bp_core_get_post_id_by_slug( $slug )

	function bp_core_get_post_id_by_slug( $slug ) {
		$post_id = array();
		$args    = array(
			'posts_per_page' => 1,
			'post_type'      => 'docs',
			'name'           => $slug,
			'post_parent'    => 0,
		);
		$docs    = get_posts( $args );
		if ( ! empty( $docs ) ) {
			foreach ( $docs as $doc ) {
				$post_id[] = $doc->ID;
			}
		}

		return $post_id;
	}