insert.php

<?php

include('konek.php');

$user = $_POST['user'];
$pswd = $_POST['pswd'];

if(strlen($user) < 5 || strlen($pswd) < 5)
 echo 'User / Password Harus lebih dari 5 Karakter';
else{
 $search = mysqli_query($koneksi, 'Select * From user where user="'.$user.'"');

 if(mysqli_num_rows($search) > 0)
 echo 'Nama User Sudah Ada';
 else{
 $insert = mysqli_query($koneksi, 'Insert Into user (user, password) values ("'.$user.'", "'.$pswd.'")');

 if(mysqli_num_rows($insert) == 0)
 echo 'Gagal Menambah Data';

 header('location:index.php');
 }
}