Custom-Sorting-Product-Categories-Woocommerce.php

<?php

// to be add in functions.php 
// THis will provide option to add Custom ORder for displaying category in sidebar in woo-commerce
// Screenshot : http://prntscr.com/axya62

add_action('product_cat_add_form_fields', 'category_metabox_add', 10, 1);
add_action('product_cat_edit_form_fields', 'category_metabox_edit', 10, 1);
add_action('created_product_cat', 'save_category_meta_data', 10, 1);	
add_action('edited_product_cat', 'save_category_meta_data', 10, 1);

function category_metabox_add($tag) 
{
?>
<div class="form-field">
    <label for="tax-order"><?php _e('Order') ?></label>
    <input name="tax-order" id="tax-order" type="text" value="" size="40" aria-required="true" />
    <p class="description"><?php _e('Determines the order in which the term is displayed.'); ?></p>
</div>
<?php
}

function category_metabox_edit($tag) {
    ?>
    <tr class="form-field">
        <th scope="row" valign="top">
            <label for="tax-order"><?php _e('Order'); ?></label>
        </th>
        <td>
            <input name="tax-order" id="tax-order" type="text" value="<?php echo get_term_meta($tag->term_id, 'tax-order', true); ?>" size="40" aria-required="true" />
            <p class="description"><?php _e('Determines the order in which the term is displayed.'); ?></p>
        </td>
    </tr>
    <?php
}

function save_category_meta_data($term_id) {
    if (isset($_POST['tax-order']))
        update_term_meta($term_id, 'tax-order', $_POST['tax-order']);
}

add_filter('get_terms', 'custom_term_sort', 10, 3);

function custom_term_sort($terms, $taxonomies, $args) {
    // Controls behavior when get_terms is called at unusual times resulting in a terms array without objects
    $empty = false;

    // Create collector arrays
    $ordered_terms = array();
    $unordered_terms = array();

    // Add taxonomy order to terms
    foreach ($terms as $term) {
        // Only set tax_order if value is an object
        if (is_object($term)) {
            if ($taxonomy_sort = get_term_meta($term->term_id, 'tax-order', true)) {
                $term->tax_order = (int) $taxonomy_sort;
                $ordered_terms[] = $term;
            } else {
                $term->tax_order = (int) 0;
                $unordered_terms[] = $term;
            }
        } else
            $empty = true;
    }

    // Only sort by tax_order if there are items to sort, otherwise return the original array
    if (!$empty && count($ordered_terms) > 0)
        quickSort($ordered_terms);
    else
        return $terms;

    // Combine the newly ordered items with the unordered items and return
    return array_merge($ordered_terms, $unordered_terms);
}

function quickSort(&$array) {
    $cur = 1;
    $stack[1]['l'] = 0;
    $stack[1]['r'] = count($array) - 1;

    do {
        $l = $stack[$cur]['l'];
        $r = $stack[$cur]['r'];
        $cur--;

        do {
            $i = $l;
            $j = $r;
            $tmp = $array[(int) ( ($l + $r) / 2 )];

            // partion the array in two parts.
            // left from $tmp are with smaller values,
            // right from $tmp are with bigger ones
            do {
                while ($array[$i]->tax_order < $tmp->tax_order)
                    $i++;

                while ($tmp->tax_order < $array[$j]->tax_order)
                    $j--;

                // swap elements from the two sides
                if ($i <= $j) {
                    $w = $array[$i];
                    $array[$i] = $array[$j];
                    $array[$j] = $w;

                    $i++;
                    $j--;
                }
            } while ($i <= $j);

            if ($i < $r) {
                $cur++;
                $stack[$cur]['l'] = $i;
                $stack[$cur]['r'] = $r;
            }
            $r = $j;
        } while ($l < $r);
    } while ($cur != 0);
}

add_filter('woocommerce_get_catalog_ordering_args', 'am_woocommerce_catalog_orderby');

function am_woocommerce_catalog_orderby($args) {
    $args['meta_key'] = '';
    $args['orderby'] = 'tax-order';
    $args['order'] = 'asc';
    return $args;
}

?>