<?php
/**
  * Sample function to create a WooCommerce product programmatically using PHP.
  * This code will insert the product into the WordPress post's table and then update the WooCommerce pricing/settings.
  * @see https://woocommerce.github.io/code-reference/classes/WC-Product.html for available methods.
  *
  * Please note this is a _starting point_ and would need to be 'hooked' into a relevant action such as form submission, etc.
  * We recommend reaching out to a developer for assistance with this code if it's unclear. Replace values where you see fit.
  */
 function my_create_woo_product( $data = null ) {
    $post_args = array(
        'post_author' => intval( $data['author_id'] ), // The user's ID
        'post_title' => sanitize_text_field( $data['title'] ), // The product's Title
        'post_type' => 'product',
        'post_status' => 'publish' // This could also be $data['status'];
    );

    $post_id = wp_insert_post( $post_args );
   
    // If the post was created okay, let's try update the WooCommerce values.
    if ( ! empty( $post_id ) && function_exists( 'wc_get_product' ) ) {
        $product = wc_get_product( $post_id );
        $product->set_sku( 'pre-' . $post_id ); // Generate a SKU with a prefix. (i.e. 'pre-123') 
        $product->set_regular_price( '20.55' ); // Be sure to use the correct decimal price.
        $product->set_category_ids( array( 16, 17 ) ); // Set multiple category ID's.
        $product->save(); // Save/update the WooCommerce order object.
    }
}