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Remember that sleep() means "Let PHP time to do some other stuff".
That means that sleep() can be interrupted by signals. That is important if you work with pcntl_signal() and friends.
sleep
(PHP 4, PHP 5)
sleep — Atrasa a execução do script
Descrição
int sleep
( int $seconds
)
Atrasa a execução do programa por um dado número de seconds .
Parâmetros
- seconds
-
Tempo de parada em segundos.
Valor Retornado
Retorna zero em sucesso, ou FALSE em erros.
Erros
Se o número especificado de seconds é negativo, esta função irá gerar um E_WARNING.
Exemplos
Exemplo #1 Exemplo da sleep()
<?php
// Hora atual
echo date('h:i:s') . "\n";
// Dorme por 10 segundos
sleep(10);
// Acorde!
echo date('h:i:s') . "\n";
?>
Este exemplo irá mostrar(depois de 10 segundos)
05:31:23 05:31:33
Veja Também
usleep() - Atrasa a execução em milionésimos de segundo, set_time_limit() - Limita o tempo de execução do script
add a note
User Contributed Notessleep
f dot schima at ccgmbh dot de
10-Nov-2009 12:48
10-Nov-2009 12:48
Anonymous
08-Feb-2009 06:32
08-Feb-2009 06:32
This will allow you to use negative values or valuer below 1 second.
<?php slaap(0.5); ?>
<?php
function slaap($seconds)
{
$seconds = abs($seconds);
if ($seconds < 1):
usleep($seconds*1000000);
else:
sleep($seconds);
endif;
}
?>
webseos at gmail dot com
27-Aug-2008 02:29
27-Aug-2008 02:29
This is a critical thing to use time delay function as sleep() Because a beginner can find that this is not working and he/she will see that all output appearing at a time.
A good way to implement this is by using the function - ob_implicit_flush() then you don't need to use flush() function explicitly.
A sample code :
<?php
ob_implicit_flush(true);
for($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 05:41
18-Mar-2008 05:41
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 01:07
08-Jul-2005 01:07
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 05:33
05-Jul-2003 05:33
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 11:38
25-Aug-2000 11:38
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!