I can't update mysql database

Question

I built something for my office, PHP CODE

when I built it over my APACHE it worked fine, when I uploaded it to the server I'm getting the POD or MYSQLI errors, I fixed it (by using "error_reporting(E_ALL ^ E_DEPRECATED);" on the top, and it worked)

the only problem that I'm having now is that I can't update the database as I did on my APACHE, it just doesn't update. it give me the OK message but it doesn't update anything.

this is my code:

<?php
mysqli_connect('localhost','USERNAME','PASSWORD','TABLE');

if(isset($_POST["register"]))
{

$status=$_POST["status"];

mysqli_query("update login set status='$status' WHERE username='".$_SESSION['name_of_user']."'"); 

echo "<font face=tahoma size=3 color=red>Thank you, the office has been updated.</br></font>";

}
mysqli_close($con);
 ?>

 <form method="post" action=" ">
 <font face=tahoma size=3><b>
 <label >Update Status:</label>
</br>
 <select name="status">
 <option value="In a Meeting">In a Meeting</option>
 <option value="Waiting for a Meeting">Waiting for Meeting</option>
 <option value="In a Referral">In a Referral</option>
 <option value="Off Work">Off Work</option>

 </select>

 <button type="submit" class="btn btn-info" name="register" >Send</button>
</br>
</font>
</form>

Answer 1

Seems like you forgot to start the session in your page

<?php 
session_start();

and your mysqli_connect('localhost','USERNAME','PASSWORD','TABLE'); should be mysqli_connect('localhost','USERNAME','PASSWORD','your_database_name');

$con =mysqli_connect('localhost','USERNAME','PASSWORD','your_database_name');
 mysqli_query($con,"update login set status='$status' WHERE username='".$_SESSION['name_of_user']."'"); 

Answer 2

mysqli_query appears to be missing the $con variable which should be the first parameter. $con isn't being set anywhere and should come from mysqli_connect See the docs for connect and query

<?php
$con = mysqli_connect('localhost','USERNAME','PASSWORD','TABLE');

if(isset($_POST["register"]))
{

    $status=$_POST["status"];

    mysqli_query($con, "update login set status='$status' WHERE username='".$_SESSION['name_of_user']."'"); 

    echo "<font face=tahoma size=3 color=red>Thank you, the office has been updated.</br></font>";

}
mysqli_close($con);
 ?>

Answer 3

you forget to start the session

session_start()

you have to declare $con variable before use it

use this query

mysqli_query($con,"update login set status='".$status."' WHERE username='".$_SESSION['name_of_user']."'");