收藏一个比较美观的PHP验证码类_PHP教程

codes = implode('',array_slice($codeArray,0,4));
        }
		
        public function CreateImg()
        {
            $_SESSION['check_pic'] = $this->codes;
            $img = imagecreate(70,25);
            imagecolorallocate($img,222,222,222);
            $testcolor1 = imagecolorallocate($img,255,0,0);
            $testcolor2 = imagecolorallocate($img,51,51,51);
            $testcolor3 = imagecolorallocate($img,0,0,255);
            $testcolor4 = imagecolorallocate($img,255,0,255);
			
            for ($i = 0; $i < 4; $i++)
            {
                imagestring($img,rand(5,6),8 + $i * 15,rand(2,8),$this->codes[$i],rand(1,4));
            }
            imagegif($img);
        }
    }
	
    $code = new SecurityCode();
    $code->CreateImg();
	
	$code = NULL;
?>