Make product attributes linkable

functions.php

<?php
/**
 * Register term fields for WooCommerce attributes.
 */
add_action( 'init', 'register_attributes_url_meta' );
function register_attributes_url_meta() {
    $attributes = wc_get_attribute_taxonomies();

    foreach ( $attributes as $tax ) {
        $name = wc_attribute_taxonomy_name( $tax->attribute_name );

        add_action( "{$name}_add_form_fields", 'add_attribute_url_meta_field' );
        add_action( "{$name}_edit_form_fields", 'edit_attribute_url_meta_field', 10 );
        add_action( "edited_{$name}", 'save_attribute_url' );
        add_action( "create_{$name}", 'save_attribute_url' );
    }
}

/**
 * Add URL field to the new attribute term form.
 */
function add_attribute_url_meta_field() {
    wp_nonce_field( basename( __FILE__ ), 'attribute_url_meta_nonce' );
    ?>
    <div class="form-field">
        <label for="attribute_url"><?php esc_html_e( 'URL', 'woocommerce' ); ?></label>
        <input type="url" name="attribute_url" id="attribute_url" value="" />
    </div>
    <?php
}

/**
 * Add URL field to the edit attribute term form.
 */
function edit_attribute_url_meta_field( $term ) {
    $url = get_term_meta( $term->term_id, 'attribute_url', true );
    wp_nonce_field( basename( __FILE__ ), 'attribute_url_meta_nonce' );
    ?>
    <tr class="form-field">
        <th scope="row" valign="top"><label for="attribute_url"><?php esc_html_e( 'URL', 'woocommerce' ); ?></label></th>
        <td>
            <input type="url" name="attribute_url" id="attribute_url" value="<?php echo esc_url( $url ); ?>" />
        </td>
    </tr>
    <?php
}

/**
 * Save URL field for attribute terms.
 */
function save_attribute_url( $term_id ) {
    if ( ! isset( $_POST['attribute_url'], $_POST['attribute_url_meta_nonce'] ) || 
         ! wp_verify_nonce( $_POST['attribute_url_meta_nonce'], basename( __FILE__ ) ) ) {
        return;
    }

    $new_url = esc_url_raw( $_POST['attribute_url'] );
    update_term_meta( $term_id, 'attribute_url', $new_url );
}

/**
 * Filter to make product attributes linkable.
 */
add_filter( 'woocommerce_attribute', 'make_product_atts_linkable', 10, 3 );
function make_product_atts_linkable( $text, $attribute, $values ) {
    $new_values = array();

    foreach ( $values as $value ) {
        if ( $attribute['is_taxonomy'] ) {
            // Handle global attributes
            $term = get_term_by( 'name', $value, $attribute['name'] );
            if ( ! is_wp_error( $term ) && ! empty( $term ) ) {
                $url = get_term_meta( $term->term_id, 'attribute_url', true );

                if ( ! empty( $url ) ) {
                    $new_values[] = '<a href="' . esc_url( $url ) . '" title="' . esc_attr( $value ) . '">' . esc_html( $value ) . '</a>';
                } else {
                    $new_values[] = esc_html( $value );
                }
            }
        } else {
            // Handle local attributes (Markdown syntax)
            if ( preg_match( "/\[(.*?)\]\((.*?)\)/", $value, $matches ) ) {
				$link_text = esc_html( $matches[1] );
				$link_url = strip_tags( $matches[2] ); // Directly use the URL from the match
				
				// Continue with your existing logic
				if ( filter_var( $link_url, FILTER_VALIDATE_URL ) ) {
					$new_values[] = '<a href="' . esc_url( $link_url ) . '">' . $link_text . '</a>';
				} else {
					// If the URL isn't valid, just use the text
					$new_values[] = $link_text;
				}
			}
        }
    }

    return implode( ', ', $new_values );
}

Hi
I use from this code and work correctly. but show a Notice in top of the every product in single page. That Notice is:
"Notice: Trying to get property 'term_id' of non-object in /home/micromod/domains/micmodshop.ir/public_html/wp-content/themes/avada-child/functions.php on line 155"
How can i fixed it?

Hello, thanks for your code, it works super. Just a question, is there a way to export URL field in Woocommerce CSV? Thanks a lot!

This works, thanks. But some of my attributes disappear when I use it:
Before:

After:

Any tips? And thanks for your snippet.