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PHP

Private Internal Note Field for Products

Adds an "Internal note" box to the product edit screen for staff-only information such as supplier details. It is never shown to customers.

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Code

add_action( 'woocommerce_product_options_general_product_data', function () {
    echo '<div class="options_group">';
    woocommerce_wp_textarea_input( array(
        'id'          => '_wpide_internal_note',
        'label'       => 'Internal note',
        'description' => 'Only visible to staff.',
        'desc_tip'    => true,
    ) );
    echo '</div>';
} );

add_action( 'woocommerce_admin_process_product_object', function ( $product ) {
    if ( isset( $_POST['_wpide_internal_note'] ) ) { // phpcs:ignore WordPress.Security.NonceVerification -- WooCommerce verifies the product nonce.
        $product->update_meta_data( '_wpide_internal_note', sanitize_textarea_field( wp_unslash( $_POST['_wpide_internal_note'] ) ) );
    }
} );

Notes

Saved in the product meta key _wpide_internal_note.

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