.php

<?php
/**
 * Get Sales total from a REMOTE .json file
 *
 * @link https://shopicruit.myshopify.com/admin/orders.json?page=1&access_token=c32313df0d0ef512ca64d5b336a0d7c6
 * @author François Forest
 * @version 1.0.0
 */
Class ShopifyIntern
{

    /**
     * API endpoint to fetch the data
     *
     * @var string
     */
    private $api_endpoint = 'https://shopicruit.myshopify.com/admin/orders.json';

    /**
     * Orders array
     *
     * @var array
     */
    private $orders = array();

    /**
     * Current page
     *
     * @var int
     */
    private $page = 0;

    /**
     * Token for the API auth
     *
     * @var string
     */
    private $access_token = 'c32313df0d0ef512ca64d5b336a0d7c6';

    /**
     * ShopifyIntern constructor.
     */
    public function __construct()
    {

        // We get the order from all pages
        do {
            $paged_orders = $this->getOrders();
        } while(!empty($paged_orders));

        print_r($this->getTotal());

    }

    /**
     * Build a query ready for teh API
     *
     * @return string
     */
    private function buildQuery()
    {

        // We increase the page number
        $this->page = $this->page + 1;

        // We return the URL
        return $this->api_endpoint . '?access_token='. $this->access_token .'&page='. $this->page;

    }

    /**
     * Sum every update total price to get the turnover
     *
     * Important, the global $this->orders contains a sub array [0],
     * could be removed easily on a second version though
     *
     * @return int - USD amount
     */
    private function getTotal() {

        $total = 0;

        if(empty($this->orders))
            return $total;

        // We loop through all the orders
        foreach ($this->orders[0] as $order) {
            $total += $order->total_price;
        }

        return $total;

    }

    /**
     * Retrieve the orders using CURL
     *
     * @return array of Shopify orders
     */
    private function getOrders() {

        //  Initiate curl
        $ch = curl_init();
        // We don't want to output it
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        // Let's grab our data
        curl_setopt($ch, CURLOPT_URL,$this->buildQuery());
        $results = curl_exec($ch);
        // Decode the JSON
        $decoded_result = json_decode($results);

        if(!empty($decoded_result->orders)) {
            // We add the returned orders to our global handler
            array_push($this->orders, $decoded_result->orders);
            // We return it so we know we can keep it going
            $returned = $this->orders;
        } else {
            $returned = array();
        }

        // Close curl
        curl_close($ch);

        return $returned;

    }


}

// Here is where the magic starts.
new ShopifyIntern();