preg_replace() 乱码,该怎么处理

<br />$search_input=$_REQUEST["search_input"];<br />$search_input = preg_replace('/\s(?=\s)/','', $search_input);<br />$search_array=explode(" ",$search_input);<br /><br />	if (is_array($search_array)){<br />		$search_array=implode("|",$search_array);<br />	}<br />	$clientNumber=preg_replace("/($search_array)/i","<font style='color:#aa1234'>\\1</font>",$clientNumber);<br />	$clientTime=preg_replace("/($search_array)/i","<font style='color:#aa1234'>\\1</font>",$clientTime);<br /><br /><br /><br />echo "<div id='page_list_$i' class='page_default' url='./client_list.php?page=$i&search_list=$search_list&search_input=$search_input'>$i</div>";<br />