Cannot Modify Header Error

PHP
1

I integrated Login with FB and Twitter; but I’m getting error when I click Login in Facebook link

Warning: Cannot modify header information - headers already sent by (output started at /home/delhioia/public_html/index.php:7) in /home/delhioia/public_html/facebook/index.php on line 12

check at http://delhicertificates.in/

/home/delhioia/public_html/facebook/index.php


<?php
//Always place this code at the top of the Page
if (isset($_SESSION['id'])) {
    // Redirection to login page twitter or facebook
    header("location: home.php");
}

if (array_key_exists("login", $_GET)) {
    $oauth_provider = $_GET['oauth_provider'];
    if ($oauth_provider == 'twitter') {
        header("Location: login-twitter.php");
    } else if ($oauth_provider == 'facebook') {
        header("Location: login-facebook.php");
    }
}
?>
<div style='padding-top:5px;'>
<a href="?login&oauth_provider=twitter"><img src="../img/twitter_signin.png"></a><a href="?login&oauth_provider=facebook"><img src="../img/facebook_signin.png"></a>
</div>

/home/delhioia/public_html/index.php


<?php
session_start();
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head><title>Birth, Marriage, Domicile Certificates, Passport, Voter ID Card, Aadhar/UIDAI Card, Driving Licence in Delhi</title>
<meta name="description" content="Find information, how to apply for Birth, Marriage, Domicile Certificates, Passport, Voter ID Card, Aadhar/UIDAI Card, Driving Licence issued by Delhi Govt.">
<meta name="keywords" content="birth certificate, marriage, domicile certificate, passport, voter ID card, aadhar/UIDAI card, driving licence">
<meta http-equiv="content-type" content="text/html; charset=iso-8859-1">
<meta name="google-site-verification" content="dZ_1PeO1D2NtRj0IamyazEPbRyAsOrpY33IHVI5TbyU" />
<link rel="stylesheet" type="text/css" href="style/style.css">
<script type="text/javascript" src="js/jquery-latest.js"></script>
<script type="text/javascript" src="js/jquery.min.js"></script>
</head>
<style>
li{padding-bottom:10px;}
</style>
<body>
 <!-- Page Content -->
</body>
</html>
2

Put ob_start(); at the beginning of the file this will stop the code from executing.

The reason for the issue is that there is something already being sent to the browser, this could be just one character that causes the issue. Have a look at ob_start; and its counterpart ob_end_flush;

Regards

keith

3

When I use ur suggested functions; I’m getting error…