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usleep(3) [php man page]

USLEEP(3)								 1								 USLEEP(3)

usleep - Delay execution in microseconds

SYNOPSIS
void usleep (int $micro_seconds) DESCRIPTION
Delays program execution for the given number of microseconds. PARAMETERS
o $micro_seconds - Halt time in microseconds. A microsecond is one millionth of a second. RETURN VALUES
No value is returned. EXAMPLES
Example #1 usleep(3) example <?php // Current time echo date('h:i:s') . " "; // wait for 2 seconds usleep(2000000); // back! echo date('h:i:s') . " "; ?> The above example will output: 11:13:28 11:13:30 SEE ALSO
sleep(3), time_nanosleep(3), time_sleep_until(3), set_time_limit(3). PHP Documentation Group USLEEP(3)

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SLEEP(3)								 1								  SLEEP(3)

sleep - Delay execution

SYNOPSIS
int sleep (int $seconds) DESCRIPTION
Delays the program execution for the given number of $seconds. PARAMETERS
o $seconds - Halt time in seconds. RETURN VALUES
Returns zero on success, or FALSE on error. If the call was interrupted by a signal, sleep(3) 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. ERRORS
/EXCEPTIONS If the specified number of $seconds is negative, this function will generate a E_WARNING. CHANGELOG
+--------+---------------------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------------------+ | 5.3.4 | | | | | | | Before PHP 5.3.4, on Windows, sleep(3) always | | | returns NULL when sleep has occurred, regardless | | | of whether the sleep was interrupted or not. | | | | +--------+---------------------------------------------------+ EXAMPLES
Example #1 sleep(3) example <?php // current time echo date('h:i:s') . " "; // sleep for 10 seconds sleep(10); // wake up ! echo date('h:i:s') . " "; ?> This example will output (after 10 seconds) 05:31:23 05:31:33 SEE ALSO
usleep(3), time_nanosleep(3), time_sleep_until(3), set_time_limit(3). PHP Documentation Group SLEEP(3)
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