FIND_IN_SET in cakephp not working

I have a table in which category ids are stored in the DB as comma separated values, so I need to search another array in this comma separated values.

Need to search $required_ids_array in Posts.category_ids

$required_ids_array = Array (
        [0] => 14 
        [1] => 15 
        [2] => 16 
        [3] => 25 
        [4] => 35 
);


if(isset($required_ids_array)){
    foreach ($required_ids_array as  $storeId) {
        $condition = array ();
        $condition ['AND'] ['Post.status']=1;
        $blogs = $this->Post->find('all', array(
                'conditions' => $condition,
                'order' => 'Post.id.DESC',
                'limit'=>'4',
                'FIND_IN_SET(\''.$storeId.'\',Post.category_ids)')
        );
    }

Thanks in advance

This solution worked for me :)

$blogs = $this->Post->find ( 'all', array (
                                    'conditions' => array (
                                    'Post.status' => 1,
                                    'Post.id !=' => $id,
                                    'FIND_IN_SET(?, Post.category_ids)' => array ($storeId) ),
                            'limit' => 4,
                            'order' => 'Blog.modified DESC'  
                    ) );