Sort categories by ID.

Used by usort() as a callback, should not be used directly. Can actually be
used to sort any term object.

function _usort_terms_by_ID( $a, $b ) {
	_deprecated_function( __FUNCTION__, '4.7.0', 'wp_list_sort()' );

	if ( $a->term_id > $b->term_id )
		return 1;
	elseif ( $a->term_id term_id )
		return -1;
	else
		return 0;
}