minutes to text

<?php
	/**
	 * Convert minutes into a human-readable format.
	 * i.e. 60 minutes = 1 hour, 10080 minutes = 1 week
	 *
	 * Examples:
	 * 1530 minutes is 1 day, 1 hour, 30 minutes
	 * minutesToText(1530, array('rounded'=>0)) = 1 day
	 * minutesToText(1530, array('rounded'=>1)) = 1.1 days
	 * minutesToText(1530, array('units'=>1)) = 1 day
	 * minutesToText(1530, array('units'=>2)) = 1 day, 1 hour
	 * minutesToText(1530, array('units'=>3)) = 1 day, 1 hour, 30 minutes
	 * 
	 * @param int $minutes
	 * @param int [0] $round If > 0, only one unit is returned, rounded to this many places
	 * @param int [1] $numUnits The number of different units to return
	 * @param boolean [FALSE] $abbr If TRUE, uses 'min' instead of 'minutes
	 * @return string
	 */
	static public function minutesToText($input, $opts=array())
	{
		$round = 0;
		$numUnits = 1;
		$abbr = FALSE;
		extract($opts);

		if($abbr)				
			$units = array(
				525600 => 'yr',
				40320 => 'mth',
				10080 => 'wk',
				1440 => 'day',
				60 => 'hr',
				1 => 'min',
			);
		else
			$units = array(
				525600 => 'year',
				40320 => 'month',
				10080 => 'week',
				1440 => 'day',
				60 => 'hour',
				1 => 'minute',
			);
		
		$diff = $input;
		foreach($units as $m=>$label)
		{
			$$label = floor($diff / $m);
			if($round > 0 && $$label > 0)
				return ($r = round($input / $m, $round)) > 1 
					? $r . ' ' . $label . 's'
					: $r . ' ' . $label;

			$diff -= $$label * $m;
		}

		$labels = array_values($units);

		$r = array();
		for($i = 0; $i < count($units) && count($r) < $numUnits; $i++)
			if(${$labels[$i]} > 0)
				$r[] = ${$labels[$i]} . ' ' . $labels[$i] . (${$labels[$i]} > 1 ? 's' : '');
		
		return implode(', ', $r);
	}
?>