framework/base/ErrorException.php
public static function isFatalError($error)
    {
        return isset($error['type']) && in_array($error['type'], [E_ERROR, E_PARSE, E_CORE_ERROR, E_CORE_WARNING, E_COMPILE_ERROR, E_COMPILE_WARNING, self::E_HHVM_FATAL_ERROR]);
    }
public static function isFatalError($error)
    {
        return isset($error['type']) && in_array($error['type'], [E_ERROR, E_PARSE, E_CORE_ERROR, E_CORE_WARNING, E_COMPILE_ERROR, E_COMPILE_WARNING, self::E_HHVM_FATAL_ERROR]);
    }
Returns if error is one of fatal type.

@param array $error error got from error_get_last()
@return bool if error is one of fatal type