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<?php
/* Gets individual core information */
function GetCoreInformation() {
	$data = file('/proc/stat');
	$cores = array();
	foreach( $data as $line ) {
		if( preg_match('/^cpu[0-9]/', $line) )
		{
			$info = explode(' ', $line );
			$cores[] = array(
				'user' => $info[1],
				'nice' => $info[2],
				'sys' => $info[3],
				'idle' => $info[4]
			);
		}
	}
	return $cores;
}
/* compares two information snapshots and returns the cpu percentage */
function GetCpuPercentages($stat1, $stat2) {
	if( count($stat1) !== count($stat2) ) {
		return;
	}
	$cpus = array();
	for( $i = 0, $l = count($stat1); $i < $l; $i++) {
		$dif = array();
		$dif['user'] = $stat2[$i]['user'] - $stat1[$i]['user'];
		$dif['nice'] = $stat2[$i]['nice'] - $stat1[$i]['nice'];
		$dif['sys'] = $stat2[$i]['sys'] - $stat1[$i]['sys'];
		$dif['idle'] = $stat2[$i]['idle'] - $stat1[$i]['idle'];
		$total = array_sum($dif);
		$cpu = array();
		foreach($dif as $x=>$y) $cpu[$x] = round($y / $total * 100, 1);
		$cpus['cpu' . $i] = $cpu;
	}
	return $cpus;
}


/* get core information (snapshot) */
$stat1 = GetCoreInformation();
/* sleep on server for one second */
sleep(1);
/* take second snapshot */
$stat2 = GetCoreInformation();
/* get the cpu percentage based off two snapshots */
$data = GetCpuPercentages($stat1, $stat2);



/* makes a google image chart url */
function makeImageUrl($title, $data) {
	$url = 'http://chart.apis.google.com/chart?chs=440x240&cht=pc&chco=0062FF|498049|F2CAEC|D7D784&chd=t:';
	$url .= $data['user'] . ',';
	$url .= $data['nice'] . ',';
	$url .= $data['sys'] . ',';
	$url .= $data['idle'];
	$url .= '&chdl=User|Nice|Sys|Idle&chdlp=b&chl=';
	$url .= $data['user'] . '%25|';
	$url .= $data['nice'] . '%25|';
	$url .= $data['sys'] . '%25|';
	$url .= $data['idle'] . '%25';
	$url .= '&chtt=Core+' . $title;
	return $url;
}
/* ouput pretty images */
foreach( $data as $k => $v ) {
	echo '<img src="' . makeImageUrl( $k, $v ) . '" />';
}
?>