Source Code Timestamp

<?
class DateHelper{
public static function get_time_ago($time_stamp)
{
$time_difference = strtotime('now') - $time_stamp;

if($time_difference >= 60 * 60 * 24 * 365.242199)
{
return DateHelper::get_time_ago_string($time_stamp, 60 * 60 * 24 * 365.242199, 'tahun');
}
elseif ($time_difference >= 60 * 60 * 24 * 30.4368499)
{
return DateHelper::get_time_ago_string($time_stamp, 60 * 60 * 24 * 30.4368499, 'bulan');
 }
elseif ($time_difference >= 60 * 60 * 24 * 7)
{
return DateHelper::get_time_ago_string($time_stamp, 60 * 60 * 24 * 7, 'minggu');
}
elseif ($time_difference >= 60 * 60 * 24)
{
return DateHelper::get_time_ago_string($time_stamp, 60 * 60 * 24, 'hari');
}
elseif ($time_difference >= 60 * 60)
{
return DateHelper::get_time_ago_string($time_stamp, 60 * 60, 'jam');
}else{
return DateHelper::get_time_ago_string($time_stamp, 60, 'menit');
}
}
public static function get_time_ago_string($time_stamp, $divisor, $time_unit){
$time_difference = strtotime("now") - $time_stamp;
$time_units      = floor($time_difference / $divisor);
settype($time_units, 'string');
if ($time_units === '0'){
return 'less than 1 ' . $time_unit . ' lalu';
}
elseif ($time_units === '1')
{
return '1 ' . $time_unit . ' lalu';
}else{
return $time_units . ' ' . $time_unit . ' yang lalu';
}
}
}

error_reporting(0);
session_start(); 
echo "".DateHelper::get_time_ago('1142006887')."";
// echo strtotime("now");
?>