sleep Delay execution &reftitle.description; intsleep intseconds Delays the program execution for the given number of seconds. In order to delay program execution for a fraction of a second, use usleep as the sleep function expects an &integer;. For example, sleep(0.25) will pause program execution for 0 seconds. &reftitle.parameters; seconds Halt time in seconds (must be greater than or equal to 0). &reftitle.returnvalues; Returns zero on success. 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. &reftitle.errors; If the specified number of seconds is negative, this function will throw a ValueError. &reftitle.changelog; &Version; &Description; 8.0.0 The function throws a ValueError on negative seconds; previously, an E_WARNING was raised instead, and the function returned &false;. &reftitle.examples; ]]> This example will output (after 10 seconds) &reftitle.seealso; usleep time_nanosleep time_sleep_until set_time_limit