Linux uptime command inside php doesn't show anything

Question

I am trying a linux command for uptime in a php file on a server as below

<p> The uptime for this system is <?php $up_time=shell_exec('uptime');
echo $uptime; ?</p>

But when I open my webpage it just shows :

The uptime for this system is

PHP doesn't appear to be running the command. If I go to command prompt and run uptime, I do see the results.

I am doing ssh into a Linux webserver. The php file resides in my folder on the server.

Have you tried absolute path? /bin/uptime Shell_exec will return null on error. — Joshua Bixler, Apr 24 '14 at 02:48
You should see this question http://stackoverflow.com/questions/5882650/how-to-execute-a-shell-script-in-php — sanrodari, Apr 24 '14 at 02:52

score 0 · Accepted Answer · answered Apr 24 '14 at 03:02

0

I think the following code will work.

The uptime for this system is <?php passthru('/usr/bin/uptime'); ?>

executing system command in a php, I suggest you always provide the full path of the command.

answered Apr 24 '14 at 03:02

Xing Fei

Hi - Thanks a lot. It worked but there is a difference between what I get from the php command and what I get if I write uptime on the terminal. In php I get the following "The uptime for this system is 00:21:47 up 77 days, 9:58, 0 users, load average: 0.00, 0.00, 0.00" But on the terminal I get the following "00:21:42 up 755 days, 22:16, 4 users, load average: 0.00, 0.00, 0.00 " would you know why? – Apr 24 '14 at 03:20
do you execute commands on the same machine? 77days <<< 755days! – Xing Fei Apr 24 '14 at 07:20

score 0 · Answer 2 · edited May 10 '23 at 10:01

0

Linux server uptime can be easily obtained in PHP using the /proc/uptime

$uptimeseconds = (int)shell_exec('cat /proc/uptime');
echo "This server has been running for $uptimeseconds seconds.\n";

edited May 10 '23 at 10:01

helvete

answered May 08 '23 at 17:17

Frank Koenen

2 Answers2