/**
  * @return true[]
  */
 public function getBootstrapModules()
 {
     $bootstrap_modules = array();
     foreach ($this->discoverModuleFilenames('module') as $name => $filename) {
         $php = file_get_contents($filename);
         foreach (PureFunctions::bootstrapHooks() as $hook) {
             if (FALSE !== strpos($php, 'function ' . $name . '_' . $hook)) {
                 $bootstrap_modules[$name] = TRUE;
                 break;
             }
         }
     }
     return $bootstrap_modules;
 }