show_source
This will allow you to use negative values or valuer below 1 second.
<?php slaap(0.5); ?>
<?php
function slaap($seconds)
{
$seconds = abs($seconds);
if ($seconds < 1):
usleep($seconds*1000000);
else:
sleep($seconds);
endif;
}
?>
sleep
(PHP 4, PHP 5)
sleep — Programmverzögerung
Beschreibung
int sleep
( int $seconds
)
Unterbricht die weitere Skript-Ausführung für die angegebene Anzahl von Sekunden .
Parameter-Liste
- seconds
-
Die Unterbrechung in Sekunden
Rückgabewerte
Gibt bei Erfolg null oder im Fehlerfall FALSE zurück. Wenn der Aufruf durch ein Signal unterbrochen wurde, gibt sleep() die Anzahl der Sekunden zurück, die das Programm noch "schlafen" würde.
Fehler/Exceptions
Falls die angegebene Anzahl von Sekunden negativ ist, erzeugt diese Funktion einen Fehler des Typs E_WARNING.
Beispiele
Beispiel #1 sleep()-Beispiel
<?php
// die aktuelle Zeit
echo date('h:i:s') . "\n";
// 10 Sekunden schlafen
sleep(10);
// aufwachen!
echo date('h:i:s') . "\n";
?>
Dieses Beispiel erzeugt nach zehn Sekunden die Ausgabe
05:31:23 05:31:33
Siehe auch
- usleep() - Programm-Verzögerung in Mikrosekunden
- time_nanosleep() - Verzögert die Ausführung um die gegebene Anzahl Sekunden und Nanosekunden
- time_sleep_until() - Lässt das Skript bis zur angegebenen Zeit schlafen
- set_time_limit() - Legt die maximale Ausführungszeit fest
add a note
User Contributed Notessleep
Anonymous
08-Feb-2009 08:32
08-Feb-2009 08:32
webseos at gmail dot com
27-Aug-2008 04:29
27-Aug-2008 04:29
This is a critical thing to use time delay function as sleep() Because a beginner can find that this is not working and he/she will see that all output appearing at a time.
A good way to implement this is by using the function - ob_implicit_flush() then you don't need to use flush() function explicitly.
A sample code :
<?php
ob_implicit_flush(true);
for($i=0;$i<5;$i++)
{
$dis=<<<DIS
<div style="width:200px; background-color:lime;border:1px; text-align:center;text-decoration:blink;">
$i
</div>
DIS;
echo $dis;
sleep(5);
//flush();
}
marpetr at gmail dot com
18-Mar-2008 07:41
18-Mar-2008 07:41
Very useful to prevent password brute forcing! Simply add few seconds timeout to login script and the probability to guess the password decreases a lot!
linus at flowingcreativity dot net
08-Jul-2005 03:07
08-Jul-2005 03:07
This may seem obvious, but I thought I would save someone from something that just confused me: you cannot use sleep() to sleep for fractions of a second. This:
<?php sleep(0.25) ?>
will not work as expected. The 0.25 is cast to an integer, so this is equivalent to sleep(0). To sleep for a quarter of a second, use:
<?php usleep(250000) ?>
MPHH
05-Jul-2003 07:33
05-Jul-2003 07:33
Note: The set_time_limit() function and the configuration directive max_execution_time only affect the execution time of the script itself. Any time spent on activity that happens outside the execution of the script such as system calls using system(), the sleep() function, database queries, etc. is not included when determining the maximum time that the script has been running.
hartmut at six dot de
25-Aug-2000 01:38
25-Aug-2000 01:38
it is a bad idea to use sleep() for delayed output effects as
1) you have to flush() output before you sleep
2) depending on your setup flush() will not work all the way to the browser as the web server might apply buffering of its own or the browser might not render output it thinks not to be complete
netscape for example will only display complete lines and will not show table parts until the </table> tag arrived
so use sleep if you have to wait for events and don't want to burn to much cycles, but don't use it for silly delayed output effects!