php验证码图片

<?phpsession_start ();$data = array(	dirname(__FILE__).'\pics\pic0.jpg'=>'狗',	dirname(__FILE__).'\pics\pic1.jpg'=>'猫',	dirname(__FILE__).'\pics\pic2.jpg'=>'鱼',	dirname(__FILE__).'\pics\pic3.jpg'=>'猪',	dirname(__FILE__).'\pics\pic4.jpg'=>'马',	dirname(__FILE__).'\pics\pic5.jpg'=>'驴',	dirname(__FILE__).'\pics\pic6.jpg'=>'鸟',	dirname(__FILE__).'\pics\pic7.jpg'=>'鸡',	dirname(__FILE__).'\pics\pic8.jpg'=>'鸭',	dirname(__FILE__).'\pics\pic9.jpg'=>'象',	);$rnd = rand(0,9);$img = dirname(__FILE__).'\pics\pic'.$rnd.'.jpg';$_SESSION['authcode'] = $data[$img];$content = file_get_contents($img);header("content-type: image/png");echo $content;

<?phpif (isset($_REQUEST['authcode'])){	session_start();	if(($_REQUEST['authcode']) == $_SESSION['authcode']){		echo '<font color="#0000cc">输入正确';	}else{		echo '<font color="#cc0000"><b>输入错误</b></font>';	}	exit();}?>	<title></title>