从SQL表中获取单数值

Question

I am trying to fetch a value from one of my tables, however it doesn't appear to be retrieving it as when I echo the variable nothing is displayed.

Here is my code

<?php
$conn = new mysqli('localhost','root','root','neadatabase'); //Creating 
connection to database



//Connection Error Checking
if ($conn->connect_error) 
{
    die("Connection Failed: " . $conn->connect_error);
}

echo ("Connection Successful");

//selecting bookings
$sqlSelectBookings = "
    SELECT ActivID, DateRequired, TimeRequired
    FROM activbooking
    WHERE ActivID = '$_POST[ActivID]' AND DateRequired = 
   '$_POST[DateRequired]' AND '$_POST[DateRequired]' AND 'TimeRequired = ' 
   $_POST[TimeRequired]'
";

$sqlSelectBookings = $conn->que($sqlSelectBookings);

//getting member limit
$sqlGetMemberLimit = "
    SELECT memberLimit
    FROM activity
    WHERE activID = '$_POST[ActivID]'
";

$sqlGetMemberLimit = ($conn->query($sqlGetMemberLimit)-
>fetchObject(memberLimit));

echo $sqlGetMemberLimit;

Any ideas?

This is what happens when I run the page

Thanks