wc term_exists category
// Get an instance of the WC_Product object
$product = wc_get_product( $product_id );
$term_names = $product->get_attribute( 'Platform' ); // Can have many term names (coma separated)
$term_names = explode( ',', $term_names);
$term_ids = [];
// Loop through the terms
foreach( $term_names as $term_name ) {
// Get the term ID and check if it exist
if( $term_id = term_exists( $term_name, 'product_cat' ) ) {
// Add each term ID in an array
$term_ids[] = $term_id;
}
}
// Append the product category terms in the product
if( sizeof($term_ids) > 0 ) {
$product->set_category_ids( $term_ids );
$product->save();
}