The main error comes from undefined$product
variable. Try the following instead:
add_action( 'woocommerce_product_options_sku', 'add_product_final_sku_custom_field' );
function add_product_final_sku_custom_field(){
global $post, $product_object;
if ( ! is_a( $product_object, 'WC_Product' ) ) {
$product_object = wc_get_product( $post->ID );
}
if ( $product_object->is_type('pw-gift-card') ) {
woocommerce_wp_text_input( array(
'label' => __( 'Final SKU', 'woocommerce' ),
'placeholder' => __( 'Enter final SKU here', 'woocommerce' ),
'id' => 'final_sku',
'desc_tip' => true,
'description' => __( 'This SKU is for final use only.', 'woocommerce' ),
) );
}
}
Code goes in functions.php file of the active child theme (or active theme).
Important Note: Specifying a product type as condition will not work when adding a new product, as the product type is not yet saved. This need to be done some CSS...
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PHP (from the English Hypertext Preprocessor - hypertext preprocessor) is a scripting programming language for developing web applications. Supported by most hosting providers, it is one of the most popular tools for creating dynamic websites.
The PHP scripting language has gained wide popularity due to its processing speed, simplicity, cross-platform, functionality and distribution of source codes under its own license.
https://www.php.net/
CSS (Cascading Style Sheets) is a formal language for describing the appearance of a document written using a markup language.
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https://www.w3.org/TR/CSS/#css
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