1. <?php
2. /*
3. *文件名:class.safeCode.php
4. *类名:safeCode
5. *目的:生成web应用时所需的验证码图片
6. *当前版本:1.0.2
7. *作者:NoAngels
8. *联系方式:flare_1023@163.com QQ:82535599 MSN:atizu@hotmail.com
9. *更新内容:
10. *版本1.0.2
11. *1.更新了对linux主机支持,设置GDFONTPATH环境变量,
12. * putenv('GDFONTPATH=' . realpath('.'));
13. *2.对不支持antialias函数的时候避免采用此方法,避免低版本的GD库
14. *版本1.0.1
15. *1.更新了绘制指定类型图片,支持类型有:png,jpeg,gif.默认为png(此效果最佳)
16. *2.优化了部分代码
17. */
18. class safeCode{
19. function __construct(){
20. #设置默认safe安全保护码
21. $this->__safe = substr(md5(time()), 0 , 4);
22. }
23. function __destruct(){
24. #释放资源
25. unset($this->__img, $this->__canvasWidth, $this->__canvasHeight, $this->__codeLength, $this->__spacePerChar, $this->__code, $this->__safe, $this->__background, $this->__borderColor, $this->__colors, $this->__font, $this->__sessionName);
26. }
27. function setCanvas($width = 200, $height = 60){
28. #设置画布宽度以及高度.有默认值
29. $this->__canvasWidth = $width;
30. $this->__canvasHeight = $height;
31. $this->__img = imagecreatetruecolor($width, $height);
32. return;
33. }
34. function setSafe($char){
35. #设置安全码,不调用系统会自己设置
36. $this->__safe = $char;
37. return;
38. }
39. function setCodeLength($num = 8){
40. #设置验证码长度
41. $this->__codeLength = $num;
42. }
43. function setFont($fontName){
44. #设置绘图时所用的字体,字体文件必须与类文件同目录
45. $this->__font = $fontName;
46. return;
47. }
48. function setBackground($arg1 = 255, $arg2 = 255, $arg3 = 255){
49. #设置背景颜色
50. $this->__background = imagecolorallocate($this->__img, $arg1, $arg2, $arg3);
51. return;
52. }
53. function setBorderColor($arg1 = 128, $arg2 = 128, $arg3 = 128){
54. #设置边框颜色
55. $this->__borderColor = imagecolorallocate($this->__img, $arg1, $arg2, $arg3);
56. }
57. function setFontColor($arr){
58. #设置绘图时所用颜色,参数为颜色集合数组
59. foreach($arr as $color){
60. $this->__colors[] = imagecolorallocate($this->__img, $color[0], $color[1], $color[2]);
61. }
62. return;
63. }
64. function setSession($sessionName = 'safeCode'){
65. #设置session变量名,默认为$_SESSION['safeCode']
66. $this->__sessionName = $sessionName;
67. #$_SESSION[$sessionName] = $this->__code;
68. return;
69. }
70. function display($type = 'png'){
71. #显示图片,可指定显示类型,目前支持png(默认),jpeg,gif
72. $this->__setSpacePerChar();
73. imagefilledrectangle($this->__img, 1, 1, $this->__canvasWidth - 2, $this->__canvasHeight -2, $this->__background);
74. imagerectangle($this->__img, 0, 0, $this->__canvasWidth - 1, $this->__canvasHeight - 1, $this->__borderColor);
75. $this->__drawText($this->__colors, $this->__getCode(), $this->__font);
76. #修正linux以及低版本的GD库问题
77. if(function_exists(imageantialias)){
78. imageantialias($this->__img, true);
79. }
80. $_SESSION[$this->__sessionName] = $this->__code;
81. switch ($type){
82. case 'png':
83. header('Content-type:image/png');
84. imagepng($this->__img);
85. case 'jpeg':
86. header('Content-type:image/jpeg');
87. imagejpeg($this->__img, '' , 75);
88. case 'gif':
89. header('Content-type:image/gif');
90. imagegif($this->__img);
91. default:
92. header('Content-type:image/png');
93. imagepng($this->__img);
94. }
95. imagegif($this->__img);
96. }
97. private function __setSpacePerChar(){
98. #私有函数,设置字符间隔
99. $this->__spacePerChar = $this->__canvasWidth / $this->__codeLength;
100. return;
101. }
102. private function __getCode(){
103. #获取验证码
104. $this->__code = substr(md5(time().$this->__safe), rand(0, 24), $this->__codeLength);
105. return $this->__code;
106. }
107. private function __drawText($colors, $code, $fontName){
108. #开始绘图
109. #设置GBFONTPATH为当前目录,不然linux环境下会报错
110. putenv('GDFONTPATH=' . realpath('.'));
111. for($i = 0; $i < strlen($code); $i++){
112. $color = $colors[$i % count($colors)];
113. imagettftext(
114. $this->__img,
115. 24 + rand(0, 8),
116. -20 + rand(0, 40),
117. ($i + 0.3) * $this->__spacePerChar,
118. $this->__canvasHeight - 20 + rand(0, 20),
119. $color,
120. $fontName,
121. $code{$i}
122. );
123. }
124. #绘制随机实线
125. for($i = 0; $i < 400; $i++){
126. $x1 = rand(5, $this->__canvasWidth - 5);
127. $y1 = rand(5, $this->__canvasHeight - 5);
128. $x2 = $x1 - 4 + rand(0, 8);
129. $y2 = $y1 - 4 + rand(0, 8);
130. imageline($this->__img, $x1, $y1, $x2, $y2, $this->__colors[rand(0, count($this->__colors) - 1)]);
131. }
132. return;
133. }//开源代码phpfensi.com
134. private $__img = NULL;
135. private $__canvasWidth = 120;
136. private $__canvasHeight = 80;
137. private $__codeLength = 8;
138. private $__spacePerChar = 0;
139. private $__code = 12345678;
140. private $__safe = 2008;
141. private $__background = NULL;
142. private $__borderColor = NULL;
143. private $__colors = array();
144. private $__font = 'arial.ttf';
145. private $__sessionName = '';
146. }
147. ?>

使用方法,代码如下: