[I want to check if the User has typed it in correctly controlling on the Database.]

I want to check if the User has typed it in correctly controlling on the Database.

(The echos are just there for debug reasons)

if (isset($_POST['aktion']) and $_POST['aktion']=='Annehmen') {    //button click
echo '<p>1</p>';
    $email = "";
    if (isset($_POST['email'])) {    //steht was da?
        $email = (INT) trim($_POST['email']);
    echo '<p>2</p>';
    if ($email != '') {    //steht was da? 2.0
        $suche = $db->prepare("SELECT email FROM recipients WHERE email = ?");
        $suche->bind_param('s', $email);
        $emailtest = "";
        $suche->execute();
        $suche->bind_result($emailtest);
        echo '<p>3</p>';
        if ($email == $emailtest){
            echo '<p>4</p>';
        }
    }
    }
}

The debug reaches "Milestone" 3, then its trace disappears, doesn't matter whether it's the right or wrong email.

THX for help in advance :).