Sort from database tables by multiple checkbox php - php

Question

I have a question about display data from the database alphabetically.
I have 2 ckeckboxes and if the nr.1 is checked, it must display data alphabetically from table "companyName" but if chechbox nr.2 is checked, it must display data alphabetically from table "stade".
I am very new to coding, so I will be happy if there was someone who could explain or show me exactly how it should look.
Here is the checkboxes:
<fieldset>
<dl">
<dt><label for="sleep">Sortering:</label></dt>
<dd>
<input type="checkbox" name="" value="Alfabetisk A-Z"/>
<label for="alfabetiskA-z" class="opt">Alfabetisk A-Z</label>
<input type="checkbox" name="" value="Alfabetisk Stade"/>
<label for="alfabetiskStade" class="opt">Alfabetisk Stade</label>
</dd>
</dl>
</fieldset>
Here is where I show my data fra the database:
echo '
<table class="tableUser">
<tr class="topColor">
<td>Stade</td>
<td>Firmanavn</td>
<td>Navn</td>
<td>Telefon nr.</td>
<td>E-mail adresse</td>
</tr>';
$class0 = "trColor0";
$class1 = "trColor1";
$query = mysqli_query($conn,"SELECT * FROM creatUser ORDER BY companyName ASC");
while( $result = mysqli_fetch_array($query)) {
$id = $result['id'];
$class = "trColor". $i%2;
echo '
<tr class="'.$class.'">
<td VALIGN=TOP>'.$result['locationNumber'].'</td>
<td VALIGN=TOP>'.$result['companyName'].'</td>
<td VALIGN=TOP>'.$result['fName'] . ' ' . $result['lName'].'</td>
<td VALIGN=TOP>'.$result['phone'].'</td>
<td VALIGN=TOP>'.$result['eMail'].'</td>
</tr>';
$i++;
}

Answer 1

You have to give names to your checkboxes, so you can get what the user selected:
<input type="checkbox" name="sort" value="Alfabetisk A-Z"/>
<label for="alfabetiskA-z" class="opt">Alfabetisk A-Z</label>
<input type="checkbox" name="sort" value="Alfabetisk Stade"/>
<label for="alfabetiskStade" class="opt">Alfabetisk Stade</label>
Then in your PHP, you do:
if (!isset($_POST['sort']) || $_POST['sort'] == 'Alfabetisk A-Z') {
$order = 'companyName'
} else {
$order = 'stade';
}
$sql = "SELECT * FROM creatUser ORDER BY $order ASC";
$query = mysqli_query($conn, $sql) or die (mysqli_error($conn));