该如何清空$_POST里的数据？

	
		
					
				
					
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.error {color: red;}';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'";				echo $q;				$result = mysql_query($q);				if(!$result || mysql_num_rows($result) == 0)		{			print '
Wrong Username or Password.
';		}		else		{			$row = mysql_fetch_array($result);			$id = $row['USER_ID'];			$name = $row['USER_NAME'];			echo "User ID is ".$id;						session_start();			$_SESSION['$id'] = $id;						//clear the POST array				$_POST = array();   //网上找来的办法， 但貌似不管用					}			}	else	{		print '
Please try again!
';	}		}?>

回复讨论(解决方案)

PHP code?12345678 input type=text 是单行文本编辑器
如果你给他的是多行的文本，那么只有第一行可以被编辑。这就是你遇到的问题的原因

怎么会有这种事？？？

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我是来学习的

可能是 你post 赋值时有问题,post 的值只会覆盖上一个,怎么会附加呢..