What potential issues can arise when using PHP sessions in conjunction with header redirects?

One potential issue that can arise when using PHP sessions in conjunction with header redirects is the "headers already sent" error. This error occurs when there is output sent to the browser before the header() function is called, which disrupts the ability to set session variables or perform redirects. To solve this issue, you can use output buffering to capture any output before sending headers. 

<?php
ob_start(); // Start output buffering

// Start the session
session_start();

// Set session variables
$_SESSION['username'] = 'example';

// Redirect after setting session variables
header('Location: new_page.php');

ob_end_flush(); // Flush the output buffer
?>

Keywords

PHP sessions header redirects session data loss session hijacking session fixation

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