get_recent_post_ids() Gets an array of recent post IDs based on the number of posts. Contains caching mechanism for high-performance. ⚡️

functions.php

<?php

/**
 * Gets an array of recent post IDs based on the number of posts.
 *
 * @param int $num_posts The number of recent posts to retrieve. Defaults to 6.
 * @param int $expiration_time The expiration time for the cache, in seconds. Defaults to 1 hour.
 *
 * @return array An array of recent post IDs.
 */
function get_recent_post_ids( int $num_posts = 6, int $expiration_time = 1 * HOUR_IN_SECONDS ): array {
	$cache_key = 'recent_posts_' . $num_posts;

	$cached_post_ids = get_transient( $cache_key );

	if ( $cached_post_ids !== false ) {
		return $cached_post_ids;
	}

	$args = array(
		'numberposts'      => $num_posts,
		'fields'           => 'ids',
		'suppress_filters' => false,
	);
	
	// phpcs:ignore WordPressVIPMinimum.Functions.RestrictedFunctions.get_posts_get_posts
	$recent_post_ids = get_posts( $args );

	set_transient( $cache_key, $recent_post_ids, $expiration_time );

	return $recent_post_ids;
}