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:

Tags: php验证码图片 php验证码程序

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