How can the use of session variables in PHP impact the behavior of scripts and potential errors like "headers already sent"?

When using session variables in PHP, it's important to ensure that no output is sent to the browser before setting or modifying session variables, as this can lead to the "headers already sent" error. To avoid this issue, make sure to start the session at the beginning of the script before any output is generated. 

<?php
session_start();

// Rest of your PHP code goes here
?>

Keywords

session variables PHP headers already sent behavior errors

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