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application/helpers/session_helper.php

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+<?php defined('BASEPATH') or exit('No direct script access allowed');
+
+/* ----------------------------------------------------------------------------
+ * Easy!Appointments - Online Appointment Scheduler
+ *
+ * @package     EasyAppointments
+ * @author      A.Tselegidis <alextselegidis@gmail.com>
+ * @copyright   Copyright (c) Alex Tselegidis
+ * @license     https://opensource.org/licenses/GPL-3.0 - GPLv3
+ * @link        https://easyappointments.org
+ * @since       v1.5.0
+ * ---------------------------------------------------------------------------- */
+
+if (!function_exists('session')) {
+    /**
+     * Get / set the specified session value.
+     *
+     * If an array is passed as the key, we will assume you want to set an array of values.
+     *
+     * Example "Get":
+     *
+     * $logged_in = session('logged_in', FALSE);
+     *
+     * Example "Set":
+     *
+     * session(['logged_in' => FALSE]);
+     *
+     * @param array|string|null $key Session item key.
+     * @param mixed|null $default Default value in case the requested session item has no value.
+     *
+     * @return mixed|NULL Returns the requested value or NULL if you assign a new session value.
+     *
+     * @throws InvalidArgumentException
+     */
+    function session(array|string|null $key = null, mixed $default = null): mixed
+    {
+        /** @var EA_Controller $CI */
+        $CI = &get_instance();
+
+        if (empty($key)) {
+            throw new InvalidArgumentException('The $key argument cannot be empty.');
+        }
+
+        if (is_array($key)) {
+            foreach ($key as $item => $value) {
+                $CI->session->set_userdata($item, $value);
+            }
+
+            return null;
+        }
+
+        $value = $CI->session->userdata($key);
+
+        return $value ?? $default;
+    }
+}