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 file10         private $fontsize = 20;          //font size11         private $fontcolor;         //font color12         13         //the construct initialization14         public function __construct(){15             $this->font = ROOT_PATH.'/font/elephant.ttf';16         }17                 18         //create random code from $charset19         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 background27         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 font34         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,snowflake43         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), '*', $_color);51             }52         }53         54         //export image55         private function outPut(){56             header('Content-type:image/png');57             imagepng($this->img);58             imagedestroy($this->img);59         }60         61         //display62         public function doimg(){63             $this->createBg();64             $this->createCode();65             $this->createLine();66             $this->createFont();67             $this->outPut();68         }69         70         //get code71         public function getCode(){72             return strtolower($this->code);73         }74         75     }76