php man page for time_sleep_until

TIME_SLEEP_UNTIL(3)							 1						       TIME_SLEEP_UNTIL(3)

time_sleep_until - Make the script sleep until the specified time

SYNOPSIS
       bool time_sleep_until (float  $timestamp)

DESCRIPTION
	Makes the script sleep until the specified $timestamp.

PARAMETERS
	      o $timestamp
		- The timestamp when the script should wake.

RETURN VALUES
	Returns TRUE on success or FALSE on failure.

CHANGELOG
       +--------+---------------------------------------------------+
       |Version |						    |
       |	|						    |
       |	|		     Description		    |
       |	|						    |
       +--------+---------------------------------------------------+
       | 5.3.0	|						    |
       |	|						    |
       |	|  This  function is now available on Windows plat- |
       |	| forms.					    |
       |	|						    |
       +--------+---------------------------------------------------+
ERRORS
/EXCEPTIONS
	If the specified $timestamp is in the past, this function will generate a E_WARNING.

EXAMPLES
       Example #1

	      A time_sleep_until(3) example

	      <?php

	      //returns false and generates a warning
	      var_dump(time_sleep_until(time()-1));

	      // may only work on faster computers, will sleep up to 0.2 seconds
	      var_dump(time_sleep_until(microtime(true)+0.2));

	      ?>

NOTES
       Note

	       All signals will be delivered after the script wakes up.

SEE ALSO
       sleep(3), usleep(3), time_nanosleep(3), set_time_limit(3).

PHP Documentation Group 												       TIME_SLEEP_UNTIL(3)