Code-Snippets-Functions/Execute a function on a child site/WooCommerce/move-discount-field-below-shipping-field-in-orders-details.txt

function reordering_order_item_totals( $total_rows, $wc_order, $tax_display ) {

    $total_rows = move_key_before( $total_rows, 'discount', 'shipping' );

    return $total_rows;
}
add_filter( 'woocommerce_get_order_item_totals', 'reordering_order_item_totals', 10, 3 );

function move_key_before( $arr, $find, $move ) {
    if ( ! isset( $arr[ $find ], $arr[ $move ] ) ) { // Check both keys exists.
        return $arr;
    }

    $elem  = array( $move => $arr[ $move ] );
    $start = array_splice( $arr, 0, array_search( $find, array_keys( $arr ), true ) );
    unset( $start[ $move ] ); 
    return $start + $elem + $arr;
}