PHP问题求助，请大神帮忙。

//refresh function//refresh item statusfunction refresh(){		$problem = false;	$result = mysql_query("SELECT ITEM_ID FROM ITEM WHERE END > NOW() AND STATUS != 'SOLD'");	if($result)	{			while ($row = mysql_fetch_array($result))		{			$act_id = $row['ITEM_ID'];			mysql_query("UPDATE ITEM SET STATUS = 'ACTIVE' WHERE ITEM_ID = $act_id");		}							$result = mysql_query("SELECT ITEM_ID, WINNER_ID, END FROM ITEM WHERE END <= NOW() AND STATUS != 'SOLD'");				if($result)		{					while ($row = mysql_fetch_array($result))			{				$exp_id = $row['ITEM_ID'];				$win_id = $row['WINNER_ID'];				$time = $row['END'];								// Error here. There is only one row has been displayed. There should be 4 rows actully.                 // Result:  7  0   2013-04-14 00:00:00 				echo $exp_id."<br>";				echo $win_id."<br>";				echo $time."<br>";								if($win_id == 0)				{					mysql_query("UPDATE ITEM SET STATUS = 'EXPIRE' WHERE ITEM_ID = $exp_id");				}				else				{					mysql_query("UPDATE ITEM SET STATUS = 'SOLD' WHERE ITEM_ID = $exp_id");					echo "INSERT INTO ITEM_SOLD VALUES($exp_id,$win_id,'".$time."','N')";					mysql_query("INSERT INTO ITEM_SOLD VALUES($exp_id,$win_id,'".$time."','N')");				}							}								$result = mysql_query("SELECT ITEM_ID FROM ITEM WHERE BEGIN > NOW() AND STATUS != 'SOLD'");						if($result)			{						while ($row = mysql_fetch_array($result))				{					$na_id = $row['ITEM_ID'];					mysql_query("UPDATE ITEM SET STATUS = 'NA' WHERE ITEM_ID = $na_id");				}			}			else			{				$problem = true;			}		}		else		{			$problem = true;		}	}	else	{		$problem = true;	}	if($problem)	{		print '<p class = "error">Cannot refresh active item.</p>';	}}