WP_Network_Query::get_networks(): array|int

189	public function get_networks() {190		$this->parse_query();191 192		/**193		 * Fires before networks are retrieved.194		 *195		 * @since 4.6.0196		 *197		 * @param WP_Network_Query $query Current instance of WP_Network_Query (passed by reference).198		 */199		do_action_ref_array( 'pre_get_networks', array( &$this ) );200 201		$network_data = null;202 203		/**204		 * Filters the network data before the query takes place.205		 *206		 * Return a non-null value to bypass WordPress' default network queries.207		 *208		 * The expected return type from this filter depends on the value passed209		 * in the request query vars:210		 * - When `$this->query_vars['count']` is set, the filter should return211		 *   the network count as an integer.212		 * - When `'ids' === $this->query_vars['fields']`, the filter should return213		 *   an array of network IDs.214		 * - Otherwise the filter should return an array of WP_Network objects.215		 *216		 * Note that if the filter returns an array of network data, it will be assigned217		 * to the `networks` property of the current WP_Network_Query instance.218		 *219		 * Filtering functions that require pagination information are encouraged to set220		 * the `found_networks` and `max_num_pages` properties of the WP_Network_Query object,221		 * passed to the filter by reference. If WP_Network_Query does not perform a database222		 * query, it will not have enough information to generate these values itself.223		 *224		 * @since 5.2.0225		 * @since 5.6.0 The returned array of network data is assigned to the `networks` property226		 *              of the current WP_Network_Query instance.227		 *228		 * @param array|int|null   $network_data Return an array of network data to short-circuit WP's network query,229		 *                                       the network count as an integer if `$this->query_vars['count']` is set,230		 *                                       or null to allow WP to run its normal queries.231		 * @param WP_Network_Query $query        The WP_Network_Query instance, passed by reference.232		 */233		$network_data = apply_filters_ref_array( 'networks_pre_query', array( $network_data, &$this ) );234 235		if ( null !== $network_data ) {236			if ( is_array( $network_data ) && ! $this->query_vars['count'] ) {237				$this->networks = $network_data;238			}239 240			return $network_data;241		}242 243		// $args can include anything. Only use the args defined in the query_var_defaults to compute the key.244		$_args = wp_array_slice_assoc( $this->query_vars, array_keys( $this->query_var_defaults ) );245 246		// Ignore the $fields, $update_network_cache arguments as the queried result will be the same regardless.247		unset( $_args['fields'], $_args['update_network_cache'] );248 249		$key          = md5( serialize( $_args ) );250		$last_changed = wp_cache_get_last_changed( 'networks' );251 252		$cache_key   = "get_network_ids:$key:$last_changed";253		$cache_value = wp_cache_get( $cache_key, 'network-queries' );254 255		if ( false === $cache_value ) {256			$network_ids = $this->get_network_ids();257			if ( $network_ids ) {258				$this->set_found_networks();259			}260 261			$cache_value = array(262				'network_ids'    => $network_ids,263				'found_networks' => $this->found_networks,264			);265			wp_cache_add( $cache_key, $cache_value, 'network-queries' );266		} else {267			$network_ids          = $cache_value['network_ids'];268			$this->found_networks = $cache_value['found_networks'];