time_sleep_until

(PHP 5 >= 5.1.0, PHP 7, PHP 8)

time_sleep_until — 指定した時刻まで実行を遅延する

説明

time_sleep_until(float $timestamp): bool

指定した timestamp までスクリプトの実行を遅延させます。

パラメータ

timestamp: スクリプトが再開する時刻。

戻り値

成功した場合に true を、失敗した場合に false を返します。

エラー / 例外

過去の timestamp を指定した場合、この関数は E_WARNING を発生させます。

例

例1 time_sleep_until() の例

<?php

// false を返し、警告を発生します
var_dump(time_sleep_until(time()-1));

// 高速なコンピュータ上でのみ動作します。実行を 0.2 秒遅延します。
var_dump(time_sleep_until(microtime(true)+0.2));

?>

注意

注意: すべてのシグナルは、スクリプトが再開した後で送信されます。

参考

sleep() - 実行を遅延させる
usleep() - マイクロ秒単位で実行を遅延する
time_nanosleep() - 秒およびナノ秒単位で実行を遅延する
set_time_limit() - 実行時間の最大値を制限する

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User Contributed Notes 3 notes

down

purdue at nc dot rr dot com ¶

13 years ago

At least on my Windows machine, the time_sleep_until function appears to calculate the number of microseconds between now and the sleep-until timestamp, and it appears to use unsigned 32-bit math in this calculation.  This roundoff leads to a maximum sleep time of just under 4295 seconds (1 hour, 11 minutes, 35 seconds).  To get longer sleep times, while still using time_sleep_until to minimize processor overhead, the following loop may be some help to you:

<?php

$sleepuntil = strtotime("tuesday 3pm");

while (time() < $sleepuntil)
   time_sleep_until($sleepuntil);

// proceed with dated processing

?>

Of course, one could use something like "cron" instead, to avoid the script doing the extended sleep.  Also note that time_nanosleep appears to do similar math, but it is somewhat more intuitive that the seconds parameter has an upper limit on what it can be.  Still, both functions might report a warning when waking up prematurely due to roundoff.

down

-2

rowan dot collins at cwtdigital dot com ¶

12 years ago

Not realising that this function existed, I wrote something similar, but it has the additional facility to specify a minimum pause even if the target time has already been reached, for instance in a processor-intensive loop.

It's in seconds rather than microseconds (it's intended for heavy-duty CLI scripts), but that could easily be changed by using microtime(true) and usleep if greater granularity was required.

<?php
    /**
     * Pause processing until the specified time, to avoid hammering a DB or service
     *
     * @param int $target_time Timestamp
     * @param int $min_sleep Always sleep for a minimum number of seconds,
     *    even if the target timestamp has already passed.
     *     Default 0, meaning only sleep until the target timestamp is reached.
     *
     * @example <code>
         while ( ! $finished )
         {
             $minimum_start_of_next_loop = time() + $min_secs_per_loop;
             
             # DO STUFF THAT MAY OR MAY NOT TAKE VERY LONG
             
             sleep_until( $minimum_start_of_next_loop, $min_pause_between_loops );
         }
     </code>
     */
    function sleep_until($target_time, $min_sleep = 0)
    {
        $time_now = time();
        
        $time_to_target = $target_time - $time_now;
        
        // If we've already reached the target time, that's fine
        if ( $time_to_target <= $min_sleep )
        {
            // If required, sleep for a bit anyway
            sleep( $min_sleep );
        }
        else
        {
            // Sleep for the number of seconds until the target time
            sleep( $time_to_target );
        }
    }
?>

down

-4

divinity76 at gmail dot com ¶

5 years ago

if you for some reason need a constant-time implementation of realpath(), try

<?php

function realpath_constant_time(string $path, float $target_seconds, bool &$constant_time_success = null){
    $start_time=microtime(true);
    $ret=realpath($path);
    $constant_time_success = @time_sleep_until($start_time+$target_seconds);
    return $ret;
}
?>

for example, a realtime that always uses exactly 1 millisecond (should be more than enough for SSD-based servers, perhaps rotating harddrive based servers may need something closer to 10 milliseconds, i don't know):

<?php
realpath_constant_time("/path/to/../to/file.txt",0.001,$constant_time_success);
?>

and you can use $constant_time_success to see if you needed more time (and thus failed to do realpath() in constant-time), or if you succeeded.

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