获取一小时前的日期和时间

<?php
  $time = strtotime('2010-12-09 0:10');
  print_r(getPreTime($time));
  /**
  * @desc 获取一小时前的日期和时间
  * @param int $time timestamp
  * @return array  
  */
  function getPreTime($time){     
      $time_pre = strtotime('-1 hour',$time);
      $aRes['date'] =  date("Y-m-d",$time_pre);
      $aRes['hour'] =  date("G",$time_pre);
     
      return $aRes;
  }
 
?>