 <?php
function storeFilter($meta_query) {
   $i = new My_Internal_Class;
 
   $url = CRM_ROOT . "stores/getStoreCatalogue/" . $_GET["sid"];
   $cid = $i->chReq($url);
 
 	$meta_query[] = array(
 		'post_type'      => 'product',
     'meta_query'     => array(
       array(
         'key'     => '_product_attributes',
         'value'   => "_cid_$cid"."_",
         'compare' => 'LIKE',
         'type'    => 'product'
       )
     )
 	);
 	return $meta_query;
 }
 add_filter( 'woocommerce_product_query_meta_query', 'storeFilter', 9 );
 ?>

	<?php
	function storeFilter($meta_query) {
	$i = new My_Internal_Class;

	$url = CRM_ROOT . "stores/getStoreCatalogue/" . $_GET["sid"];
	$cid = $i->chReq($url);

	$meta_query[] = array(
	'post_type' => 'product',
	'meta_query' => array(
	array(
	'key' => '_product_attributes',
	'value' => "_cid_$cid"."_",
	'compare' => 'LIKE',
	'type' => 'product'
	)
	)
	);
	return $meta_query;
	}
	add_filter( 'woocommerce_product_query_meta_query', 'storeFilter', 9 );
	?>