<?php
include("db.php");
session_start();
if(isSet($_POST['username_log']) && isSet($_POST['password_log']))
{
// username and password sent from Form

$nick=(mysqli_real_escape_string($conn,$_POST['username_log']));
$username=sha1(mysqli_real_escape_string($conn,$_POST['username_log']));
$password=sha1(mysqli_real_escape_string($conn,$_POST['password_log']));

$result=mysqli_query($conn,"SELECT * FROM login_user WHERE username='$username' and password='$password'");
$count=mysqli_num_rows($result);

$row=mysqli_fetch_array($result,MYSQLI_ASSOC);
// If result matched $myusername and $mypassword, table row must be 1 row
if($count==1)
{
$_SESSION['login_user']=$row['username'];
echo $row['username'];
$_SESSION['nick_user']=$row['nick'];
echo $row['username'];

}

}

?>