WP_check_user_access

function check_user_access( $p = null, $user_id = null ) {
    if(empty($p))
        $id = get_the_ID();
    else
        $id = is_string($p)?url_to_postid( $p ):$p;

    $access =  get_post_meta( $id, 'meta_restricting_access' );
    if(is_array($access[0]) && !empty($access[0])) {
        foreach($access[0] as $a) {
            if(check_user_role($a, $user_id))
                return true;
        }
        return false;
    }
    return true;
}