How does the absence of session_start impact the functionality of PHP code that relies on session variables?

When session_start is not called, session variables cannot be accessed or set in PHP code. To fix this issue, session_start must be called at the beginning of the script to initialize the session and allow for the use of session variables. 

<?php
session_start();

// PHP code that relies on session variables can now be used here
?>

Keywords

session_start PHP code session variables functionality impact

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