saya debug semua

<?php
error_reporting( E_ALL );
if(!is_file('configurasi.php')){ die ('tidak ada konfigurasi'); }
require_once('configurasi.php');

if(!isset($_SESSION['userid'])){ die(' tidak ada session '); }
$user = $_SESSION['userid'];
if($_POST){
$nama = $_POST['nama'];
$mail = $_POST['email'];
$pass = $_POST['pwlama'];
$pass1 = $_POST['pwbaru'];
$pass2 = $_POST['pwconfirm'];
$query = mysql_query("SELECT * FROM db WHERE username = '$user'") or die( mysql_error()."<br>select username");
$hasil = mysql_fetch_array($query);
    if ( !$nama || !$mail || !$pass ) {
        echo"svsdvsdvsd";
    } else {
        if($pass !==  $hasil['password']){
            echo"dsb fdn";
        } else {
            if($pass1 == $pass2){
                if(empty($pass1)){
                    $pass1 = $pass;
                }
                $user = $_SESSION['userid'];
                $sql="UPDATE `db` SET `nama`='$nama',`email`='$mail',`password`='$pass1' WHERE username = '$user'";
                $simpan = mysql_query($sql) or die( mysql_error()."<br>$sql");
            } else {
                echo"ebebefve";
            }
        }
        if ($simpan) {
            echo"gwdvw";
        } else{
            echo"a";
    }
}else{
    echo 'tidak ada post';
}
        $query = mysql_query("SELECT * FROM db WHERE username = '$user'") or die( mysql_error()."<br/>select usernama");
        $hasil = mysql_fetch_array($query);
?>