WordPress at a glance
function is not described

WP_Object_Cache::get() WP 2.0.0

Retrieves the cache contents, if it exists.

The contents will be first attempted to be retrieved by searching by the key in the cache group. If the cache is hit (success) then the contents are returned.

On failure, the number of cache misses will be incremented.

This is a method of the class: WP_Object_Cache

No Hooks.

Return

false/Mixed. False on failure to retrieve contents or the cache contents on success.

Usage

$WP_Object_Cache = new WP_Object_Cache();
$var = $WP_Object_Cache->get( $key, $group, $force, $found );
$key(int/string) (required)
What the contents in the cache are called.
$group(string)
Where the cache contents are grouped.
Default: 'default'
$force(true/false)
Unused. Whether to force a refetch rather than relying on the local cache.
Default: false
$found(true/false) (passed by reference — &)
Whether the key was found in the cache (passed by reference). Disambiguates a return of false, a storable value.
Default: null

Code of WP Object Cache::get: wp-includes/cache.php WP 5.2.2

<?php
public function get( $key, $group = 'default', $force = false, &$found = null ) {
	if ( empty( $group ) ) {
		$group = 'default';
	}

	if ( $this->multisite && ! isset( $this->global_groups[ $group ] ) ) {
		$key = $this->blog_prefix . $key;
	}

	if ( $this->_exists( $key, $group ) ) {
		$found             = true;
		$this->cache_hits += 1;
		if ( is_object( $this->cache[ $group ][ $key ] ) ) {
			return clone $this->cache[ $group ][ $key ];
		} else {
			return $this->cache[ $group ][ $key ];
		}
	}

	$found               = false;
	$this->cache_misses += 1;
	return false;
}