WordPress at a glance
function is not described

_wc_get_product_terms_parent_usort_callback() WC 1.0

Sort by parent.

This is an internal function for using it by WP core itself. It's not recommended to use this function in your code.

No Hooks.

Return

Int. Nothing.

Usage

_wc_get_product_terms_parent_usort_callback( $a, $b );
$a(WP_Post) (required)
First item to compare.
$b(WP_Post) (required)
Second item to compare.

Code of _wc_get_product_terms_parent_usort_callback() WC 5.3.0

<?php
function _wc_get_product_terms_parent_usort_callback( $a, $b ) {
	if ( $a->parent === $b->parent ) {
		return 0;
	}
	return ( $a->parent < $b->parent ) ? 1 : -1;
}