对象来编写的验证码类

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code_len;$i++ ){
            $code .= $this->code_str[mt_rand(0, strlen($this->code_str)-1)];
    }
        return $this->code = $code;
    }
    
    //输出图像
    public function getImage(){
        $w = $this->width;
        $h = $this->height;
        $bg_color = $this->bg_color;
        $img = imagecreatetruecolor($w, $h);
        $bg_color = imagecolorallocate($img, 
	hexdec(substr($bg_color, 1,2)), hexdec(substr($bg_color, 3,2)), hexdec(substr($bg_color, 5,2)));
	imagefill($img, 0, 0, $bg_color);
        $this->img = $img;
        $this->create_font();
        $this->create_pix();
	$this->show_code();
    }


    //写入验证码
    public function create_font(){
        $this->create_code();
        $color = $this->font_color;
        $font_color = imagecolorallocate($this->img, hexdec(substr($color,1,2)), hexdec(substr($color, 3,2)), hexdec(substr($color,5,2)));
        $x = $this->width/$this->code_len;
        for( $i=0;$icode_len;$i++ ){
            $txt_color = imagecolorallocate($this->img, mt_rand(0,100), mt_rand(0, 150), mt_rand(0, 200));
            imagettftext($this->img, $this->font_size, mt_rand(-30, 30), $x*$i+mt_rand(3, 6), mt_rand($this->height/1.2, $this->height), $txt_color,  $this->font , $this->code[$i]);  
            //imagestring($this->img, $this->font_size, $x*$i+mt_rand(3, 6),mt_rand(0, $this->height/4) , $this->code[$i], $font_color);
        }
        $this->font_color = $font_color;
    }
    
    //画干扰线
    public function create_pix(){
        $pix_color= $this->font_color;
		for($i=0;$iimg, mt_rand(0, $this->width),mt_rand(0, $this->height), $pix_color);
		}
		for($j=0;$jimg, mt_rand(1, 2));
			imageline($this->img, mt_rand(0, $this->width), mt_rand(0, $this->height),  mt_rand(0, $this->width), mt_rand(0, $this->height), $pix_color);
		}
    }
    
    //得到验证码
    public function getCode(){
        return strtoupper($this->code);
    }


    //输出验证码
    private function show_code(){
		header("Content-type:image/png");
		imagepng($this->img);
		imagedestroy($this->img);
	}
}