if(!$prepared_statements['GetAdmUsers'] = $conn->prepare('SELECT nome FROM Alunos WHERE professor = ?'))
echo "<br/>Erro: " . $conn->error;

if(!$p['GetAdmUsers']->bind_param('i', $id))
                echo "<br/>Erro: ". $c->error;
            if(!$p['GetAdmUsers']->execute())
                echo "<br/>Erro: ". $c->error;