Creating a custom WP CLI command

cli-complete-orders.php

<?php
/*
Plugin Name: Yan&Co complete orders CLI command
Plugin URI: https://www.yanco.dk/
Description: Complete virtual orders CLI command
Author: Yan&Co
Version: 1.0.0
Author URI: https://www.yanco.dk/
*/

class YANCO_CLI {

	/**
	 * Completes Virtual Orders
	 *
	 * @since  0.0.1
	 * @author Yan Knudtskov
	 */
	public function complete_virtual_orders() {
        
        

        $args = array(
            'post_status' => 'wc-processing',
            'post_type' => 'shop_order',
            'posts_per_page' => -1,
        );
    
        $query = new WP_Query( $args );
    
        if( !empty( $query->posts ) ) {

            $progress = \WP_CLI\Utils\make_progress_bar( 'Completing Orders', count( $query->posts ) );

            foreach( $query->posts as $post ) {
                
                $only_virtual = true;
                $order = wc_get_order( $post->ID );
                $order_items = $order->get_items();
    
                foreach( $order_items as $order_item ) {
                    $product_id = $order_item->get_product_id();
    
                    if( $product_id ) {
                        $product = wc_get_product( $product_id );
                        if( $product ) {
                            if( $product->is_virtual() == false ) {
                                $only_virtual = false;
                            }
                        }
                    }
                }
    
                if( $only_virtual == true ) {
                    $order->update_status('completed');
                    // usleep(250000); // Wait for 0,25 seconds
                }

                $progress->tick();
            }

            $progress->finish();
            WP_CLI::success( count( $query->posts ) . ' orders completed!' ); // Prepends Success to message

        }
    
		
	}

}

/**
 * Registers our command when cli get's initialized.
 *
 * @since  1.0.0
 * @author Yan Knudtskov
 */
function yanco_cli_register_commands() {
	WP_CLI::add_command( 'yanco', 'YANCO_CLI' );
}

add_action( 'cli_init', 'yanco_cli_register_commands' );