viewutils.php
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	<?php

	function phutil_date_format($epoch) {
	$now = time();
	$shift = 30 * 24 * 60 * 60;
	if ($epoch < $now + $shift && $epoch > $now - $shift) {
	$format = pht('D, M j');
	} else {
	$format = pht('M j Y');
	}
	return $format;
	}

	function phutil_format_relative_time($duration) {
	return phutil_format_units_generic(
	$duration,
	array(60, 60, 24, 7),
	array('s', 'm', 'h', 'd', 'w'),
	$precision = 0);
	}

	/**
	* Format a relative time (duration) into weeks, days, hours, minutes,
	* seconds, but unlike phabricator_format_relative_time, does so for more than
	* just the largest unit.
	*
	* @param int $duration Duration in seconds.
	* @param int $levels (optional) Levels to render. By default, renders the
	* three highest levels, ie: 5 h, 37 m, 1 s
	* @return string Human-readable description.
	*/
	function phutil_format_relative_time_detailed($duration, $levels = 2) {
	if ($duration == 0) {
	return 'now';
	}
	$levels = max(1, min($levels, 5));
	$remainder = 0;

	$is_negative = false;
	if ($duration < 0) {
	$is_negative = true;
	$duration = abs($duration);
	}

	$this_level = 1;
	$detailed_relative_time = phutil_format_units_generic(
	$duration,
	array(60, 60, 24, 7),
	array('s', 'm', 'h', 'd', 'w'),
	$precision = 0,
	$remainder);
	$duration = $remainder;

	while ($remainder > 0 && $this_level < $levels) {
	$detailed_relative_time .= ', '.phutil_format_units_generic(
	$duration,
	array(60, 60, 24, 7),
	array('s', 'm', 'h', 'd', 'w'),
	$precision = 0,
	$remainder);
	$duration = $remainder;
	$this_level++;
	}

	if ($is_negative) {
	$detailed_relative_time .= ' ago';
	}

	return $detailed_relative_time;
	}

	/**
	* Format a byte count for human consumption, e.g. "10MB" instead of
	* "10485760".
	*
	* @param int $bytes Number of bytes.
	* @return string Human-readable description.
	*/
	function phutil_format_bytes($bytes) {
	return phutil_format_units_generic(
	$bytes,
	array(1024, 1024, 1024, 1024, 1024),
	array('B', 'KB', 'MB', 'GB', 'TB', 'PB'),
	$precision = 0);
	}


	/**
	* Parse a human-readable byte description (like "6MB") into an integer.
	*
	* @param string $input Human-readable description.
	* @return int Number of represented bytes.
	*/
	function phutil_parse_bytes($input) {
	$bytes = trim($input);
	if (!strlen($bytes)) {
	return null;
	}

	// NOTE: Assumes US-centric numeral notation.
	$bytes = preg_replace('/[ ,]/', '', $bytes);

	$matches = null;
	if (!preg_match('/^(?:\d+(?:[.]\d+)?)([kmgtp]?)b?$/i', $bytes, $matches)) {
	throw new Exception(pht("Unable to parse byte size '%s'!", $input));
	}

	$scale = array(
	'k' => 1024,
	'm' => 1024 * 1024,
	'g' => 1024 * 1024 * 1024,
	't' => 1024 * 1024 * 1024 * 1024,
	'p' => 1024 * 1024 * 1024 * 1024 * 1024,
	);

	$bytes = (float)$bytes;
	if ($matches[1]) {
	$bytes *= $scale[strtolower($matches[1])];
	}

	return (int)$bytes;
	}


	function phutil_format_units_generic(
	$n,
	array $scales,
	array $labels,
	$precision = 0,
	&$remainder = null) {

	$is_negative = false;
	if ($n < 0) {
	$is_negative = true;
	$n = abs($n);
	}

	$remainder = 0;
	$accum = 1;

	$scale = array_shift($scales);
	$label = array_shift($labels);
	while ($n >= $scale && count($labels)) {
	$remainder += ((int)$n % $scale) * $accum;
	$n /= $scale;
	$accum *= $scale;
	$label = array_shift($labels);
	if (!count($scales)) {
	break;
	}
	$scale = array_shift($scales);
	}

	if ($is_negative) {
	$n = -$n;
	$remainder = -$remainder;
	}

	if ($precision) {
	$num_string = number_format($n, $precision);
	} else {
	$num_string = (int)floor($n);
	}

	if ($label) {
	$num_string .= ' '.$label;
	}

	return $num_string;
	}

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