Delays the program execution for the given number of seconds.
Halt time in seconds.
Returns zero on success, or false on error.
If the call was interrupted by a signal, sleep returns a non-zero value. On Windows, this value will always be 192 (the value of the WAIT_IO_COMPLETION constant within the Windows API). On other platforms, the return value will be the number of seconds left to sleep.
Exceptions and Errors
If the specified number of seconds is negative, this function will generate a E_WARNING.