What are the potential pitfalls of using session_start() in PHP?

One potential pitfall of using session_start() in PHP is that it must be called before any output is sent to the browser. If output is sent before session_start(), it will result in a "headers already sent" error. To solve this issue, you can ensure that session_start() is called at the beginning of your PHP script before any HTML or whitespace. 

<?php
// Start the session at the beginning of the script
session_start();

// Rest of your PHP code goes here
?>

Keywords

session_start PHP session hijacking security vulnerability session fixation

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