php code working on localhost but not working online

[suchait]

my login php script is working on my localhost(OS:ubuntu)

but when i put it online its not working.

php code for login script:

<?php
include('config.php');  //including configuration file
session_start();   //starting session
if($_SERVER["REQUEST_METHOD"]=="POST")
{
$myusername=addslashes($_POST['user_name']);  //getting username from form
$mypassword=addslashes($_POST['pass_word']);  //gettting password  from form 
$mypassword=md5($mypassword);   hashing password with md5
$sql="select id from userinformation2 WHERE username='$myusername' and password='$mypassword' ";  //getting id from database of user
$result=mysql_query($sql);
$row=mysql_fetch_array($result);
$active=$row['active'];
$count=mysql_num_rows($result);
if($count==1)   //checking if user is present or not
{
session_register("myusername");  if user is present then register session
$_SESSION['login_user']=$myusername;  set login user a current user using global array
header("location:welcome.php");   moving it to welcome page 
}
else
{
$error="name and password is invalid";
echo $error;
}
}
?>

[Dormilich]

if it’s not working there must be error messages (might be in the error.log).

[suchait]

no error is presented in error.log file regarding this script.....
i think session isn't working .....

[suchait]

when i put error_reporting(E_ALL);
ini_set('display_errors', 'On');

function on my script it shows me the warning that why its not working

Warning: Unknown: Your script possibly relies on a session side-effect which existed until PHP 4.2.3. Please be advised that the session extension does not consider global variables as a source of data, unless register_globals is enabled. You can disable this functionality and this warning by setting session.bug_compat_42 or session.bug_compat_warn to off, respectively in Unknown on line 0

[Dormilich]

do the following:

You can disable this functionality and this warning by setting session.bug_compat_42 or session.bug_compat_warn to off,

[suchait]

yeah
i am using
ini_set('session.bug_compat_warn', 0);
ini_set('session.bug_compat_42', 0);

now its not giving warning but not redirecting the page welcome.php
see the code
header('location:welcome.php);

[Dormilich]

include "welcome.php";

since you don’t have output (at least I hope you don’t have), there is no benefit in a redirect.

[suchait]

@Dormilich

thnx for replies frd
but i have a lot ouputs in welcome.php

so i need to redirect the page to welcome.php

[Dormilich]

I don’t understand. to display welcome.php you need output. whether you do that directly or via a separate HTTP request doesn’t matter.