What is the significance of the error message regarding session side-effects in PHP 4.2.3?

The error message regarding session side-effects in PHP 4.2.3 signifies that there are issues with modifying session variables after the session has been started. To solve this issue, make sure to call `session_start()` at the beginning of the script before any output is sent to the browser. Additionally, avoid modifying session variables after output has been sent. 

<?php
session_start();

// Your PHP code here
?>

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session side-effects error message PHP 4.2.3 significance

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