php多条件外加查询

<?<br />
header("Content-Type:text/html;charset=utf-8");<br />
include("../manage/include/function.php");<br />
	$brand=substr($_POST["brand"],0,strlen($_POST["brand"])-1); <br />
	$color=substr($_POST["color"],0,strlen($_POST["color"])-1); <br />
	$caizhi=$_POST["caizhi"];<br />
	$style=$_POST["style"];<br />
	$kucun=$_POST["kucun"];<br />
	echo($brand."</br>");<br />
	echo($color."</br>");<br />
	echo($caizhi."</br>");<br />
	echo($style."</br>");<br />
	echo($kucun);<br />
	<br />
	$q="select * from pros_pro where (1=1)";<br />
	if($brand!=null){<br />
		$q=$q+"and psp_brand in(".$brand.")";<br />
	}<br />
	if($color!=null){<br />
		$q=$q+"and psp_color in(".$color.")";<br />
	}<br />
	if($caizhi!=null){<br />
		$q=$q+"and psp_caizhi='".$caizhi."'";<br />
	}<br />
	if($style!=null){<br />
		$q=$q+"and psp_style='".$style."'";<br />
	}<br />
	if($kucun!=null){<br />
		$q=$q+"order by psp_stock desc";<br />
	}else<br />
	{<br />
		$q=$q+"order by psp_id desc";<br />
	}<br />
	<br />
<br />
	$rows=query($q);<br />
	if($row=mysql_fetch_array($rows))<br />
	{<br />
		do{<br />
?><br />
			<td align='right'><div align='center'><?php echo $row['psp_name'];?></div></td><br />
	<?    }while($row=mysql_fetch_array($rows));<br />
	}<br />
	else<br />
	{?><br />
		<td align='right'><div align='center'>没有符合条件的信息，请重新定义搜索条件!</div></td><br />
	<?<br />
	}<br />
	?>