How to use WC_Order class properly? - php

Question

I'm writing a Woocommerce plugin and I'm trying to get order information from the class WC_Order, and I get two different types of error.
In the first case, I'm using the following code:
public function woocommerce_loaded() {
global $woocommerce, $post;
$order = new WC_Order($post->ID);
}
And I get this:
PHP Fatal error: Uncaught Error: Class 'WC_Order' not found in C:\wamp64\www\mysite\wp-content\plugins\tutorial-plugin\tutorial-plugin.php
In the second case, I'm using this code:
public function woocommerce_loaded() {
global $woocommerce, $post;
$order = $woocommerce -> WC_Order($post->ID);
}
And I get the following error message:
PHP Fatal error: Uncaught Error: Call to a member function WC_Order() on null in C:\wamp64\www\mysite\wp-content\plugins\tutorial-plugin\tutorial-plugin.php
And for both cases, I'm hooking my function at my __construct() method with the following code:
add_action( 'woocommerce_init', array( $this, 'woocommerce_loaded' ) );
I also tried using this class with my orders id that I have access in the Woocommerce Orders page, but it didn't work either.
I'm new in this area, I don't know what I am doing wrong. I could use some help!
Here's the complete version of my plugin code:
<?php
//Make sure we don't expose any information if called directly
if ( ! defined( 'ABSPATH' ) ) exit;
//Check if Woocommerce is active
if ( in_array( 'woocommerce/woocommerce.php', apply_filters( 'active_plugins', get_option( 'active_plugins' ) ) ) ) {
//Check if a class with the same name doesn’t already exist
if ( ! class_exists( 'WC_tutorial_plugin' ) ) {
//Provide translation files
load_plugin_textdomain( 'tutorial-plugin', false, dirname( plugin_basename( __FILE__ ) ) . '/' );
//Plugin code
class WC_tutorial_plugin {
/**
* Constructor for the WC_tutorial_plugin class
*
* #access public
* #return void
*/
public function __construct() {
$this->id = 'tutorial-plugin'; // Id of the class
$this->method_title = __( 'Tutorial plugin' ); // Title shown in admin
$this->init();
global $woocommerce;
$this->woocommerce_loaded();
// called just before the woocommerce template functions are included
add_action( 'init', array( $this, 'include_template_functions' ), 20 );
// called only after woocommerce has finished loading
add_action( 'woocommerce_init', array( $this, 'woocommerce_loaded' ) );
// called after all plugins have loaded
add_action( 'plugins_loaded', array( $this, 'plugins_loaded' ) );
add_action( 'plugins_loaded', array( $this, 'init' ) );
}
/**
* Initialize settings
*
* #access public
* #return void
*/
public function init() {
// Load the settings API
$this->init_form_fields(); // This is part of the settings API.
}
function activate(){
//Flush rewrite rules
flush_rewrite_rules();
}
function deactivate(){
//Flush rewrite rules
flush_rewrite_rules();
}
/**
* Take care of anything that needs woocommerce to be loaded.
* For instance, if you need access to the $woocommerce global
*/
public function woocommerce_loaded() {
global $woocommerce;
$order = $woocommerce -> WC_Order(17);
}
/**
* Take care of anything that needs all plugins to be loaded
*/
public function plugins_loaded() {
do_action('woocommerce_init', array($this, 'woocommerce_loaded'));
}
}
//Finally instantiate our plugin class and add it to the set of globals
if ( class_exists('WC_tutorial_plugin')){
$GLOBALS['tutorial-plugin'] = new WC_tutorial_plugin();
$plugin = new WC_tutorial_plugin(__FILE__ );
$plugin -> woocommerce_loaded();
}
}
}
//Activation
register_activation_hook( __FILE__, array($plugin, 'activate'));
//Deactivation
register_deactivation_hook( __FILE__, array($plugin, 'deactivate'));

Answer 1

I tried a lot to find the solution for this, and in the end I found two things that can be useful:
we can use the init hook and put the priority to 100, and then use our function in it, if you can use your code this way then it is for you:
add_action('init', 'my_init', 1);
function my_init(){
$order = new WC_Order(5273);
}
The 2nd way is to fetch the order details directly from the database using the $wpdb. the order is stored in the post table and order details like all the default order meta are stored in the post_meta table
global $wpdb;
// Get all customer orders
$subscriptions = get_posts(array(
'numberposts' => -1,
'post_type' => 'shop_subscription', // Subscription post type
'post_status' => 'wc-active', // Active subscription
'orderby' => 'post_date', // ordered by date
'order' => 'ASC',
'date_query' => array( // Start & end date
array(
'after' => $from_date,
'before' => $to_date,
'inclusive' => true,
),
),
));
I found this way much useful and also if you need to get the order custom meta fields then those fields are stored in the woocommerce_order_itemmeta table but to fetch these you need order_item_meta id which you can get from the table woocommerce_order_items, you can use the code below giving it the orderIds array containing the order ids:
foreach ($orderIds as $orderId) {
$result = $wpdb->get_results($wpdb->prepare(
"
SELECT m.meta_value,i.order_item_name
FROM {$wpdb->prefix}woocommerce_order_itemmeta as m
INNER JOIN {$wpdb->prefix}woocommerce_order_items as i ON
m.order_item_id = i.order_item_id
WHERE `order_id` = %s and i.order_item_type = 'line_item'
and m.meta_key = '_wapf_meta'
",
"$orderId"
), object);
$results[] = $result;
}