issue Updating table - php

Question

I have an app that I am trying to use to update a mysql table which has the following layout:
I am trying to get it so that the app sends in the URL the employee name and the in/out column value, and then my PHP script finds the person with the matching name and changes the in/out column value. Here is an example of an entry:
For some reason, when the in/out column should be changing to a 1, it remains at 0.
My Script is as follows:
<?php
// Input the credentials, clocktablet would be the database name
$con=mysqli_connect("localhost","tablet1","*****","clocktablet");
// Check connection
if (mysqli_connect_errno()) {
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
// escape variables for security
$employeename = mysqli_real_escape_string($con, $_GET['employeename']);
$Clock = mysqli_real_escape_string($con, $_GET['Clock']);
//alters Track Table to display in/out status
$sql = "UPDATE track SET In/Out=$Clock WHERE EmployeeName=$employeename";
if (!mysqli_query($con,$sql)) {
die('Error: ' . mysqli_error($con));
}
mysqli_close($con);
?>
Can anyone see anything wrong with the php script?
The table name is Track and the DB name is clocktablet, and I can confirm that the username and password inputted into the script is correct.

Answer 1

Missing quotes in column values and backtick in column name for exm In/Out .
Better use prepare statement!!
//alters Track Table to display in/out status
$smt = $con->prepare("UPDATE `track` SET `In/Out`=? WHERE `EmployeeName`=?");
$smt->bind_param('is',$_GET['Clock'],$_GET['employeename']);
$smt->execute();
To check number of affected rows by update query use
printf("Affected rows (UPDATE): %d\n", $con->affected_rows);

Answer 2

Change
$sql = "UPDATE track SET In/Out=$Clock WHERE EmployeeName=$employeename";
To
$sql = "UPDATE track SET `In/Out`=$Clock WHERE EmployeeName='$employeename'";
^ enclose column name with backtick
May be column name with backslash are allowed while creating a table. But, while inserting value for that column. It need to be enclosed with backtick, otherwise, it will through an error stating
1064 - You have an error in your SQL syntax; check the manual that
corresponds to your MySQL server version for the right syntax to use
near 'in/out
Backtick

Answer 3

Use single quotes around $employeename and backtick in column name for In/Out
$sql = "UPDATE track SET `In/Out`= $Clock WHERE EmployeeName= '$employeename'";