How to get CPU usage and RAM usage without exec?

Question

How does VBulletin get the system information without the use of exec? Is there any other information I can get about the server without exec? I am interested i

Answer 1

This is what I use on Linux servers. It still uses exec, but other questions point here as duplicate, and there is no [good] suggestion for those. It should work on every distro, but if it doesn't, try messing with $get_cores + 1 offset.

CPU in percent of cores used (5 min avg):

$exec_loads = sys_getloadavg();
$exec_cores = trim(shell_exec("grep -P '^processor' /proc/cpuinfo|wc -l"));
$cpu = round($exec_loads[1]/($exec_cores + 1)*100, 0) . '%';

RAM in percent of total used (realtime):

$exec_free = explode("\n", trim(shell_exec('free')));
$get_mem = preg_split("/[\s]+/", $exec_free[1]);
$mem = round($get_mem[2]/$get_mem[1]*100, 0) . '%';

RAM in GB used (realtime):

$exec_free = explode("\n", trim(shell_exec('free')));
$get_mem = preg_split("/[\s]+/", $exec_free[1]);
$mem = number_format(round($get_mem[2]/1024/1024, 2), 2) . '/' . number_format(round($get_mem[1]/1024/1024, 2), 2);

Here is what's in the $get_mem array if you need to calc other facets:

[0]=>row_title [1]=>mem_total [2]=>mem_used [3]=>mem_free [4]=>mem_shared [5]=>mem_buffers [6]=>mem_cached

Bonus, here is how to get the uptime:

$exec_uptime = preg_split("/[\s]+/", trim(shell_exec('uptime')));
$uptime = $exec_uptime[2] . ' Days';