function error_reporting (level) {
  // http://kevin.vanzonneveld.net
  // +   original by: Brett Zamir (http://brett-zamir.me)
  // -    depends on: ini_set
  // %        note 1: This will not set a global_value or access level for the ini item
  // %        note 2: If you wish the default value to be as in PHP, you must manually set it
  // %        note 3: This function depends on functions implementing error handling
  // %        note 4: See also our at() error suppressor function (@ operator in PHP) in experimental/language/
  // *     example 1: error_reporting(1);
  // *     returns 1: 6135
  return this.ini_set('error_reporting', level);
}

error_reporting(1);

6135