Question

还是初学者所以请耐心等待...... 所以我发现这个函数用于系统正常运行时间并且一直在讨论它，因为我一般都学习php和web开发。
我的目标是让输出看起来像天：小时：分钟：秒但是没有$ seconds变量所以我根据我的其他内容添加了该行。一切都很好，除了秒只显示为0.我不太确定我做错了什么，或者这是否是最好的方法。

function Uptime() {

    $uptime = @file_get_contents( "/proc/uptime");

    $uptime = explode(" ",$uptime);
    $uptime = $uptime[0];
    $days = explode(".",(($uptime % 31556926) / 86400));
    $hours = explode(".",((($uptime % 31556926) % 86400) / 3600));
    $minutes = explode(".",(((($uptime % 31556926) % 86400) % 3600) / 60));
    $seconds = explode(".",((((($uptime % 31556926) % 86400) % 3600) / 60) / 60));

    $time = $days[0].":".$hours[0].":".$minutes[0].":".$seconds[0];

    return $time;

}

编辑：我能够以不同的方式使用新功能。如果有人能回答为什么上述方法没有按预期工作，并且下面的新方法是实现这一目标的最佳方法，我仍然很好奇。

function Uptime() {
    $ut = strtok( exec( "cat /proc/uptime" ), "." );
    $days = sprintf( "%2d", ($ut/(3600*24)) );
    $hours = sprintf( "%2d", ( ($ut % (3600*24)) / 3600) );
    $min = sprintf( "%2d", ($ut % (3600*24) % 3600)/60  );
    $sec = sprintf( "%2d", ($ut % (3600*24) % 3600)%60  );


    return array( $days, $hours, $min, $sec );
}
$ut = Uptime();
echo "Uptime: $ut[0]:$ut[1]:$ut[2]:$ut[3]";

编辑2：我认为最后一种方法是最好的，基于nwellnhof给出的答案。我不得不调整一下以获得完全符合我想要的输出。谢谢你们。

function Uptime() {
        $str   = @file_get_contents('/proc/uptime');
        $num   = floatval($str);
        $secs  = $num % 60;
        $num   = (int)($num / 60);
        $mins  = $num % 60;
        $num   = (int)($num / 60);
        $hours = $num % 24;
        $num   = (int)($num / 24);
        $days  = $num;

        return array(
            "days"  => $days,
            "hours" => $hours,
            "mins"  => $mins,
            "secs"  => $secs
        );
    }

Answer 1

直接从/proc/uptime阅读是Linux上最有效的解决方案。有多种方法可将输出转换为天/小时/分钟/秒。尝试类似：

$str   = @file_get_contents('/proc/uptime');
$num   = floatval($str);
$secs  = fmod($num, 60); $num = (int)($num / 60);
$mins  = $num % 60;      $num = (int)($num / 60);
$hours = $num % 24;      $num = (int)($num / 24);
$days  = $num;

或者，intdiv（PHP7）：

$str   = @file_get_contents('/proc/uptime');
$num   = floatval($str);
$secs  = fmod($num, 60); $num = intdiv($num, 60);
$mins  = $num % 60;      $num = intdiv($num, 60);
$hours = $num % 24;      $num = intdiv($num, 24);
$days  = $num;

Answer 2

ConnectionHandler支持uptime命令行选项。你可以使用这段简单的代码：

-p

Answer 3

如果只是查看语句中的模式，可以看到秒中的模式不同。它有两个部门。此外，您使用的数字表示每个时间单位的秒数。每秒的秒数应为1，而不是60.简而言之：

$seconds = explode(".",((((($uptime % 31556926) % 86400) % 3600) / 60) / 60));

应该是：

$seconds = explode(".",((((($uptime % 31556926) % 86400) % 3600) % 60) / 1));

现在整个做事方式有点奇怪。例如，(x % (n*m)) % m只是x % m。

更好的方法是：

$uptime  = (int) $uptime;
$seconds =  $uptime               % 60;
$minutes = ($uptime /  60       ) % 60;
$hours   = ($uptime / (60*60)   ) % 24;
$days    =  $uptime / (60*60*24); # % 365, if you want

