检查jquery中的if-else条件

我有jquery，它将测验的剩余时间打印到我的页面上。它运行良好。现在我想把条件if else放到timer_check.php的输出中。我已经设置了条件，如果剩余时间=0，则回显超时，否则打印剩余时间。我的jquery在quiz.php页面中。我想检查来自timer_check.php的输出是否超时，那么所有答案都应该提交到tableHolderdiv中的数据库else打印剩余时间。所以我的问题是，如何将来自timer_check.php的输出的if else条件设置为quiz.php，以检查提交测试还是打印剩余时间？

$(document).ready(function() {
  refreshTable();
});
function refreshTable(){
    $('#tableHolder').load('timer_check.php', function(){
       setTimeout(refreshTable, 1000);
    });
}

timer_check.php

session_start();
include("database.php");
$sql = "select * from ctip_test where test_id = '$_SESSION[testid]'";
$result = mysql_query($sql);
while ($row = mysql_fetch_array($result)) {
    $starttime = $row['attemp_time'];
}
$datetime1 = new DateTime($starttime);
$datetime1->add(new DateInterval('P0Y0M0DT2H0M0S'));
$currenttime =date('Y-m-d H:i:s');
$datetime2 = new DateTime($currenttime);
$diff = $datetime2->diff($datetime1);
$check_timeout = (array) $datetime2->diff($datetime1);
$hour = $check_timeout['h'];
$minute = $check_timeout['i'];
$second = $check_timeout['s'];
if($hour=="0" && $minute =="0" && $second =="0"){
    echo "time out";
}
else{
  echo($diff->format("%h hours %i minutes and %s seconds are remaining'n"));
}