How important is the proper placement of session_start() function calls in PHP scripts to ensure the correct functioning of session variables?

The proper placement of session_start() function calls in PHP scripts is crucial to ensure the correct functioning of session variables. This function must be called before any output is sent to the browser, as it sets up the session data and headers. Failure to call session_start() at the right place can lead to session variables not being stored or retrieved properly. 

<?php
session_start();

// Rest of your PHP code here
?>

Keywords

session_start PHP scripts session variables correct functioning placement

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