admin/model/extension/dashboard/chart.php

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<?php
class ModelExtensionDashboardChart extends Model {
	public function getTotalOrdersByDay() {
		$implode = array();

		foreach ($this->config->get('config_complete_status') as $order_status_id) {
			$implode[] = "'" . (int)$order_status_id . "'";
		}

		$order_data = array();

		for ($i = 0; $i < 24; $i++) {
			$order_data[$i] = array(
				'hour'  => $i,
				'total' => 0
			);
		}

		$query = $this->db->query("SELECT COUNT(*) AS total, HOUR(date_added) AS hour FROM `" . DB_PREFIX . "order` WHERE order_status_id IN(" . implode(",", $implode) . ") AND DATE(date_added) = DATE(NOW()) GROUP BY HOUR(date_added) ORDER BY date_added ASC");

		foreach ($query->rows as $result) {
			$order_data[$result['hour']] = array(
				'hour'  => $result['hour'],
				'total' => $result['total']
			);
		}

		return $order_data;
	}

	public function getTotalOrdersByWeek() {
		$implode = array();

		foreach ($this->config->get('config_complete_status') as $order_status_id) {
			$implode[] = "'" . (int)$order_status_id . "'";
		}

		$order_data = array();

		$date_start = strtotime('-' . date('w') . ' days');

		for ($i = 0; $i < 7; $i++) {
			$date = date('Y-m-d', $date_start + ($i * 86400));

			$order_data[date('w', strtotime($date))] = array(
				'day'   => date('D', strtotime($date)),
				'total' => 0
			);
		}

		$query = $this->db->query("SELECT COUNT(*) AS total, date_added FROM `" . DB_PREFIX . "order` WHERE order_status_id IN(" . implode(",", $implode) . ") AND DATE(date_added) >= DATE('" . $this->db->escape(date('Y-m-d', $date_start)) . "') GROUP BY DAYNAME(date_added)");

		foreach ($query->rows as $result) {
			$order_data[date('w', strtotime($result['date_added']))] = array(
				'day'   => date('D', strtotime($result['date_added'])),
				'total' => $result['total']
			);
		}

		return $order_data;