Create new product attribute programmatically in Woocommerce

To create a term you can use wp_insert_term()

like so:

wp_insert_term( 'red', 'pa_colors' );

where colors is the name of your attribute. The taxonomy name of an attribute is always prepended by pa_.

Edit Attributes are merely custom taxonomies. Or you could say they are dynamic taxonomies that are manually created by the user in the back-end. Still, all the same, custom taxonomy rules apply.

You can see the source code here which loops through the attributes and runs register_taxonomy() on each. So to create a new attribute (remember it is just a taxonomy) then you need to run register_taxonomy() and simple prepend pa_ to the start of the taxonomy name.

Mimicking some of the values of the taxonomy args from core would get you something like this for a 'Colors' attribute.

/** * Register a taxonomy. */function so_29549525_register_attribute() {    $permalinks = get_option( 'woocommerce_permalinks' );    $taxonomy_data = array(                        'hierarchical'          => true,                        'update_count_callback' => '_update_post_term_count',                        'labels'                => array(                                'name'              => __( 'My Colors', 'your-textdomain' ),                                'singular_name'     => __( 'Color', 'your-textdomain' ),                                'search_items'      => __( 'Search colors', 'your-textdomain' ),                                'all_items'         => __( 'All colors', 'your-textdomain' ),                                'parent_item'       => __( 'Parent color', 'your-textdomain' ),                                'parent_item_colon' => __( 'Parent color:', 'your-textdomain' ),                                'edit_item'         => __( 'Edit color', 'your-textdomain' ),                                'update_item'       => __( 'Update color', 'your-textdomain' ),                                'add_new_item'      => __( 'Add new color', 'your-textdomain' ),                                'new_item_name'     => __( 'New color', 'your-textdomain' )                            ),                        'show_ui'           => false,                        'query_var'         => true,                        'rewrite'           => array(                            'slug'         => empty( $permalinks['attribute_base'] ) ? '' : trailingslashit( $permalinks['attribute_base'] ) . sanitize_title( 'colors' ),                            'with_front'   => false,                            'hierarchical' => true                        ),                        'sort'              => false,                        'public'            => true,                        'show_in_nav_menus' => false,                        'capabilities'      => array(                            'manage_terms' => 'manage_product_terms',                            'edit_terms'   => 'edit_product_terms',                            'delete_terms' => 'delete_product_terms',                            'assign_terms' => 'assign_product_terms',                        )                    );  register_taxonomy( 'pa_my_color', array('product'), $taxonomy_data );}add_action( 'woocommerce_after_register_taxonomy', 'so_29549525_register_attribute' );

Update 2020-11-18

Attribute taxonomies are stored in the {$wpdb->prefix}woocommerce_attribute_taxonomies database table. And from there WooCommerce runs register_taxonomy() on each one that's found in the table. So in order to create an attribute taxonomy, a row should be added to this table. WooCommerce has a function wc_create_attribute() that will handle this for us. (Since 3.2+).

My conditional logic to test if the attribute exists is not the greatest and I would advise using some kind of version option in your plugin's update routine. But as an example of using wc_create_taxonomy() this should insert an attribute called "My Color".

/** * Register an attribute taxonomy. */function so_29549525_create_attribute_taxonomies() {    $attributes = wc_get_attribute_taxonomies();    $slugs = wp_list_pluck( $attributes, 'attribute_name' );    if ( ! in_array( 'my_color', $slugs ) ) {        $args = array(            'slug'    => 'my_color',            'name'   => __( 'My Color', 'your-textdomain' ),            'type'    => 'select',            'orderby' => 'menu_order',            'has_archives'  => false,        );        $result = wc_create_attribute( $args );    }}add_action( 'admin_init', 'so_29549525_create_attribute_taxonomies' );

For Woocommerce 3+ (2018)

To create a new product attribute from a label name use the following function:

function create_product_attribute( $label_name ){    global $wpdb;    $slug = sanitize_title( $label_name );    if ( strlen( $slug ) >= 28 ) {        return new WP_Error( 'invalid_product_attribute_slug_too_long', sprintf( __( 'Name "%s" is too long (28 characters max). Shorten it, please.', 'woocommerce' ), $slug ), array( 'status' => 400 ) );    } elseif ( wc_check_if_attribute_name_is_reserved( $slug ) ) {        return new WP_Error( 'invalid_product_attribute_slug_reserved_name', sprintf( __( 'Name "%s" is not allowed because it is a reserved term. Change it, please.', 'woocommerce' ), $slug ), array( 'status' => 400 ) );    } elseif ( taxonomy_exists( wc_attribute_taxonomy_name( $label_name ) ) ) {        return new WP_Error( 'invalid_product_attribute_slug_already_exists', sprintf( __( 'Name "%s" is already in use. Change it, please.', 'woocommerce' ), $label_name ), array( 'status' => 400 ) );    }    $data = array(        'attribute_label'   => $label_name,        'attribute_name'    => $slug,        'attribute_type'    => 'select',        'attribute_orderby' => 'menu_order',        'attribute_public'  => 0, // Enable archives ==> true (or 1)    );    $results = $wpdb->insert( "{$wpdb->prefix}woocommerce_attribute_taxonomies", $data );    if ( is_wp_error( $results ) ) {        return new WP_Error( 'cannot_create_attribute', $results->get_error_message(), array( 'status' => 400 ) );    }    $id = $wpdb->insert_id;    do_action('woocommerce_attribute_added', $id, $data);    wp_schedule_single_event( time(), 'woocommerce_flush_rewrite_rules' );    delete_transient('wc_attribute_taxonomies');}

Code goes in function.php file of your active child theme (or active theme). Tested and works.

Based on:

• Product Attribute wc_create_attribute() function code (Woocommerce 3.2+).
• Create programmatically a variable product and two new attributes in Woocommerce

Related: Create programmatically a product using CRUD methods in Woocommerce 3