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time_nanosleep

(PHP 5, PHP 7, PHP 8)

time_nanosleep延缓执行若干秒和纳秒

说明

time_nanosleep(int $seconds, int $nanoseconds): array|bool

程序延缓执行指定数量的 secondsnanoseconds

参数

seconds

必须是一个非负整数。

nanoseconds

必须是一个小于1亿的非负整数。

注意: 在 Windows 上,系统的睡眠时间可能会超过指定的纳秒数,具体取决于硬件。

返回值

成功时返回 true, 或者在失败时返回 false

如果延迟被中断,一个关联数组会返回,内容为:

  • seconds——延迟剩余未执行的秒数
  • nanoseconds——延迟剩余未执行的纳秒数

示例

示例 #1 time_nanosleep() 示例

<?php
// 小心!如果返回数组,将无法按照预期工作
if (time_nanosleep(0, 500000000)) {
echo
"Slept for half a second.\n";
}

// 这个更好:
if (time_nanosleep(0, 500000000) === true) {
echo
"Slept for half a second.\n";
}

// 这个最好:
$nano = time_nanosleep(2, 100000);

if (
$nano === true) {
echo
"Slept for 2 seconds, 100 microseconds.\n";
} elseif (
$nano === false) {
echo
"Sleeping failed.\n";
} elseif (
is_array($nano)) {
$seconds = $nano['seconds'];
$nanoseconds = $nano['nanoseconds'];
echo
"Interrupted by a signal.\n";
echo
"Time remaining: $seconds seconds, $nanoseconds nanoseconds.";
}
?>

参见

add a note

User Contributed Notes 5 notes

up
8
m at kufi dot net
18 years ago
You should take into account, if you use the function replacement down here, the CPU will be in use of 99% for the time of execution...

(A little bit better in this situation is to let the 'full seconds' go by a normal sleep command (makes the thread sleep!, and uses minimum cpu))

<?php
//THIS IS THE FUNCTION WE ARE TALKIN ABOUT
function timeWait($microtime)
{
//optimizations added by me [start]
//sleep the full seconds
sleep(intval($microtime));
//set the microtime to only resleep the last part of the nanos
$microtime = $microtime - intval($microtime);
//optimizations added by me [end]

$timeLimit = $microtime + array_sum(explode(" ",microtime()));
while(
array_sum(explode(" ",microtime())) < $timeLimit)
{
/*DO NOTHING*/}
return(
true);
}

//THIS IS HOW WE CAN USE IT
echo "Process started at " . date("H:i:s") . " and " . current(explode(" ",microtime())) . " nanoseconds.<br>";
timeWait(5.5); //With this call the system will wait 5 seconds and a half. You can use either integer or float.
echo "Process completed at " . date("H:i:s") . " and " . current(explode(" ",microtime())) . " nanoseconds.";
?>
up
5
anybody (a) emuxperts.net
17 years ago
Documentation states that "seconds" must be positive. This is not correct, 0 is possible.

Rather, "seconds" must be non-negative.
up
5
fantasysportswire at yahoo dot com
17 years ago
Just glancing at this - and the note from over a year ago with a implementation for windows.. with 5.0.0 and higher it would be simplier to just do something like......

<?php

if (!function_exists('time_nanosleep')) {

function
time_nanosleep($seconds, $nanoseconds) {

sleep($seconds);
usleep(round($nanoseconds/100));

return
true;

}

}

?>

....off the top of my head - obviously simple enough there should be no mistakes.. but those are the ones that always seem to get ya :( .....
up
2
b dot andrew at shaw dot ca
15 years ago
A response to the note below:

Your function is also useless, as the WinNT 32 kernel only functions at a minimum of about 10+ ms (1,000 us), rendering usleep() useless, because usleep uses the C function which is provided by the system (in this case, kernel32.dll).

You'll want to use a function that does not rely on the kernel, but rather something made for precise measurement:

<?php
function usleep_win( $micro_seconds )
{
if ( @
function_exists( "socket_create" ) && @function_exists( "socket_select" ) )
{
$false = NULL;
$socket = array( socket_create( AF_INET, SOCK_RAW, $false ) );
socket_select( $false, $false, $socket, 0, $micro_seconds );
return
true;
}
else
{
return
false;
}
}
?>

This function will allow to you sleep for a specified microsecond, although I have measured it to be off by ~5 us.

Again, most of this depends on the hardware in your system. If you _REALLY_ need to be precise to < 10 us, you shouldn't be using WinNT anyways!
up
-11
tecnomaniac at ig dot com dot br
18 years ago
This is an alternative function to sleep_nanosecond that you can use with PHP versions below PHP 5.0. It is not very accurate if we talk about nanoseconds but the results are satisfatory. Enjoy!

<?php
//THIS IS THE FUNCTION WE ARE TALKIN ABOUT
function timeWait($microtime)
{
$timeLimit = $microtime + array_sum(explode(" ",microtime()));
while(
array_sum(explode(" ",microtime())) < $timeLimit)
{
/*DO NOTHING*/}
return(
true);
}

//THIS IS HOW WE CAN USE IT
echo "Process started at " . date("H:i:s") . " and " . current(explode(" ",microtime())) . " nanoseconds.<br>";
timeWait(5.5); //With this call the system will wait 5 seconds and a half. You can use either integer or float.
echo "Process completed at " . date("H:i:s") . " and " . current(explode(" ",microtime())) . " nanoseconds.";
?>
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