Joey Nelson Blog Misunderstanding

function rel_time($seconds){
	if($seconds < 60){
		if($seconds < 0){ $seconds = 0; }
		switch($seconds){
			case 1:
				return "1 second";
				break;
			default:
				return "$seconds seconds";
				break;
		}
	}else{
		$date_push = array();
		$time_units = array(	'year'		=> (365*24*60*60),
					'month'		=> (30*24*60*60),
					'week'		=> (7*24*60*60),
					'day'		=> (24*60*60),
					'hour'		=> (60*60),
					'minute'	=> (60));
		foreach($time_units as $unit=>$unit_time){
			$total = 0;
			if($unit=='day' && count($date_push) && ($seconds < $time_units['day'])){
				$seconds = 0;
			}
			while($seconds >= $unit_time){
				$seconds -= $unit_time;
				$total++;
			}
			switch ($total){
				case 0:
					break;
				case 1:
					$date_push[] = "1 $unit";
					break;
				default:
					$date_push[] = "$total {$unit}s";
					break;
			}
			if(count($date_push) == 2){
				break;
			}
		}
		return implode(" and ", $date_push);
	}
}

$rel_time  = rel_time(time() - $timestamp);
print "Posted $rel_time ago";