图像资源 //bbs.it-home.org
43. $this->image=imagecreatetruecolor($this->width, $this->height);
44. //随机背景色
45. $backColor=imagecolorallocate($this->image, rand(225, 255), rand(225,255), rand(225, 255));
46. //为背景添充颜色
47. imagefill($this->image, 0, 0, $backColor);
48. //设置边框颜色
49. $border=imagecolorallocate($this->image, 0, 0, 0);
50. //画出矩形边框
51. imagerectangle($this->image, 0, 0, $this->width-1, $this->height-1, $border);
52. }
53. private function setDisturbColor(){
54. for($i=0; $i<$this->disturbColorNum; $i++){
55. $color=imagecolorallocate($this->image, rand(0, 255), rand(0, 255), rand(0, 255));
56. imagesetpixel($this->image, rand(1, $this->width-2), rand(1, $this->height-2), $color);
57. }
58. for($i=0; $i<10; $i++){
59. $color=imagecolorallocate($this->image, rand(200, 255), rand(200, 255), rand(200, 255));
60. imagearc($this->image, rand(-10, $this->width), rand(-10, $this->height), rand(30, 300), rand(20, 200), 55, 44, $color);
61. }
62. }
63. private function createCheckCode(){
64. //这里主要产生随机码，从2开始是为了区分1和l
65. $code="23456789abcdefghijkmnpqrstuvwxyzABCDEFGHIJKMNPQRSTUVWXYZ";
66. $string='';
67. for($i=0; $i < $this->codeNum; $i++){
68. $char=$code{rand(0, strlen($code)-1)};
69. $string.=$char;
70. }
71. return $string;
72. }
73. private function outputText($fontFace=""){
74. for($i=0; $i<$this->codeNum; $i++){
75. $fontcolor=imagecolorallocate($this->image, rand(0, 128), rand(0, 128), rand(0, 128));
76. if($fontFace==""){
77. $fontsize=rand(3, 5);
78. $x=floor($this->width/$this->codeNum)*$i+3;
79. $y=rand(0, $this->height-15);
80. imagechar($this->image,$fontsize, $x, $y, $this->checkCode{$i},$fontcolor);
81. }else{
82. $fontsize=rand(12, 16);
83. $x=floor(($this->width-8)/$this->codeNum)*$i+8;
84. $y=rand($fontSize+5, $this->height);
85. imagettftext($this->image,$fontsize,rand(-30, 30),$x,$y ,$fontcolor, $fontFace, $this->checkCode{$i});
86. }
87. }
88. }

89. //输出图象信息

90. private function outputImage() {
91. if(imagetypes() & IMG_GIF){
92. header("Content-Type:image/gif");
93. imagepng($this->image);
94. }else if(imagetypes() & IMG_JPG){
95. header("Content-Type:image/jpeg");
96. imagepng($this->image); //bbs.it-home.org
97. }else if(imagetypes() & IMG_PNG){
98. header("Content-Type:image/png");
99. imagepng($this->image);
100. }else if(imagetypes() & IMG_WBMP){
101. header("Content-Type:image/vnd.wap.wbmp");
102. imagepng($this->image);
103. }else{
104. die("PHP不支持图像创建");
105. }
106. }
107. function __destruct(){
108. imagedestroy($this->image);
109. }
110. }
111. ?>

验证码类的调用示例：

2. session_start();
3. include "validationcode.class.php";
4. $code=new ValidationCode(80, 20, 4);
5. $code->showImage(); //输出到页面中供 注册或登录使用
6. $_SESSION["code"]=$code->getCheckCode(); //将验证码保存到服务器中
7. ?>