该怎么清空$_POST里的数据

	

		


		

			





				

					
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require_once 'connectDB.php';



print '';



if($_SERVER['REQUEST_METHOD']=='POST')

{

	$problem = false;

	$login = false;



	if(empty($_POST['user_name']))

	{

		$problem = true;

		print '
Please enter your user name!
';

	}

	if(empty($_POST['password']))

	{

		$problem = true;

		print '
Please enter a password
';

	}



	if(!$problem)

	{

		$user = trim(stripslashes($_POST['user_name']));

		$pwd = trim(stripslashes($_POST['password']));

		$user = mysql_real_escape_string($user);

		$pwd = mysql_real_escape_string($pwd);

		

		$q = "SELECT * FROM USER WHERE USER_NAME = '$user' and PASSWORD = '$pwd'";