woocommerce add custom attribute

add-custom-attribute.php

<?php 


    add_action('init',  'generate_taxonomy_product');

    function generate_taxonomy_product($value=''){
	    $my_product_attributes = array('hdd1' => 'qqqqqq', 'ram2' => 'wwwwwww');
	    wcproduct_set_attributes(10807, $my_product_attributes);
    }
 
    function wcproduct_set_attributes($post_id, $attributes) {
        global $superopt;
        $product = wc_get_product($post_id);
        $old_attributes = $product->get_attributes();
        $product_attributes  = [];
        foreach ( $old_attributes as $name => $value ) {
            $product_attributes[] = array (
                'name' => htmlspecialchars( stripslashes( $name ) ), // set attribute name
                'value' => $value, // set attribute value
                'position' => 1,
                'is_visible' => 1,
                'is_variation' => 1,
                'is_taxonomy' => 0
            );
        }
        foreach ($attributes as $name => $value) {
            $product_attributes[] = array (
                'name' => htmlspecialchars( stripslashes( $name ) ), // set attribute name
                'value' => $value, // set attribute value
                'position' => 1,
                'is_visible' => 1,
                'is_variation' => 1,
                'is_taxonomy' => 0
            );
        }
        update_post_meta($post_id, '_product_attributes', $product_attributes);
    }