Sorting Shopp cart by blog_id (product meta data)

shopp-cart-sort.php

<?php
foreach ( ShoppOrder()->Cart->contents as &$item ) {
	$item->blog_id = get_post_meta( $item->product, 'blog_id', true );
}

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

usort( ShoppOrder()->Cart->contents, 'finecabin_sort_cart' );