Quin452

//  What were searching for
$args = array(
    'post_type' => $post_type,
    'post_status' => 'publish'
);

//  Now, if the category has been selected AND it doesn't equal the "show all" value
if(isset($_POST['category']) && $_POST['category'] != -1) {
    //  Explode the string into an array
    $categories = array_map('intval', explode(',', $_POST['category']));