setup.php

<?php

define('PLUGIN_VERSION', '2.1.0');

/**
 * Init the hooks of the plugins - Needed
 *
 * @return void
 */
function plugin_init_reservation() {
   global $PLUGIN_HOOKS;

   $PLUGIN_HOOKS['csrf_compliant']['reservation'] = true;
   $PLUGIN_HOOKS['add_css']['reservation'][] = "css/views.css";
   $PLUGIN_HOOKS['add_javascript']['reservation'] = ['js/tools.js'];
   $PLUGIN_HOOKS['config_page']['reservation'] = 'front/config.form.php';
   $PLUGIN_HOOKS['item_add']['reservation'] = ['Reservation' => 'plugin_item_add_reservation'];
   $PLUGIN_HOOKS['item_update']['reservation'] = ['Reservation' => 'plugin_item_update_reservation'];
   $PLUGIN_HOOKS['item_purge']['reservation'] = ['Reservation' => 'plugin_item_purge_reservation'];
   $PLUGIN_HOOKS['menu_toadd']['reservation'] = ['plugins' => 'PluginReservationMenu'];

   Plugin::registerClass('PluginReservationMenu');
   Plugin::registerClass('PluginReservationConfig');
   Plugin::registerClass('PluginReservationReservation');
   Plugin::registerClass('PluginReservationTask');
   Plugin::registerClass('PluginReservationApi');

   // Notifications
   $PLUGIN_HOOKS['item_get_events']['reservation'] =
   [ 'NotificationTargetReservation' => [ 'PluginReservationTask', 'addEvents' ] ];

   if (Session::getLoginUserID()) {
      $PLUGIN_HOOKS['menu_entry']['reservation'] = 'front/reservation.php';
   }
}

/**
 * Get the name and the version of the plugin - Needed
 *
 * @return array
 */
function plugin_version_reservation() {
   return [
      'name' => 'Reservation',
      'version' => PLUGIN_VERSION,
      'author' => 'Sylvain Allemand',
      'license' => 'GLPv3',
      'homepage' => 'https://github.com/salleman33/reservation',
      'requirements' => [
         'glpi' => [
            'min' => '9.3',
            'dev' => true,
         ],
      ],
   ];
}

/**
 * Optional : check prerequisites before install : may print errors or add to message after redirect
 *
 * @return boolean
 */
function plugin_reservation_check_prerequisites() {
   return true;
}

/**
 * Check configuration process for plugin : need to return true if succeeded
 * Can display a message only if failure and $verbose is true
 *
 * @param boolean $verbose Enable verbosity. Default to false
 *
 * @return boolean
 */
function plugin_reservation_check_config($verbose = false) {
   if (true) { // Your configuration check
      return true;
   }

   if ($verbose) {
      echo 'Installed / not configured';
   }
   return false;
}