[Sort product attributes in variations dropdown on single page by backend variations order ] #wp #woocommerce #products #product_attributes #sorting #terms #variations

sorting_in_variations_dropdown.php

<?php

// Add a filter to modify the HTML of the dropdown for variation attribute options
add_filter('woocommerce_dropdown_variation_attribute_options_html', 'wc_dropdown_variation_attribute_options_sorted', 20, 2);

// Function to sort the variation attribute options
function wc_dropdown_variation_attribute_options_sorted( $html, $args ) {
    // Parse the arguments with the default values
    $args = wp_parse_args(
        apply_filters( 'woocommerce_dropdown_variation_attribute_options_args', $args ),
        array(
            'options'          => false,
            'attribute'        => false,
            'product'          => false,
            'selected'         => false,
            'name'             => '',
            'id'               => '',
            'class'            => '',
            'show_option_none' => __( 'Choose an option', 'woocommerce' ),
        )
    );

    // If no selected option is set, use the default attribute of the product
    if ( false === $args['selected'] && $args['attribute'] && $args['product'] instanceof WC_Product ) {
        $selected_key = 'attribute_' . sanitize_title( $args['attribute'] );
        $args['selected'] = isset( $_REQUEST[ $selected_key ] ) ? wc_clean( wp_unslash( $_REQUEST[ $selected_key ] ) ) : $args['product']->get_variation_default_attribute( $args['attribute'] );
    }

    // Extract the arguments into variables
    $options = $args['options'];
    $product = $args['product'];
    $attribute = $args['attribute'];
    $name = $args['name'] ? $args['name'] : 'attribute_' . sanitize_title( $attribute );
    $id = $args['id'] ? $args['id'] : sanitize_title( $attribute );
    $class = $args['class'];
    $show_option_none = (bool) $args['show_option_none'];
    $show_option_none_text = $args['show_option_none'] ? $args['show_option_none'] : __( 'Choose an option', 'woocommerce' );

    // If no options are set, get the variation attributes of the product
    if ( empty( $options ) && ! empty( $product ) && ! empty( $attribute ) ) {
        $attributes = $product->get_variation_attributes();
        $options = $attributes[ $attribute ];
    }

    // Start building the HTML for the dropdown
    $html = '<select id="' . esc_attr( $id ) . '" class="' . esc_attr( $class ) . '" name="' . esc_attr( $name ) . '" data-attribute_name="attribute_' . esc_attr( sanitize_title( $attribute ) ) . '" data-show_option_none="' . ( $show_option_none ? 'yes' : 'no' ) . '">';
    $html .= '<option value="">' . esc_html( $show_option_none_text ) . '</option>';

    // If no options are available, return the HTML
    if ( empty( $options ) ) {
        return $html .= '</select>';
    }

    // If the attribute is a taxonomy, get the terms and sort them
    if ( $product && taxonomy_exists( $attribute ) ) {
        $terms = wc_get_product_terms(
            $product->get_id(),
            $attribute,
            array(
                'fields' => 'all',
            )
        );

        
        //sorting starts here
        foreach($terms as $key => $term) {
            $i = 0;
            foreach($product->get_available_variations() as $variation) {
                $i++;
                if ($term->slug == $variation['attributes'][$name]) {
                    $key = $i - 1;
                    unset($terms[$key]);
                    $terms[$key] = $term;
                }
            }
        }

        ksort($terms);

        // Separate terms into months, years, and other options
        /*$months = [];
        $years = [];
        $other_options = [];
        foreach ($terms as $term) {
            if (strpos($term->name, 'mes') !== false) { // Mesi o mese: in questo caso l'ultima lettera la eludo per prendere sia singolare che plurale
                $months[] = $term;
            } elseif (strpos($term->name, 'ann') !== false) { // Anni o anno: in questo caso l'ultima lettera la eludo per prendere sia singolare che plurale
                $years[] = $term;
            } else {
                $other_options[] = $term;
            }
        }

        // Merge months, years, and other options
        $sorted_terms = array_merge($months, $years, $other_options);

        // Replace the original terms array with the sorted one
        $terms = $sorted_terms;

        // Sort the terms by key
        ksort($terms);*/

        // Add each term as an option in the dropdown
        foreach ( $terms as $term ) {
            if ( in_array( $term->slug, $options, true ) ) {
                $html .= '<option value="' . esc_attr( $term->slug ) . '" ' . selected( sanitize_title( $args['selected'] ), $term->slug, false ) . '>' . esc_html( apply_filters( 'woocommerce_variation_option_name', $term->name, $term, $attribute, $product ) ) . '</option>';
            }
        }
    } else {
        // If the attribute is not a taxonomy, add each option in the dropdown
        foreach ( $options as $option ) {
            $selected = sanitize_title( $args['selected'] ) === $args['selected'] ? selected( $args['selected'], sanitize_title( $option ), false ) : selected( $args['selected'], $option, false );
            $html .= '<option value="' . esc_attr( $option ) . '" ' . $selected . '>' . esc_html( apply_filters( 'woocommerce_variation_option_name', $option, null, $attribute, $product ) ) . '</option>';
        }
    }

    // Return the final HTML for the dropdown
    return $html .= '</select>';
}