get_all_page_ids() WordPress Function

The get_all_page_ids() function is a simple way to get an array of all the post IDs for all the pages on your site. This can be useful for a number of different things, such as making sure that a certain piece of code is only run on pages, or getting a list of all the pages in a particular order.

get_all_page_ids() #

function get_all_page_ids() {
	global $wpdb;

	$page_ids = wp_cache_get( 'all_page_ids', 'posts' );
	if ( ! is_array( $page_ids ) ) {
		$page_ids = $wpdb->get_col( "SELECT ID FROM $wpdb->posts WHERE post_type = 'page'" );
		wp_cache_add( 'all_page_ids', $page_ids, 'posts' );
	}

	return $page_ids;
}