Combine sar system stats

SystemStats.php

<?php
/**
 * sar documentation http://linux.die.net/man/1/sar
 */
class SystemStats
{
	function __construct($sar)
	{
		$this->sar = $sar;
	}

	function run()
	{
		$return = array();
		foreach($this->sar as $type => $opt)
		{
			$results = self::runCommand($opt['cmd']);
			$return = self::formatValues($return,$results,$type,$opt['map']);
		}

		return json_encode($return);
	}

	function runCommand($cmd)
	{
		return shell_exec($cmd);
	}

	function formatValues($return,$results,$type,$map)
	{
		$bits = explode(" ",$results);
		foreach($bits as $k => $v)
		{
			if(!isset($map[$k]) || !$map[$k]) continue;
			$return[$type.'.'.$map[$k]] = trim($v);
		}

		return $return;
	}
}


$sar = array(
	'cpu' => array(
		'cmd' => 'LC_TIME="en_US.UTF-8" sar -u | tail -n 2 | head -n 1 | awk \'{$1=$1}{print}\'',
		'map' => array(false,false,'num','user','nice','system','iowait','steal','idle'),
	),
	'load' => array(
		'cmd' => 'cat /proc/loadavg',
		'map' => array('1min','5min','15min',false,false),
	),
	'mem' => array(
		'cmd' => 'LC_TIME="en_US.UTF-8" sar -r | tail -n 2 | head -n 1 | awk \'{$1=$1}{print}\'',
		'map' => array(false,false,'kbmemfree','kbmemused','memused','kbbuffers','kbcached','kbcommit','commit','kbactive','kbinact','kbdirty'),
	),
	'disk' => array(
		'cmd' => 'LC_TIME="en_US.UTF-8" sar -b | tail -n 2 | head -n 1 | awk \'{$1=$1}{print}\'',
		'map' => array(false,false,'tps','rtps','wtps','breads','bwrtns'),
	),
	'net' => array(
		'cmd' => 'LC_TIME="en_US.UTF-8" sar -n DEV | grep eth0 | tail -n 2 | head -n 1 | awk \'{$1=$1}{print}\'',
		'map' => array(false,false,'iface','rxpcks','txpcks','rxkbs','txkbs','rxcmps','txcmps','rxmcsts','ifutil'),
	),
);


$n = new SystemStats($sar);
echo $n->run();