Answer 4

您作为班级的初始示例的变体：

class Uptime {
    private $uptime;

    private $modVals = array(31556926, 86400, 3600, 60, 60);

    public function __construct() {
        $this->read_uptime();
    }

    /**
     * actually trigger a read of the system clock and cache the value
     * @return string
     */
    private function read_uptime() {
        $uptime_raw = @file_get_contents("/proc/uptime");
        $this->uptime = floatval($uptime_raw);
        return $this->uptime;
    }

    private function get_uptime_cached() {
        if(is_null($this->uptime)) $this->read_uptime(); // only read if not yet stored or empty
        return $this->uptime;
    }

    /**
     * recursively run mods on time value up to given depth
     * @param int $d
     * @return int
     **/
    private function doModDep($d) {
        $start = $this->get_uptime_cached();
        for($i=0;$i<$d;$i++) {
            $start = $start % $this->modVals[$i];
        }
        return intval($start / $this->modVals[$d]);
    }

    public function getDays()
    {
        return $this->doModDep(1);
    }

    public function getHours() {
        return $this->doModDep(2);
    }

    public function getMinutes()
    {
        return $this->doModDep(3);
    }

    public function getSeconds()
    {
        return $this->doModDep(4);
    }

    public function getTime($cached=false) {
        if($cached != false) $this->read_uptime(); // resample cached system clock value
        return sprintf("%03d:%02d:%02d:%02d", $this->getDays(), $this->getHours(), $this->getMinutes(), $this->getSeconds());
    }
}

Answer 5

在Unix / BSD上，使用/proc是不可靠的，因为默认情况下没有安装它，在某些Linux发行版上它也可以卸载，所以使用{{1}解析它会更好}或uptime命令，例如

`sysctl`

sysctl

或：

<?php
preg_match('/sec = (\d+)/', shell_exec('sysctl -n kern.boottime'), $secs)
echo $secs[1];

或根据m0n0wall提供的示例：

$s = explode( " ", exec("/sbin/sysctl -n kern.boottime") );
$a = str_replace( ",", "", $s[3]);
$uptime = time() - $a;

<?php exec("/sbin/sysctl -n kern.boottime", $boottime); preg_match("/sec = (\d+)/", $boottime[0], $matches); $boottime = $matches[1]; $uptime = time() - $boottime; if ($uptime > 60) $uptime += 30; $updays = (int)($uptime / 86400); $uptime %= 86400; $uphours = (int)($uptime / 3600); $uptime %= 3600; $upmins = (int)($uptime / 60); $uptimestr = ""; if ($updays > 1) $uptimestr .= "$updays days, "; else if ($updays > 0) $uptimestr .= "1 day, "; $uptimestr .= sprintf("%02d:%02d", $uphours, $upmins); echo htmlspecialchars($uptimestr);

取自4webhelp：

的示例

uptime

或（在FreeBSD上测试）：

<?php
$data = shell_exec('uptime');
$uptime = explode(' up ', $data);
$uptime = explode(',', $uptime[1]);
$uptime = $uptime[0].', '.$uptime[1];
echo ('Current server uptime: '.$uptime.'

这是适用于Windows的版本：

$uptime = exec("uptime");
$uptime = split(" ",$uptime);
$days = $uptime[3]; # NetBSD: $days = $uptime[4];
$time = split(",",$uptime[5]); # NetBSD: $time = split(",",$uptime[7]);
if (sizeof($hourmin = split(":",$time[0])) < 2){ ;
  $hours = "0";
  $mins = $hourmin[0];
} else {
  $hourmin=split(":",$time[0]);
  $hours = $hourmin[0];
  $mins = $hourmin[1];
}
$calcuptime =  "Uptime: ".$days." days ".$hours." hours ".$mins." mins" ;
echo $calcuptime;

如何在php中显示系统正常运行时间？

5 个答案:

`sysctl`