Add Shipping Classes column to Products admin page - Add a new column to the WooCommerce Products admin page. https://www.damiencarbery.com/2022/10/add-shipping-classes-column-to-products-admin-page/

wc-add-shipping-classes-column.php

<?php
/*
Plugin Name: WooCommerce Shipping Classes column to Products listing
Plugin URI: https://www.damiencarbery.com/2022/10/add-shipping-classes-column-to-products-admin-page/
Description: Add a Shipping Class column to the WooCommerce Products listing pages. Requested in WooCommerce Community Facebook group: https://www.facebook.com/groups/advanced.woocommerce/posts/6186336834714017/. Inspired by https://www.conicsolutions.net/tutorials/woocommerce-how-to-add-custom-columns-on-the-products-list-in-dashboard/
Author: Damien Carbery
Version: 0.2
*/


class AddShippingClassColumn {
	// Column key and title.
	private $column_key;
	private $column_title;


	// Returns an instance of this class. 
	public static function get_instance() {
		if ( null == self::$instance ) {
			self::$instance = new self;
		} 
		return self::$instance;
	}


	// Initialize the plugin variables.
	public function __construct() {
		$this->column_key = 'shipping_class';
		$this->column_title = 'Shipping <br/>class';

		$this->init();
	}


	// Set up WordPress specfic actions.
	public function init() {
		// Add the new column.
		add_filter( 'manage_product_posts_columns', array( $this, 'set_custom_column' ), 20 );
		// Populate the new column with the shipping class name.
		add_action( 'manage_product_posts_custom_column' , array( $this, 'populate_custom_column' ), 10, 2 );
		// Add CSS to ensure new column width is not distored.
		add_action( 'admin_head', array( $this, 'add_column_css' ) );
	}


	// Add the new column.
	public function set_custom_column( $columns ) {
		// Comment this variable out to add column to the end.
		$insert_after = 'product_cat';
		
		// If $insert_after is set, and found, add the new column after it.
		if ( isset( $insert_after ) ) {
			$position = array_search( $insert_after, array_keys( $columns ) );
			if ( false !== $position ) {
				$before = $columns;
				$after = $columns;
				array_splice( $before, $position + 1 );
				array_splice( $after, 0, $position + 1 );
				$before[ $this->column_key ] = $this->column_title; // To avoid wrapping. Add space for 'Screen Options' panel.
				$columns = array_merge( $before, $after );
			}
		}
		else {
			// Otherwise add the new column at the end.
			$columns[ $this->column_key ] = $this->column_title;
			
		}
		
		return $columns;
	}


	// Populate the new column with the shipping class name.
	public function populate_custom_column( $column, $post_id ) {
		// Use switch() to  allow for additional columns in the future.
		switch ( $column ) {
			case 'shipping_class':
				$product = wc_get_product( $post_id );
				
				// Copy code from WC_Product::get_shipping_class() but echo term name instead of slug.
				$class_id = $product->get_shipping_class_id();
				if ( $class_id ) {
					$term = get_term_by( 'id', $class_id, 'product_shipping_class' );
					
					if ( $term && ! is_wp_error( $term ) ) {
						echo $term->name;
						break;
					}
				}
				echo '<span class="na">&ndash;</span>';  // No shipping class.
				break;
		}
	}


	// Add CSS to ensure new column width is not distored.
	public function add_column_css() {
		$currentScreen = get_current_screen();
		if ( isset( $currentScreen ) ) {
			// base = edit
			// id = edit-product
			//error_log( 'get_current_screen: ' . var_export( $currentScreen, true ) );
			if ( 'edit-product' == $currentScreen->id ) {
?>
<style>table.wp-list-table .column-shipping_class { width: 11% !important; }</style>
<?php
			}
		}
	}
}
$AddShippingClassColumn = new AddShippingClassColumn();