preg_replace() コードが文字化けする

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