Today i have run into some problems with mysql, php and html.
So i have a database called "gebruikers" in that database i have a table called "registratie" and i use USBwebserver V8.6 for the hosting
i have made a form for people to register them for the website i am planning to make, but what i'm bumping into is that when i press "inschrijven" it won't insert the data typed in the form into my database i have looked on stackoverflow but i couldn't find the solving answer to my problem.
PHP:
    <?php
session_start();
include_once 'dbconnect.php';
$gebruikersnaam = mysql_real_escape_string($post['gebruikersnaam']);
$wachtwoord = mysql_real_escape_string($post['wachtwoord']);
$voornaam = mysql_real_escape_string($post['voornaam']);
$tussenvoegsel = mysql_real_escape_string($post['tussenvoegsel']);
$achternaam = mysql_real_escape_string($post['achternaam']);
$klas = mysql_real_escape_string($post['klas']);
$telefoon = mysql_real_escape_string($spot['telefoon']);
$geboortedatum = mysql_real_escape_string($post['geboortedatum']);
$email = mysql_real_escape_string($post['email']);
$geslacht = mysql_real_escape_string($post['geslacht']);
if(mysql_query("INSERT INTO gebruikers(gebruikersnaam,) VALUES('$gebruikersnaam')"
?>
HTML:
<body>
    <div id=titel>
        <a href=index.html><img src="images/logo.jpg" alt="Homepage"id=logo></a>
    Registratie
    </div>
    <div id=registratie>
        form  method="post">
        Gebruikersnaam:
        <input type="text" name="gebruikersnaam">
        <br>
        <br>
        Wachtwoord:
        <input type="password" name="wachtwoord">
        <br>
        <br>
        Voornaam:
        <input type="text" name="voornaam">
        <br>
        <br>
        Tussenvoegsel:
        <input type="text"name="tussenvoegsel">
        <br>
        <br>
        Achternaam:
        <input type="text" name="achternaam">
        <br>
        <br>
        Klas:
        <input type="text" name="klas">
        <br>
        <br>
        Telefoon:
        <input type="tel" name="telefoon">
        <br>
        <br>
        Geboortedatum:
        <input type="date" name="geboortedatum">
        <br>
        <br>
        Email:
        <input type="email" name="email">
        <br>
        <br>
        Geslacht:
        <br>
        <select>
        <option value="Man">Man</option>
        <option value="Vrouw">Vrouw</option>
        </select>
        <br>
        <br>
        <input type="submit" onclick="alert('Registratie voltooid')" value="Inschrijven">
        </form>
        <a href=index.html id="button">Terug naar hoofdpagina</a>
        </div>
</body>
i really hope that this can help you guys out. this is my DBCONNECT.PHP:
    <?php
if(!mysql_connect("localhost", "root", "usbw", "gebruikers"))
{
    die('connection problem.' .mysql_error());
}
if(!mysql_select_db("gebruikers"))
{
    die('No database selected' .mysql_error());
}
include 
?>
i really hope you guys could help me out, because i'm out of ideas how i can fix this problem and i don't know where my problem lies.
NOTE: some words are in dutch.
 
     
     
     
    