php session variable doesn't update on post - php

Question

I've had this problem for a couple days now and I've been trying different things to attempt to fix it and I'm not getting anywhere. Basically I'm pulling in data from a database, displaying the data using a loop, adding a "delete" button, and storing the data in a session array.
When the user presses the delete button the page refreshes but my session variable isn't being updated. Can anyone tell me why? I'm using the if isset 'POST' to update my session variable. FYI there's a lot of extra echoes in my code just so I can see what's going on. Any suggestions would be greatly appreciated. I also threw in a JavaScript popup to see if the if statement was working. The popup is not coming up either.
<?php
function multilineQ($con, $sql)
{
$x = 0; // incremented for the ex number
if (mysqli_multi_query($con,$sql))
{
do
{
// Store first result set
if ($result=mysqli_store_result($con))
{
while ($row=mysqli_fetch_assoc($result))
{
$button = "ex" . $x . "Button";
echo "<ex id=\"ex$x\">";
echo $row['ExType'] . ' ----- ' . $row['ExName'] . " " .
"<input type=\"submit\"
name=\"$button\"
value=\"Delete\"> " .
" - <b>Button Name: </b>" . $button;
echo "<br />";
echo "</ex>";
// Add to Array
// ----------------------
$_SESSION['exArray'][$x][0] = 1;
$_SESSION['exArray'][$x][1] = $row['ExType'];
$_SESSION['exArray'][$x][2] = $row['ExName'];
// ----------------------
// If delete button pressed...
// ----------------------
echo "$button If statement created <br /><br />";
if (isset($_POST['$button']))
{
$_SESSION['exArray'][$x][0] = 0;
$foo = "Alert: " . $_SESSION['exArray'][$x][3] . " : Deleted.";
echo "<script type='text/javascript'>alert('$foo')</script>";
}
// ----------------------
$x++; // Increment number
}
mysqli_free_result($con);
}
} while (mysqli_next_result($con));
} else
{
echo 'Could not run SQL...';
}
}
?>

Answer 1

you need add the session_start() on the first statement.
<?php
here> session_start();
function multilineQ($con, $sql)
{