验证码类，php验证码类_PHP教程

验证码类，php验证码类

熟悉相关图像处理函数，简单的验证码类

 1     //code class
 2     class ValidateCode {
 3         private $charset = 'abcdefghkmnprstuvwxyzABCDEFGHKMNPRSTUVWXYZ23456789';    //random effects
 4         private $code;              //code  
 5         private $codelen = 4 ;      //code length
 6         private $width = 130;       //width
 7         private $heigth = 50;       //height
 8         private $img;               //image handle
 9         private $font;              //font file
10         private $fontsize = 20;          //font size
11         private $fontcolor;         //font color
12         
13         //the construct initialization
14         public function __construct(){
15             $this->fOnt= ROOT_PATH.'/font/elephant.ttf';
16         }
17                 
18         //create random code from $charset
19         private function createCode(){
20             $_len = strlen($this->charset);
21             for($i=1;$i<=$this->codelen;$i++){
22                 $this->code .= $this->charset[mt_rand(0,$_len)];
23             }
24         }
25         
26         //create background
27         private function createBg(){
28             $this->img = imagecreatetruecolor($this->width, $this->heigth);
29             $_color = imagecolorallocate($this->img, mt_rand(157,255), mt_rand(157,255), mt_rand(157,255));
30             imagefilledrectangle($this->img,0,0,$this->width,$this->heigth,$_color);
31         }
32         
33         //create font
34         private function createFont(){
35             $_x = $this->width / $this->codelen;
36             for($i=0;$i<$this->codelen;$i++){
37                 $this->fOntcolor= imagecolorallocate($this->img, mt_rand(0,156),  mt_rand(0,156),  mt_rand(0,156));
38                 imagettftext($this->img, $this->fontsize, mt_rand(-30,30), $_x*$i+mt_rand(1,5), $this->heigth/1.4, $this->fontcolor, $this->font, $this->code[$i]);
39             }
40         }
41         
42         //create line,snowflake
43         private function createLine(){
44             for($i=0;$i<6;$i++){
45                 $_color = imagecolorallocate($this->img, mt_rand(0,156),  mt_rand(0,156),  mt_rand(0,156));
46                 imageline($this->img, mt_rand(0,$this->width), mt_rand(0, $this->heigth),mt_rand(0,$this->width), mt_rand(0, $this->heigth), $_color);
47             }
48             for($i=0;$i<100;$i++){
49                 $_color = imagecolorallocate($this->img, mt_rand(157,255), mt_rand(157,255), mt_rand(157,255));
50                 imagestring($this->img, mt_rand(1, 5), mt_rand(0,$this->width), mt_rand(0,$this->heigth), '*', $_color);
51             }
52         }
53         
54         //export image
55         private function outPut(){
56             header('Content-type:image/png');
57             imagepng($this->img);
58             imagedestroy($this->img);
59         }
60         
61         //display
62         public function doimg(){
63             $this->createBg();
64             $this->createCode();
65             $this->createLine();
66             $this->createFont();
67             $this->outPut();
68         }
69         
70         //get code
71         public function getCode(){
72             return strtolower($this->code);
73         }
74         
75     }
76     

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