Woocommerce add_filter vs. add_action when asking about specific product meta

In WooCommerce, add_filter and add_action are both WordPress functions that are used to modify the behavior of the plugin, but they are used for different purposes.

add_filter is used to modify data before it is displayed or used. For example, you can use a filter to modify the price of a product before it is displayed on the product page.

Copy codeadd_filter( 'woocommerce_get_price', 'change_product_price', 10, 2 );
function change_product_price( $price, $product ) {
    $new_price = $price * 1.5;
    return $new_price;
}

This code uses the woocommerce_get_price filter to modify the price of a product before it is displayed on the product page, it multiplies the price by 1.5 and returns the new price.

add_action is used to execute a function at a specific point in the execution of the plugin or theme. For example, you can use an action to add a custom field to the product page after the price is displayed.

Copy codeadd_action( 'woocommerce_single_product_summary', 'add_custom_field_to_product', 15 );
function add_custom_field_to_product() {
    global $product;
    $custom_field = get_post_meta( $product->get_id(), 'custom_field', true );
    echo '<div class="custom-field">' . $custom_field . '</div>';
}

This code uses the woocommerce_single_product_summary action to add a custom field to the product page, it gets the custom field value from the product’s meta data and displays it after the price is displayed on the product page.

When it comes to specific product meta, it depends on what you want to achieve, you can use the add_filter to modify the product meta before it is displayed or used, or you can use the add_action to execute a function to display the product meta in a specific location on the product page.