Adding Custom URL Field to Product Categories in WordPress

If you want to enrich your WordPress product categories with custom URLs, follow these steps to seamlessly integrate a custom URL field on both the ‘Add New Term’ and ‘Edit Term’ pages:

Add Term Page:

function custom_url_taxonomy_add_new_meta_field() {
	?>
	<div class="form-field">
		<label for="term_meta[custom_term_meta]"><?php _e( 'Custom URL Category', 'custom_url_category' ); ?></label>
		<input type="text" name="term_meta[custom_term_meta]" id="term_meta[custom_term_meta]" value="">
		<p class="description"><?php _e( 'Insert a custom URL for the category','custom_url_category' ); ?></p>
	</div>
	<?php
}
add_action( 'product_cat_add_form_fields', 'custom_url_taxonomy_add_new_meta_field', 10, 2 );

Edit Term Page:

function custom_url_taxonomy_edit_meta_field($term) {
	$t_id = $term->term_id;
	$term_meta = get_option( "taxonomy_$t_id" );
	?>
	<tr class="form-field">
		<th scope="row" valign="top"><label for="term_meta[custom_term_meta]"><?php _e( 'Custom URL Category', 'custom_url_category' ); ?></label></th>
		<td>
			<input type="text" name="term_meta[custom_term_meta]" id="term_meta[custom_term_meta]" value="<?php echo esc_attr( $term_meta['custom_term_meta'] ) ? esc_attr( $term_meta['custom_term_meta'] ) : ''; ?>">
			<p class="description"><?php _e( 'Insert a custom URL for the category','custom_url_category' ); ?></p>
		</td>
	</tr>
	<?php
}
add_action( 'product_cat_edit_form_fields', 'custom_url_taxonomy_edit_meta_field', 10, 2 );

Save Extra Taxonomy Fields:

function save_taxonomy_custom_meta( $term_id ) {
	if ( isset( $_POST['term_meta'] ) ) {
		$t_id = $term_id;
		$term_meta = get_option( "taxonomy_$t_id" );
		$cat_keys = array_keys( $_POST['term_meta'] );
		foreach ( $cat_keys as $key ) {
			if ( isset ( $_POST['term_meta'][$key] ) ) {
				$term_meta[$key] = $_POST['term_meta'][$key];
			}
		}
		update_option( "taxonomy_$t_id", $term_meta );
	}
}  
add_action( 'edited_product_cat', 'save_taxonomy_custom_meta', 10, 2 );  
add_action( 'create_product_cat', 'save_taxonomy_custom_meta', 10, 2 );

This set of functions facilitates the addition, editing, and saving of custom URLs for WordPress product categories. Simply integrate this code into your theme’s functions.php file or create a custom plugin for an enhanced and organized approach. Now, you can effortlessly manage custom URLs for your product categories directly from the WordPress admin interface.