User friendly time from the unix time stamp

function formatEventtime($eventtime) {

/* difference between current time and the event time
$eventtime in timestamp */
$timediff = time() - ((int) $eventtime);

if ($timediff < 60) {
$formattedtime='just now';
} else if ($timediff < 3600) {
$timediff = round($timediff / 60);
if ($timediff == 0)
$timediff = 1;
if ($timediff > 1)
$formattedtime=$timediff.' minutes left';
$formattedtime='a minute left';
} else if ($timediff < 86400) {
$timediff = round($timediff / 3600);
if ($timediff == 0) $timediff = 1;
if ($timediff > 1)
$formattedtime=$timediff. 'hours left';
$formattedtime='one hour left';


} else {
$timediff = round($timediff / 86400);
if ($timediff == 0) $timediff = 1;
if ($timediff > 1)
$formattedtime=$timediff. ' days left'
$formattedtime='yesterday';
}


return $formattedtime ;

}