How can the placement of "session_start();" affect the functionality of PHP sessions in a script?

Placing "session_start();" at the beginning of a PHP script is crucial for starting a session and accessing session variables throughout the script. If "session_start();" is not placed before any session-related code, such as setting or accessing session variables, the session may not be properly initialized, leading to issues with session functionality. 

<?php
session_start();

// Your PHP code utilizing session variables goes here
?>

Keywords

session_start PHP sessions functionality script placement

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