funtion to return current age

[bcamp1973]

I was all proud of myself for getting this far with this function and then realized it's not returning the right values.  It's purpose is to return the current age of an item based on it's date of creation. Can someone point me in the right direction?

 

function age($startDate,$endDate=NULL){

$text='';

$seconds=strtotime($endDate!='0000-00-00 00:00:00' ? $endDate : gmdate('Y-m-d H:i:s'))-strtotime($startDate);
$periods=array('yr'=>31570560,'mon'=>2630880,'day'=>86400,'hr'=>3600,'min'=>60);

foreach($periods AS $k=>$v){
	if(($temp=$seconds/$v)>=1){
		$text.=floor($temp).' '.$k.($temp>=2 ? 's': '').' ';
		$seconds=$seconds % $v;
	}
}

return $text;
}