posix_times

(PHP 4, PHP 5, PHP 7, PHP 8)

posix_times — Get process times

说明

posix_times ( ) : array|false

Gets information about the current CPU usage.

参数

此函数没有参数。

返回值

Returns a hash of strings with information about the current process CPU usage. The indices of the hash are:

ticks - the number of clock ticks that have elapsed since reboot.
utime - user time used by the current process.
stime - system time used by the current process.
cutime - user time used by current process and children.
cstime - system time used by current process and children.

The function returns false on failure.

范例

Example #1 Example use of posix_times()


<?php

$times = posix_times();

print_r($times);
?>

以上例程的输出类似于：

Array
(
    [ticks] => 25814410
    [utime] => 1
    [stime] => 1
    [cutime] => 0
    [cstime] => 0
)

注释

Warning

This function isn't reliable to use, it may return negative values for high times.

User Contributed Notes

brain at winbot dot co dot uk 26-Jun-2004 06:14


doesnt work with freebsd. as stated above the clock ticks at different intervals on different platforms.



for system uptime consider piping the uptime command or similar, depending on if performance is an issue or not.

not_rich_yet at hotmail dot com 19-Jul-2003 04:21


If you want the output to be 'grammatically correct' then try the following code.  It will eg print '1 minute' as opposed to '1 minutes', the same goes for days and hours:



Put the following code somewhere in the head of the page code:



<?php

function uptime() {

if (!$times = posix_times() ) {

return ("unknown");

} else {

$now = $times['ticks'];

$days = intval($now / (60*60*24*100));

$remainder = $now % (60*60*24*100);

$hours = intval($remainder / (60*60*100));

$remainder = $remainder % (60*60*100);

$minutes = intval($remainder / (60*100));

if ($days == 1) {$writeDays = "day";} else {$writeDays = "days";}

if ($hours == 1) {$writeHours = "hour"; } else {$writeHours = "hours";}

if ($minutes == 1) {$writeMins = "minute";} else {$writeMins = "minutes";}

return ("$days $writeDays, $hours $writeHours, $minutes $writeMins");

}

}

?>



Then put this bit where you want the info displayed:



<?php

print uptime();

?>



Regards,



nry

murphy at nmc-online dot co dot uk 17-Jun-2003 11:01


I am not sure why, and it could just be me but on my FreeBSD system using

$time = posix_times();

$time['ticks'] is an enormous value that bears no relation to the system uptime (I tested by rebooting the system,  the number does not change).

I checked my timecounters, they tick every 10.000msec and I did the maths on the returned value and it suggested the machine had been up for over 200 days - it was reformatted about a week ago.

This could be to do with FreeBSD, or *BSD, or just *idiots like me but just check before you use the function.

 ~

FreeBSD 5.1-R, Apache 2.0.46, PHP4.3.2

rossz+php at vamos-wentworth dot org 20-Nov-2002 01:42


This function will return the system uptime as a human readable string such as "172 days, 18 hours, 15 minutes".  I didn't bother to handle singular so the grammar could be a bit off, e.g. 1 hours.



function uptime() {

  if (!$times = posix_times()) {

    return ("unknown");

  } else {

    $now = $times['ticks'];

    $days = intval($now / (60*60*24*100));

    $remainder = $now % (60*60*24*100);

    $hours = intval($remainder / (60*60*100));

    $remainder = $remainder % (60*60*100);

    $minutes = intval($remainder / (60*100));

    return ("$days days, $hours hours, $minutes minutes");

  }

}