php human friendly time diff

time_diff.php

<?php
function pdate($s,$t==''){
  $r = $n = '';
	$na = array('1'=>'sec','2'=>'min','3'=>'hour','4'=>'day','5'=>'week','6'=>'month','7'=>'year');
	$p = time()-$s;
	if($p<60){
		$n = 1;
		$r = ceil($p/1-0.45);
	}
	elseif($p<3600){
		$n = 2;
		$r = ceil($p/60-0.45);
	}
	elseif($p<86400){
		$n = 3;
		$r = ceil($p/3600-0.45);
	}
	elseif($p<604800){
		$n = 4;
		$r = ceil($p/86400-0.45);
	}
	elseif($p<2592000){
		$n = 5;
		$r = ceil($p/604800-0.45);
	}
	elseif($p<31536000){
		$n = 6;
		$r = ceil($p/2592000-0.45);
	}
	else{
		$n = 7;
		$r = ceil((date('Y')*12-date('Y',$s)*12+date('m')-date('m',$s))/12-0.45);
	}
	if($r<1) $r = 1;
	if($r>1) $r = $r.' '.$na[$n].'s ago';
	else $r = $r.' '.$na[$n].' ago';
	if($t=='html') $r = ' <span class="time" itemprop="datePublished" content="'.date('c',$s).'" title="'.date('c',$s).'">'.$r.'</span>';
	else $r = ' <span class="time" title="'.date('c',$s).'">'.$r.'</span>';
	return $r;
}
echo pdate(date()-3526);
echo pdate(date-12345, 'html');
?>