How can one address the session side-effect warning in PHP 4.2.3?

The session side-effect warning in PHP 4.2.3 occurs when headers are sent before session_start() is called. To address this warning, make sure that session_start() is called before any output is sent to the browser. This can be achieved by moving session_start() to the very beginning of the PHP script. 

<?php
// Start the session before any output is sent
session_start();

// Rest of the PHP code goes here
?>

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session side-effect warning PHP 4.2.3 address

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