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 seconds 和 nanoseconds。

    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

    发现了问题？

    了解如何改进此页面 • 提交拉取请求 • 报告一个错误
    ＋添加备注

    用户贡献的备注 4 notes

    up
    7
    m at kufi dot net
    19 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($microtime)    {//optimizations added by me [start]//sleep the full secondssleep(intval($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
    6
    anybody (a) emuxperts.net
    18 years ago
    Documentation states that "seconds" must be positive. This is not correct, 0 is possible.Rather, "seconds" must be non-negative.
    up
    6
    fantasysportswire at yahoo dot com
    18 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
    3
    b dot andrew at shaw dot ca
    17 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:<?phpfunction 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!
    ＋添加备注
    To Top