(PHP 4 >= 4.2.0, PHP 5)
posix_get_last_error -- Retrieve the error number set by the last posix function that failedReturns the errno (error number) set by the last posix function that failed. If no errors exist, 0 is returned. If you're wanting the system error message associated with the errno, use posix_strerror().
See also posix_strerror().