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You should not use sleep() to prevent brute force attacks. This approach does nothing to stop an attacker, and is more likely to result in DOSing your website.
sleep
(PHP 4, PHP 5)
sleep — Откладывает выполнение
Описание
int sleep
( int
$seconds
)
Откладывает исполнение программы на число секунд, заданное параметром
seconds.
Список параметров
-
seconds -
Время остановки в секундах.
Возвращаемые значения
Возвращает 0 при успешном выполнении или FALSE при ошибке.
Если вызов был прерван сигналом, функция sleep()
возвратит значение, не равное нулю. В Windows это значение всегда будет
равно 192 (значение константы Windows API
WAIT_IO_COMPLETION). На других платформах возвращаемое
значение будет числом оставшихся секунд.
Ошибки
Если указанное число секунд в параметре seconds
отрицательно, то функция создаст исключение уровня
E_WARNING.
Список изменений
| Версия | Описание |
|---|---|
| 5.3.4 |
До версии PHP 5.3.4 функция sleep() в Windows
всегда возвращала NULL после завершения ожидания, независимо от
того было ли прервано выполнение функции или нет.
|
Примеры
Пример #1 Пример использования sleep()
<?php
// текущее время
echo date('h:i:s') . "\n";
// ожидание в течении 10 секунд
sleep(10);
// завершение ожидания
echo date('h:i:s') . "\n";
?>
Этот пример выведет (через 10 секунд)
05:31:23 05:31:33
Смотрите также
- usleep() - Откладывает выполнение на микросекунды
- time_nanosleep() - Откладывает исполнение на заданное число секунд и наносекунд
- time_sleep_until() - Откладывает исполнение скрипта до заданного времени
- set_time_limit() - Limits the maximum execution time
add a note
User Contributed Notes
sleep
Bryan
09-Apr-2012 12:00
barlow at fhtsolutions dot com
24-Sep-2011 10:33
You should put sleep into both the pass and fail branches, since an attacker can check whether the response is slow and use that as an indicator - cutting down the delay time. But a delay in both branches eliminates this possibility.
code {@} ashleyhunt [dot] co [dot] uk
30-Jul-2011 10:31
A really simple, but effective way of majorly slowing down bruit force attacks on wrong password attempts.
In my example below, if the end-user gets the password correct, they get to log in at full speed, as expected. For every incorrect password attempt, the users response is delayed by 2 seconds each time; mitigating the chances of a full bruit force attack by a limit of 30 lookups a minute.
I hope this very simple approach will help make your web applications that little bit more secure.
Ashley
<?php
public function handle_login() {
if($uid = user::check_password($_REQUEST['email'], $_REQUEST['password'])) {
return self::authenticate_user($uid);
}
else {
// delay failed output by 2 seconds
// to prevent bruit force attacks
sleep(2);
return self::login_failed();
}
}
?>
soulhunter1987 at post dot ru
18-Aug-2010 04:49
Since sleep() can be interrupted by signals i've made a function which can also be interrupted, but will continue sleeping after the signal arrived (and possibly was handled by callback). It's very useful when you write daemons and need sleep() function to work as long as you 'ordered', but have an ability to accept signals during sleeping.
<?php
function my_sleep($seconds)
{
$start = microtime(true);
for ($i = 1; $i <= $seconds; $i ++) {
@time_sleep_until($start + $i);
}
}
?>
toddjt78 at msn dot com
09-May-2010 11:39
Simple function to report the microtime since last called or the microtime since first called.
<?php
function stopWatch($total = false,$reset = true){
global $first_called;
global $last_called;
$now_time = microtime(true);
if ($last_called === null) {
$last_called = $now_time;
$first_called = $now_time;
}
if ($total) {
$time_diff = $now_time - $first_called;
} else {
$time_diff = $now_time - $last_called;
}
if ($reset)
$last_called = $now_time;
return $time_diff;
}
?>
$reset - if true, resets the last_called value to now
$total - if true, returns the time since first called otherwise returns the time since last called
jimmy at powerzone dot dk
06-Mar-2010 11:26
Notice that sleep() delays execution for the current session, not just the script. Consider the following sample, where two computers invoke the same script from a browser, which doesn't do anything but sleep.
PC 1 [started 14:00:00]: script.php?sleep=10 // Will stop after 10 secs
PC 1 [started 14:00:03]: script.php?sleep=0 // Will stop after 7 secs
PC 2 [started 14:00:05]: script.php?sleep=0 // Will stop immediately
http://php.net/session_write_close may be used to address this problem.
mohd at Bahrain dot Bz
16-Dec-2009 04:12
I hope this code will help somebody to solve the problem of not being able to flush or output the buffer to the browser (I use IE7).
It may work for you with just [ echo str_repeat(".", 4096); ] and without even using ob_... and flush.
<?php
ob_start();
ob_implicit_flush(true);
//[ OR ] echo "..."; ob_flush(); flush();
set_time_limit(0);
function sleep_echo($secs) {
$secs = (int) $secs;
$buffer = str_repeat(".", 4096);
//echo $buffer."\r\n<br />\r\n";
for ($i=0; $i<$secs; $i++) {
echo date("H:i:s", time())." (".($i+1).")"."\r\n<br />\r\n".$buffer."\r\n<br />\r\n";
ob_flush();
flush();
sleep(1);
//usleep(1000000);
}
}
sleep_echo(30);
ob_end_flush();
?>
f dot schima at ccgmbh dot de
10-Nov-2009 09:48
Remember that sleep() means "Let PHP time to do some other stuff".
That means that sleep() can be interrupted by signals. That is important if you work with pcntl_signal() and friends.
Anonymous
08-Feb-2009 03:32
This will allow you to use negative values or valuer below 1 second.
<?php slaap(0.5); ?>
<?php
function slaap($seconds)
{
$seconds = abs($seconds);
if ($seconds < 1):
usleep($seconds*1000000);
else:
sleep($seconds);
endif;
}
?>
webseos at gmail dot com
27-Aug-2008 01:29
This is a critical thing to use time delay function as sleep() Because a beginner can find that this is not working and he/she will see that all output appearing at a time.
A good way to implement this is by using the function - ob_implicit_flush() then you don't need to use flush() function explicitly.
A sample code :
<?php
ob_implicit_flush(true);
for($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 02:41
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 12:07
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 04:33
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 10:38
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!