[php]php做的图片验证码类实例源代码

[php]php做的图片验证码类实例源代码

<?php   
//验证码类   
class ValidateCode {   
private $charset = 'abcdefghkmnprstuvwxyzABCDEFGHKMNPRSTUVWXYZ23456789';    //随机因子   
    private $code;                            //验证码   
    private $codelen = 4;                    //验证码长度   
    private $width = 130;                    //宽度   
    private $height = 50;                    //高度   
    private $img;                                //图形资源句柄   
    private $font;                                //指定的字体   
    private $fontsize = 20;                //指定字体大小   
    private $fontcolor;                        //指定字体颜色   
   
   
    //构造方法初始化   
    public function __construct() {   
        $this->font = ROOT_PATH.'/font/elephant.ttf';   
    }   
   
   
    //生成随机码   
    private function createCode() {   
        $_len = strlen($this->charset)-1;   
        for ($i=0;$i<$this->codelen;$i++) {   
            $this->code .= $this->charset[mt_rand(0,$_len)];   
        }   
    }   
   
   
    //生成背景   
    private function createBg() {   
        $this->img = imagecreatetruecolor($this->width, $this->height);   
        $color = imagecolorallocate($this->img, mt_rand(157,255), mt_rand(157,255), mt_rand(157,255));   
        imagefilledrectangle($this->img,0,$this->height,$this->width,0,$color);   
    }   
   
   
    //生成文字   
    private function createFont() {       
        $_x = $this->width / $this->codelen;   
        for ($i=0;$i<$this->codelen;$i++) {   
            $this->fontcolor = imagecolorallocate($this->img,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156));   
            imagettftext($this->img,$this->fontsize,mt_rand(-30,30),$_x*$i+mt_rand(1,5),$this->height / 1.4,$this->fontcolor,$this->font,$this->code[$i]);   
        }   
    }   
   
   
    //生成线条、雪花   
    private function createLine() {   
        for ($i=0;$i<6;$i++) {   
            $color = imagecolorallocate($this->img,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156));   
            imageline($this->img,mt_rand(0,$this->width),mt_rand(0,$this->height),mt_rand(0,$this->width),mt_rand(0,$this->height),$color);   
        }   
        for ($i=0;$i<100;$i++) {   
            $color = imagecolorallocate($this->img,mt_rand(200,255),mt_rand(200,255),mt_rand(200,255));   
            imagestring($this->img,mt_rand(1,5),mt_rand(0,$this->width),mt_rand(0,$this->height),'*',$color);   
        }   
    }   
   
   
    //输出   
    private function outPut() {   
        header('Content-type:image/png');   
        imagepng($this->img);   
        imagedestroy($this->img);   
    }   
   
   
    //对外生成   
    public function doimg() {   
        $this->createBg();   
        $this->createCode();   
        $this->createLine();   
        $this->createFont();   
        $this->outPut();   
    }   
   
   
    //获取验证码   
    public function getCode() {   
        return strtolower($this->code);   
    }   
}