php验证码封装类一例

ewayfly

一个实现验证码的封装类，实现的功能强大而实用。
验证码类，validationcode.class.php

1. 
   
2. <?php
   
3. /**
   
4. * 验证码类
   
5. * edit www.jbxue.com
   
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. 
    
21. if($number > 240-$codeNum){
    
22. $this->disturbColorNum= 240-$codeNum;
    
23. }else{
    
24. $this->disturbColorNum=$number;
    
25. }
    
26. 
    
27. }
    
28. //通过访问该方法向浏览器中输出图像
    
29. function showImage($fontFace=""){
    
30. //第一步：创建图像背景
    
31. $this->createImage();
    
32. //第二步：设置干扰元素
    
33. $this->setDisturbColor();
    
34. //第三步：向图像中随机画出文本
    
35. $this->outputText($fontFace);
    
36. //第四步：输出图像
    
37. $this->outputImage();
    
38. }
    
39. 
    
40. //通过调用该方法获取随机创建的验证码字符串
    
41. function getCheckCode(){
    
42. return $this->checkCode;
    
43. }
    
44. private function createImage(){
    
45. //创建图像资源 //www.jbxue.com
    
46. $this->image=imagecreatetruecolor($this->width, $this->height);
    
47. //随机背景色
    
48. $backColor=imagecolorallocate($this->image, rand(225, 255), rand(225,255), rand(225, 255));
    
49. //为背景添充颜色
    
50. imagefill($this->image, 0, 0, $backColor);
    
51. //设置边框颜色
    
52. $border=imagecolorallocate($this->image, 0, 0, 0);
    
53. //画出矩形边框
    
54. imagerectangle($this->image, 0, 0, $this->width-1, $this->height-1, $border);
    
55. }
    
56. private function setDisturbColor(){
    
57. for($i=0; $i<$this->disturbColorNum; $i++){
    
58. $color=imagecolorallocate($this->image, rand(0, 255), rand(0, 255), rand(0, 255));
    
59. imagesetpixel($this->image, rand(1, $this->width-2), rand(1, $this->height-2), $color);
    
60. }
    
61. for($i=0; $i<10; $i++){
    
62. $color=imagecolorallocate($this->image, rand(200, 255), rand(200, 255), rand(200, 255));
    
63. imagearc($this->image, rand(-10, $this->width), rand(-10, $this->height), rand(30, 300), rand(20, 200), 55, 44, $color);
    
64. }
    
65. }
    
66. private function createCheckCode(){
    
67. //这里主要产生随机码，从2开始是为了区分1和l
    
68. $code="23456789abcdefghijkmnpqrstuvwxyzABCDEFGHIJKMNPQRSTUVWXYZ";
    
69. $string='';
    
70. for($i=0; $i < $this->codeNum; $i++){
    
71. $char=$code{rand(0, strlen($code)-1)};
    
72. $string.=$char;
    
73. }
    
74. return $string;
    
75. }
    
76. private function outputText($fontFace=""){
    
77. for($i=0; $i<$this->codeNum; $i++){
    
78. $fontcolor=imagecolorallocate($this->image, rand(0, 128), rand(0, 128), rand(0, 128));
    
79. if($fontFace==""){
    
80. $fontsize=rand(3, 5);
    
81. $x=floor($this->width/$this->codeNum)*$i+3;
    
82. $y=rand(0, $this->height-15);
    
83. imagechar($this->image,$fontsize, $x, $y, $this->checkCode{$i},$fontcolor);
    
84. }else{
    
85. $fontsize=rand(12, 16);
    
86. $x=floor(($this->width-8)/$this->codeNum)*$i+8;
    
87. $y=rand($fontSize+5, $this->height);
    
88. imagettftext($this->image,$fontsize,rand(-30, 30),$x,$y ,$fontcolor, $fontFace, $this->checkCode{$i});
    
89. }
    
90. }
    
91. }
    
92. 
    
93. //输出图象信息
    
94. private function outputImage() {
    
95. if(imagetypes() & IMG_GIF){
    
96. header("Content-Type:image/gif");
    
97. imagepng($this->image);
    
98. }else if(imagetypes() & IMG_JPG){
    
99. header("Content-Type:image/jpeg");
    
100. imagepng($this->image); //www.jbxue.com
     
101. }else if(imagetypes() & IMG_PNG){
     
102. header("Content-Type:image/png");
     
103. imagepng($this->image);
     
104. }else if(imagetypes() & IMG_WBMP){
     
105. header("Content-Type:image/vnd.wap.wbmp");
     
106. imagepng($this->image);
     
107. }else{
     
108. die("PHP不支持图像创建");
     
109. }
     
110. }
     
111. function __destruct(){
     
112. imagedestroy($this->image);
     
113. }
     
114. }
     
115. ?>

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