never show login page after login php

Question

I am new to PHP
i am making a simple login functionality for user with php & mysql

Here i want to make a simple thing where when a user after "loggingin" if presses back button he shouldn't get the login page back on screen.
I have tried using JS history.forward but its little wierd...

It shows glimps of login page for a second and takes back user to same page from where he presses back button...

How to make a facebook like functionality where login page never appears after loging in even on pressing back button..

Please HELP...:)

<?php

include_once 'conn.php';
if (isset($_SESSION['username'])) {
    header('location:home.php');
}

if (isset($_REQUEST['btnsignin'])) {
    if ($_REQUEST['txtemail'] <> "" && $_REQUEST['txtpass'] <> "") {
        $email = $_REQUEST['txtemail'];
        $pass = $_REQUEST['txtpass'];
        $q = mysql_query("SELECT * FROM register WHERE emailid = '" . $email . "' && password = '" . $pass . "'");
        while ($row = mysql_fetch_assoc($q)) {
            $_SESSION['username'] = $email;
            $_SESSION['userid'] = $row['uid'];
            header('location:home.php');
        }
    }
}
?>

yes added.......i have added it in conn.php with a check of if(!isset($_SESSION)) then session_start — AmIt PagarIa, Mar 21 '14 at 11:28
This won't work. Your `if(!isset($_SESSION))` won't work if you haven't called `session_start();` And why do you want to do a `session_start();` with conditions? No need — Tzar, Mar 21 '14 at 11:33
if i donot give conditions it throws warning of session already started..(from the earlier page) — AmIt PagarIa, Mar 21 '14 at 11:34

score 1 · Answer 1 · answered Mar 21 '14 at 11:35

1

You always want to add exit; after the header() function to prevent the code block below from execution.

answered Mar 21 '14 at 11:35

sunshinejr

4,834
2
22
32

You definitely should use exit();. Otherwise the script execution is not terminated. exit(header("Location: http:// example . com")); or header("Location: http:// example . com"); exit(); See: http://stackoverflow.com/a/3553710/3437255 – Danny Mar 21 '14 at 11:47

score 0 · Answer 2 · answered Mar 21 '14 at 11:30

0

try to use 'AND' in place of '&&' in your sql query.

answered Mar 21 '14 at 11:30

Himanshu

4,327
16
31
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use session_start(); as Written by @maulik – Himanshu Mar 21 '14 at 11:34

score 0 · Answer 3 · answered Mar 21 '14 at 11:31

0

you have to start session in php before set it. you can session start with.

 include_once 'conn.php';
 session_start();  //add this line in your code.
   if (isset($_SESSION['username']))
    {
   header('location:home.php');
    }

answered Mar 21 '14 at 11:31

Maulik Kanani

642
6
22

if you neww in php than you can also follow my blog. "http://study-php-example.blogspot.in/" if you like than give me rate on stack overflow. – Maulik Kanani Mar 21 '14 at 15:26

never show login page after login php

3 Answers3