wp_cache_get_last_changed( string $group )

Get last changed date for the specified cache group.

Parameters

$group

(string) (Required) Where the cache contents are grouped.

Return

(string) $last_changed UNIX timestamp with microseconds representing when the group was last changed.

Source

File: wp-includes/functions.php 

function wp_cache_get_last_changed( $group ) {
	$last_changed = wp_cache_get( 'last_changed', $group );

	if ( ! $last_changed ) {
		$last_changed = microtime();
		wp_cache_set( 'last_changed', $last_changed, $group );
	}

	return $last_changed;
}

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Related

Uses

Uses
Uses Description
wp-includes/cache.php: wp_cache_get()

Retrieves the cache contents from the cache by key and group.
wp-includes/cache.php: wp_cache_set()

Saves the data to the cache.

Used By

Used By
Used By Description
wp-includes/general-template.php: wp_get_archives()

Display archive links based on type and format.
wp-includes/class-wp-network-query.php: WP_Network_Query::get_networks()

Gets a list of networks matching the query vars.
wp-includes/class-wp-term-query.php: WP_Term_Query::get_terms()

Get terms, based on query_vars.
wp-includes/post.php: get_pages()

Retrieve a list of pages (or hierarchical post type items).
wp-includes/post.php: get_page_by_path()

Retrieves a page given its path.
wp-includes/class-wp-site-query.php: WP_Site_Query::get_sites()

Retrieves a list of sites matching the query vars.
wp-includes/class-wp-comment-query.php: WP_Comment_Query::get_comments()

Get a list of comments matching the query vars.
wp-includes/class-wp-comment-query.php: WP_Comment_Query::fill_descendants()

Fetch descendants for located comments.
wp-includes/taxonomy.php: get_objects_in_term()

Retrieve object_ids of valid taxonomy and term.
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Changelog

Changelog
Version Description
WP-4.7.0 Introduced.