membuat login session php mysqli

?php session_start(); include "koneksi.php"; $username = $_POST["username"]; $p = md5($_POST["password"]); $sql = "select * from user where username='".$username."' and password='".$p."' limit 1"; $hasil = mysqli_query ($kon,$sql); $jumlah = mysqli_num_rows($hasil); if ($jumlah0) { $row = mysqli_fetch_assoc($hasil); $_SESSION["id_user"]=$row ... bisnis4d login