Calculate time difference using PHP

 function get_time_difference_php($created_time)

 {

        date_default_timezone_set('Asia/Calcutta'); //Change as per your default time

        $str = strtotime($created_time);

        $today = strtotime(date('Y-m-d H:i:s'));

        

        // It returns the time difference in Seconds...

        $time_differnce = $today-$str;

        

        // To Calculate the time difference in Years...

        $years = 60*60*24*365;

        

        // To Calculate the time difference in Months...

        $months = 60*60*24*30;

        

        // To Calculate the time difference in Days...

        $days = 60*60*24;

        

        // To Calculate the time difference in Hours...

        $hours = 60*60;

        

        // To Calculate the time difference in Minutes...

        $minutes = 60;

        if(intval($time_differnce/$years) > 1)

        {

            return intval($time_differnce/$years)." years ago";

        }else if(intval($time_differnce/$years) > 0)

        {

            return intval($time_differnce/$years)." year ago";

        }else if(intval($time_differnce/$months) > 1)

        {

            return intval($time_differnce/$months)." months ago";

        }else if(intval(($time_differnce/$months)) > 0)

        {

            return intval(($time_differnce/$months))." month ago";

        }else if(intval(($time_differnce/$days)) > 1)

        {

            return intval(($time_differnce/$days))." days ago";

        }else if (intval(($time_differnce/$days)) > 0) 

        {

            return intval(($time_differnce/$days))." day ago";

        }else if (intval(($time_differnce/$hours)) > 1) 

        {

            return intval(($time_differnce/$hours))." hours ago";

        }else if (intval(($time_differnce/$hours)) > 0) 

        {

            return intval(($time_differnce/$hours))." hour ago";

        }else if (intval(($time_differnce/$minutes)) > 1) 

        {

            return intval(($time_differnce/$minutes))." minutes ago";

        }else if (intval(($time_differnce/$minutes)) > 0) 

        {

            return intval(($time_differnce/$minutes))." minute ago";

        }else if (intval(($time_differnce)) > 1) 

        {

            return intval(($time_differnce))." seconds ago";

        }else

        {

            return "few seconds ago";

        }

  }