What are some best practices for handling user authentication and login functionality in PHP to avoid header modification errors?

When handling user authentication and login functionality in PHP, it is important to avoid header modification errors by ensuring that no output is sent before calling the header() function. To achieve this, you can use output buffering to capture any output before sending headers. 

<?php
ob_start();

// Your authentication and login code here

ob_end_flush();

Keywords

PHP user authentication login functionality header modification errors security.

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