Op submit duwen doet niks

<?php
include ('../config.php');
echo '<table border="0"><tr><td>';

if ($_SERVER['REQUEST_METHOD'] != "POST"){
    
    echo '<form method="POST" action="#">';
    echo 'Email: <input type="text" name="email"><br>';
    echo 'Paswoord: <input type="text" name="paswoord"><br>';
    echo '<input type="submit" value="Inloggen"><br>';
    echo '</form>';
}
  
else {
    
    if (empty($_POST['email'])){
      echo 'U hebt uw emailadres niet correct ingevult!';
    }
    elseif (empty($_POST['paswoord'])){
      echo 'U hebt uw paswoord niet correct ingevult!';
    }
    else {
      
        $email= $_POST['email'];
        $paswoord= $_POST['paswoord'];
    
        $select = "SELECT * FROM klanten WHERE klant_email= '" .$email. "' AND klant_paswoord= '" .$paswoord. "'";
        $query = mysql_query($select);
    
            if(mysql_num_rows($select == 0)){
                echo 'Sorry deze combinatie klopt niet!';
            }
    
            else {
                     echo 'U bent succesvol ingelogt.';
            }
    }
}

echo '</td></tr></table>';
?>