php变量与JS变量实现不通过跳转直接交互的方法

<?php $aaa = '111';?>
var aaa = <?php echo $aaa;?>;

$c = "<script>document.write(leaderTask_info['end_time']);</script>";
echo formatTime($c);//leaderTask_info['end_time']是js变量
/**
* 将截止时间秒数转换为日期制
*/
function formatTime($date){
  $t = $date - time();
  $f = array(
    '31536000'=>'年',
    '2592000'=>'个月',
    '604800'=>'星期',
    '86400'=>'天',
    '3600'=>'小时',
    '60'=>'分钟',
    '1'=>'秒'
  );
  foreach($f as $k=>$v){
    $c = floor($t/(int)$k);
    if($c > 0){
      if(0 != $c){
        return "剩余".$c.$v;
      }
    }
  }
  return "已截止";
}