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application/helpers/installation_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       v1.1.0
+ * ---------------------------------------------------------------------------- */
+
+/**
+ * Check if Easy!Appointments is installed.
+ *
+ * This function will check some factors to determine if Easy!Appointments is installed or not. It is possible that the
+ * installation is properly configure without being recognized by this method.
+ *
+ * Notice: You can add more checks into this file in order to further check the installation state of the application.
+ *
+ * @return bool Returns whether E!A is installed or not.
+ */
+function is_app_installed(): bool
+{
+    $CI = &get_instance();
+
+    return $CI->db->table_exists('users');
+}