WP_Term_Query::generate_cache_key( array $args, string $sql )

	protected function generate_cache_key( array $args, $sql ) {
		global $wpdb;
		// $args can be anything. Only use the args defined in defaults to compute the key.
		$cache_args = wp_array_slice_assoc( $args, array_keys( $this->query_var_defaults ) );

		unset( $cache_args['update_term_meta_cache'] );

		if ( 'count' !== $args['fields'] && 'all_with_object_id' !== $args['fields'] ) {
			$cache_args['fields'] = 'all';
		}
		$taxonomies = (array) $args['taxonomy'];

		// Replace wpdb placeholder in the SQL statement used by the cache key.
		$sql = $wpdb->remove_placeholder_escape( $sql );

		$key          = md5( serialize( $cache_args ) . serialize( $taxonomies ) . $sql );
		$last_changed = wp_cache_get_last_changed( 'terms' );
		return "get_terms:$key:$last_changed";
	}