2 out of 3 values gets to next page, first doesnt - php

Question

as the title says, it sends 2 out of 3 values. Im fairly new at php, html coding and the uses of mysql servers so im not sure what the error is.
Btw my project is to make a "Rent a car" site.
First site should be choose car brand, customer and city (sry for swedish, some of the code is in english)
Site#1
https://gyazo.com/86bd55f87f75950013f2c5f3d7466848
code#1
<form action="carsite.php" method="GET">
<table>
<tr>
<th>1.Välj Model</th>
<td>
<p>
<select value="car">
<option disabled selected value="">Välj Model</option>
<?php foreach($res as $row){?>
<option value="<?php echo htmlspecialchars($row->);?>"><?php echo htmlspecialchars($row->make);?></option><?php
}
?>
</select>
</p>
</td>
</tr>
<tr>
<th>2.Välj Kund</th>
<td>
<p>
<select name="customer">
<option disabled selected value="">Välj Kund</option>
<?php foreach($res2 as $row2){?>
<option value="<?php echo htmlspecialchars($row2->id);?>"><?php echo htmlspecialchars($row2->lname);?> <?php echo htmlspecialchars($row2->fname);?></option><?php
}
?>
</select>
</p>
</td>
</tr>
<tr>
<th>3.Välj Stad</th>
<td>
<p>
<select name="city">
<option disabled selected value="">Välj Stad</option>
<?php foreach($res3 as $row3){?>
<option value="<?php echo htmlspecialchars($row3->id);?>"><?php echo htmlspecialchars($row3->city);?></option><?php
}
?>
</select>
</p>
</td>
</tr>
</table>
<input type="submit" value="Sök">
</form>
in my eyes theres nothing wrong. (it sends the id from the tables in mysql)
but at the next site im getting 2/3 values i sent from first page.
Site#2
Notice: Undefined index: car in F:\xamp\htdocs\Slutproject\carsite.php on line 7
12
(12 there is acctually id(customer id) 1 and id 2(city id))
So my problem is why does it send id 2 and 3 but not first one even though they were copy pasted from first id part (the codes of line).
I have tried sending it with GET so i could see the values uptop, still nothing about the car id.
//Mikael

Answer 1

Your first <select> tag has a typo. It should be <select name="car">.