sleep(3) [php man page]

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)

SLEEP(1)						    BSD General Commands Manual 						  SLEEP(1)

NAME

     sleep -- suspend execution for an interval of time

SYNOPSIS

     sleep seconds

DESCRIPTION

     The sleep command suspends execution for a minimum of seconds.

     If the sleep command receives a signal, it takes the standard action.

IMPLEMENTATION NOTES

     The SIGALRM signal is not handled specially by this implementation.

     The sleep command will accept and honor a non-integer number of specified seconds (with a '.' character as a decimal point).  This is a non-
     portable extension, and its use will nearly guarantee that a shell script will not execute properly on another system.

EXAMPLES

     To schedule the execution of a command for x number seconds later (with csh(1)):

	   (sleep 1800; sh command_file >& errors)&

     This incantation would wait a half hour before running the script command_file.  (See the at(1) utility.)

     To reiteratively run a command (with the csh(1)):

	   while (1)
		   if (! -r zzz.rawdata) then
			   sleep 300
		   else
			   foreach i (`ls *.rawdata`)
				   sleep 70
				   awk -f collapse_data $i >> results
			   end
			   break
		   endif
	   end

     The scenario for a script such as this might be: a program currently running is taking longer than expected to process a series of files, and
     it would be nice to have another program start processing the files created by the first program as soon as it is finished (when zzz.rawdata
     is created).  The script checks every five minutes for the file zzz.rawdata, when the file is found, then another portion processing is done
     courteously by sleeping for 70 seconds in between each awk job.

DIAGNOSTICS

     The sleep utility exits 0 on success, and >0 if an error occurs.

SEE ALSO

     nanosleep(2), sleep(3)

STANDARDS

     The sleep command is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible.

HISTORY

     A sleep command appeared in Version 4 AT&T UNIX.

BSD
								  April 18, 1994							       BSD