为什么不满足条件还是进入if输出了用户名格式异常QAQ

$posts=$_POST;

foreach($posts as $key => $value){

	if(empty($value))

		exit('非法访问!');

}

foreach ($posts as $key => $value) {

	$posts[$key] = trim($value);

}

require ('dbconfig.php');

//注册

function register($username,$password,$email){

	$query = "insert userdata values('". $username ."','". $password ."','". $email. "')";

	$result=mysql_query($query);

	if(!$result){

		exit('注册失败!papap');

		//die('注册失败'.  mysql_error());

	}

	else{

		echo "注册成功!";

	}

}

//检查用户名，密码，邮箱格式

function verifyFormat($username,$password,$email){

	$result1=preg_match("/^[\x{4e00}-\x{9fa5}]+$/u", $username);

	if(strlen($username)<1 || strlen($username)>16 || result1==0){

		echo "用户名格式错误!";

		return false;

		//die("用户名格式错误!");

	}



	$result2=preg_match("/^\w+$/u", $password);

	if(strlen($password)<6 || strlen($password)>17 || result2==0){

		echo "密码格式错误!";

		return false;

		//die("密码格式错误!");

	}

	

	$result3=preg_match("/^[a-zA-Z\d]+@[a-zA-Z\d]+\.[com|cn|com.cn|net]+$/u", $email);

	if(result3==0){

		echo "邮箱格式错误!";

		return false;

		//die("邮箱格式错误!");

	}

	return true;

}

$flag=verifyFormat($posts['username'],$posts['password'], $posts['email']);

if($flag)

	register($posts['username'],$posts['password'], $posts['email']);

else

	die("注册失败!!..");

?>