apply_filters( 'populate_network_meta', array $sitemeta, int $network_id )

1288	 *1289	 * @since 3.7.01290	 *1291	 * @param array $sitemeta   Associative array of network meta keys and values to be inserted.1292	 * @param int   $network_id ID of network to populate.1293	 */1294	$sitemeta = apply_filters( 'populate_network_meta', $sitemeta, $network_id );1295 1296	$insert = '';1297	foreach ( $sitemeta as $meta_key => $meta_value ) {1298		if ( is_array( $meta_value ) ) {1299			$meta_value = serialize( $meta_value );1300		}