The PHP sort table when the Send button is clicked

I want to be able to sort my table as ASC in a field when the submit button is clicked.

I have used an array function to get the information from a SQL database, I have tried making a sort function but when I click 'submit' nothing happens.

This is my attempt of creating the submit button:

 <h1> Courses </h1>
<form name="Table Properties" method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>">
Order by Week
<button type="submit" name="week" class="button" <?php echo $value='1'; ?>"> Sort Week </button>
</form>
<?php
if(isset($_POST['week'])){
        $query="SELECT * FROM `classes` ORDER BY `classes`.`week` ASC";
   }

When I click submit the table remains the same.

Here is my table connect information

$con = mysql_connect("host", "username", "password");
if (!$con)
{
    die('Could not connect: ' . mysql_error());
}
mysql_select_db("username", $con);
$sql = "SELECT * FROM `classes`";
$myData = mysql_query($sql, $con);
echo "<table border=1>
<tr>
<th> Name 1 </th>
<th> Name 2 </th>
<th> Name 3 </th>
<th> Name 4 </th>
</tr>";
while ($record = mysql_fetch_array($myData)){
    echo "<tr>";
    echo"<td>" . $record['name 1'] . "</td>";
    echo"<td>" . $record['week'] . "</td>";
    echo"<td>" . $record['name 3'] . "</td>";
    echo"<td>" . $record['name 4'] . "</td>";
    echo "</tr>";
}
echo "</table>";
mysql_close($con);
}
?>

I asked a similar question in the past but I think they misunderstood due to lack of full information.

---

try this code

$con = mysql_connect("host", "username", "password");
if (!$con)
{
    die('Could not connect: ' . mysql_error());
}
mysql_select_db("username", $con);
$sql = "SELECT * FROM `classes`";

if(isset($_POST['week'])){
        $sql="SELECT * FROM `classes` ORDER BY `classes`.`week` ASC";
   }

$myData = mysql_query($sql, $con);
echo "<table border=1>
<tr>
<th> Name 1 </th>
<th> Name 2 </th>
<th> Name 3 </th>
<th> Name 4 </th>
</tr>";
while ($record = mysql_fetch_array($myData)){
    echo "<tr>";
    echo"<td>" . $record['name 1'] . "</td>";
    echo"<td>" . $record['week'] . "</td>";
    echo"<td>" . $record['name 3'] . "</td>";
    echo"<td>" . $record['name 4'] . "</td>";
    echo "</tr>";
}
echo "</table>";
mysql_close($con);
}
?>