Print disk usage on PHP. for motd.

disk_usage.php

<?php

$result = shell_exec('df -k');
$disks = explode("\n", $result);
array_shift($disks);

function readable_byte($byte) {
	$units = array('KB', 'MB', 'GB', 'TB');
	for ($i = 0; $i < 3; $i++) {
		if ($byte < 1000) break;
		$byte /= 1000;
	}
	return (floor($byte * 10) / 10) . $units[$i];
}

$table = array();
$color = array('1;37', '1;34', '1;32', '1;31', '1;33');

foreach ($disks as $disk) {
	$segments = preg_split('#\s+#', $disk);
	if (count($segments) != 6 || $segments[0] === 'none' || !preg_match('#^/dev#', $segments[0])) continue;

	$percent = intval($segments[2]) / intval($segments[1]);

	$row = array();
	$row[] = $segments[0] . ' (' . $segments[5] . ')';
	$row[] = floor($percent * 100) . '%';
	$row[] = 'Free: ' . readable_byte($segments[3]);
	$row[] = 'Used: ' . readable_byte($segments[2]);
	$row[] = 'Total: ' . readable_byte($segments[1]);

	$table[] = $row;
}

$col_width = array();
foreach ($table as $row) {
	foreach ($row as $i => $col) {
		if (!isset($col_width[$i])) $col_width[$i] = 0;
		$col_width[$i] = max(strlen($col), $col_width[$i]);
	}
}

foreach ($table as $row) {
	foreach ($row as $i => $col) {
		if ($color[$i]) echo "\033[" . $color[$i] . 'm';
		echo $col . str_repeat(' ', $col_width[$i] - strlen($col)) . '  ';
		if ($color[$i]) echo "\033[0m";
	}
	echo "\n";
}