为什么不满足条件 还是进入if 输出了用户名格式异常QAQ

<br /><?php<br />$posts=$_POST;<br />foreach($posts as $key => $value){<br />	if(empty($value))<br />		exit('非法访问!');<br />}<br />foreach ($posts as $key => $value) {<br />	$posts[$key] = trim($value);<br />}<br />require ('dbconfig.php');<br />//注册<br />function register($username,$password,$email){<br />	$query = "insert userdata values('". $username ."','". $password ."','". $email. "')";<br />	$result=mysql_query($query);<br />	if(!$result){<br />		exit('注册失败!papap');<br />		//die('注册失败'.  mysql_error());<br />	}<br />	else{<br />		echo "注册成功!";<br />	}<br />}<br />//检查用户名，密码，邮箱格式<br />function verifyFormat($username,$password,$email){<br />	$result1=preg_match("/^[\x{4e00}-\x{9fa5}]+$/u", $username);<br />	if(strlen($username)<1 || strlen($username)>16 || result1==0){<br />		echo "用户名格式错误!";<br />		return false;<br />		//die("用户名格式错误!");<br />	}<br /><br />	$result2=preg_match("/^\w+$/u", $password);<br />	if(strlen($password)<6 || strlen($password)>17 || result2==0){<br />		echo "密码格式错误!";<br />		return false;<br />		//die("密码格式错误!");<br />	}<br />	<br />	$result3=preg_match("/^[a-zA-Z\d]+@[a-zA-Z\d]+\.[com|cn|com.cn|net]+$/u", $email);<br />	if(result3==0){<br />		echo "邮箱格式错误!";<br />		return false;<br />		//die("邮箱格式错误!");<br />	}<br />	return true;<br />}<br />$flag=verifyFormat($posts['username'],$posts['password'], $posts['email']);<br />if($flag)<br />	register($posts['username'],$posts['password'], $posts['email']);<br />else<br />	die("注册失败!!..");<br />?><br />