php session is not working in server - php

Question

I want after register the page should continue with session. for that i have create following code.
if($_POST['action']=='finder_quick_reg')
{
extract($_POST);
print_r($_POST);
$result=$dbg->exec("INSERT INTO `login_register`(`email`, `password`, `reg_date`, `complite_register`, `type`) VALUES ('$client_mail','$client_password', now(),'0','c_finder')") or die("Insert Failed ".mysql_error());
$lastId = $dbg->lastInsertId();
$results=$dbg->exec("INSERT INTO `care_finder`(`postal_code`,`user_pic`, `login_id`,`f_name`, `l_name`, `gender` ) VALUES ('$postal_code', 'default.jpg','$lastId', '$f_name', '$l_name', '$gender')")or die("Insert Failed ".mysql_error());
}
else{echo 'error';}
if($results){
include_once 'connection.php';
$con=new connection();
$dbg=$con->db;
$sql="SELECT * FROM `login_register` WHERE `login_id`='$lastId'";
$stmt=$dbg->query($sql);
$rows=$stmt->fetch(PDO::FETCH_ASSOC);
session_start();
//echo $lastId;
$_SESSION['Uname']=$rows['email'];
$_SESSION['pword']=$rows['password'];
$_SESSION['Utype']=$rows['type'];
$_SESSION['Uid']=$rows['login_id'];
}
after this db.php page it will go to user_index.php
following code is using in user_index.php
<?php
session_start();
if (!isset($_SESSION['Uname'])) {
//header("location:index.php");
echo 'no sesseion';
}
else {
......
......
}
can some one help me

Answer 1

You're outputting before starting the session
if($_POST['action']=='finder_quick_reg')
{
// ...
print_r($_POST);
// ...
}
else { echo 'error'; }
And from the title I'd assume that error_reporting is turned off on the production server, otherwise you'd have seen an error message along the lines of
Warning: Cannot modify header information - headers already sent...
You should start the session exactly like in you're doing in your other file - at the very beginning of it, before all other statements.
On a side note, have a look at the point notes in the documentation for export() function, there it's written why/that it's a bad idea to use it on untrusted data.

Answer 2

session_start();
should come from login page on.