Sending multiple values from php to ajax - php

Question

I am trying to send 2 values from different parts of a page to the same ajax function. Basically, it's a search filter wherein selecting categories is one module and selecting brands is another both of which are attributes of a product and independent of each other.
I need 3 conditions where search is performed either
only if brand is selected or
only if cat is selected or
if both are selected.
My issue is 1 and 3 are working. but 2nd condition isn't as it takes the cat value as the brand. Please help me correct my function.
My AJAX function:
function filter(subid) {
alert(subid);
var brand_filter = new Array();
$("input:checked").each(function() {
brand_filter.push($(this).val());
});
$.ajax({
type: 'POST',
url: 'getSubcategoryProducts.php',
data: {
brand_filter:brand_filter,
subId: subid
},
success: function(data) {
//alert(data);
$('#productDetail').html(data).fadeIn('slow');
$('#sub_cat_menuItem a').addClass('.collection-category-brands li.active, .collection-category-brands li:hover');
}
});
}
Module of selecting brand:
<div class="collection-brands-filter">
<h4>Filter by Brands</h4>
<div class="brand-filter-form">
<form>
<?php $brandlist = $objBrands-> getAll("status=1");
foreach($brandlist as $branditem){
?>
<span><input type="checkbox" name="brand_filter[]" <?php if ('checked="checked"'){ ?> onClick="filter(<?php echo $branditem['id'];?>);" <?php } ?> value="<?php echo $branditem['id'];?>"/><?php echo $branditem['name'];?></span>
<?php } ?>
</form>
</div>
</div>
Module of selecting category:
<div class="collection-category-brands">
<ul>
<?php
//Fetching sub categories of the main_category
while($query2res = mysql_fetch_array($query2)){ ?>
<li id="sub_cat_menuItem"><?php echo $query2res['1'];?></li>
<?php $subId = $query2res['id'];}?>
</ul>
</div>
getSubcategoryProducts.php code:
<?php
include_once("class/site_root.php");
include('includes/connect.php');
include_once(DIR_ROOT."class/functions.php");
include_once(DIR_ROOT."class/products.php");
$objProducts = new products();
$subId = $_POST['subId'];
//IF ONLY BRAND IS SELECTED AND NOT SUB CATEGORY
if(isset($_POST['brand_filter'])&&!isset($_POST['subId']))
{
echo "only brand is selected";
foreach($_POST['brand_filter'] as $item)
{
$res = $objProducts->getAll('status=1 and brand_id='.$item);?>
<ul>
<?php foreach($res as $val){?>
<li>
<img src="<?php echo $val['img_small']; ?>" alt="icon"/>
<div class="collection-item-hover">
<div class="collection-category-detail">
Know More
<div class="collection-item-detail">
<h4><?php echo $val['product_name']; ?></h4>
<p><?php echo $val['descr_small']; ?></p>
</div>
</div>
</div>
</li>
<?php }?>
</ul>
<?php }
}
//IF ONLY SUB CATEGORY IS CHOSEN!
else if(isset($subId)&&!isset($_POST['brand_filter'])){
echo "only sub cat selected!";
$productsquery=mysql_query("SELECT products.product_name,products.id,products.main_id,
products.img_small,products.descr_small,sub_category.name
FROM products
LEFT JOIN sub_category on
products.sub_id=sub_category.id
WHERE sub_category.id=".$subId);
$count = mysql_num_rows($productsquery);
$subNameVal=mysql_fetch_array(mysql_query("select name from sub_category where id=".$subId));
?>
<h3><?php echo $subNameVal['name'];?></h3>
<?php
if($count>0)
{
?>
<ul>
<?php
while($productsRes=mysql_fetch_array($productsquery))
{
?>
<li>
<img src="<?php echo $productsRes['img_small']; ?>" alt="icon"/>
<div class="collection-item-hover">
<div class="collection-category-detail">
Know More
<div class="collection-item-detail">
<h4><?php echo $productsRes['product_name']; ?></h4>
<p><?php echo $productsRes['descr_small']; ?></p>
</div>
</div>
</div>
</li>
<?php }
?>
</ul>
<?php }
}
//IF BOTH ARE SELECTED
else //if(isset($_POST['brand_filter'])&&isset($subId))
{
echo "both selected!";
echo
"SUB-".$subId."<br/>";
foreach ($_POST['brand_filter'] as $item)
{
echo "brand-".$item."<br/>";
}
}
?>