stres

<?php
    include 'koneksi.php';
    $user=$_POST['user'];
    $email=$_POST['email'];
    $pass=$_POST['password'];
    $pass2=$_POST['password2'];
    // cek data
        if ($user&&$email&&$pass&&$pass2) {
            if (strlen($user)>10) {
                echo "Username maksimal 10 character";
            }else {
                if (strlen($pass)>16 || strlen($pass2)<6) {
                    echo "Password 6-16 character";
                }else {
                    if ($pass == $pass2) {
                        $cek=mysqli_query($conn,"SELECT * FROM out WHERE user='$user'");
                        $cek2=mysqli_num_rows($cek);
                        if ($cek == 0) {
                            $pass=md5($pass);
                            $pass=md5($pass2);
                            $isi=mysqli_query($conn ,"INSERT INTO out VALUES ('','$user','$email','$pass','$pass2')");
                            if ($isi) {
                                echo "BERHASIL";
                            }else {
                                echo "GAGAL";
                            }
                        }else {
                            echo "Username telah digunakan";
                        }
                    }else {
                        echo "Password tidak sama";
                    }
                }
            }
        }else {
            echo "Isi data dengan lengkap";
        }
?>