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 <?php
 /**
  *  ocs-webserver
  *
  *  Copyright 2016 by pling GmbH.
  *
  *    This file is part of ocs-webserver.
  *
  *    This program is free software: you can redistribute it and/or modify
  *    it under the terms of the GNU Affero General Public License as
  *    published by the Free Software Foundation, either version 3 of the
  *    License, or (at your option) any later version.
  *
  *    This program is distributed in the hope that it will be useful,
  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *    GNU Affero General Public License for more details.
  *
  *    You should have received a copy of the GNU Affero General Public License
  *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  **/
 
 class Default_View_Helper_PrintDateSince extends Zend_View_Helper_Abstract
 {
 
     public function printDateSince($strTime, $fromFormat='Y-m-d H:i:s')
     {
         
         if (empty($strTime)) {
             return null;
         }
         if(strtotime($strTime) == strtotime('0000-00-00 00:00:00')){
           return '';
         }
 
         $date = DateTime::createFromFormat($fromFormat, $strTime);
         $now = new DateTime();
         $interval = $date->diff($now);
        
         $tokens = array(
             'y' => 'year',
             'm' => 'month',
             'd' => 'day',
             'h' => 'hour',
             'i' => 'minute',
             's' => 'second'
         );
         foreach ($tokens as $unit => $text) {
             if ($interval->$unit == 0) continue;            
            return $interval->$unit . ' ' . $text .(($interval->$unit > 1) ? 's' : ''). ' ago';           
         }
         return null;       
     }
 
 }