Why is it necessary to start a session on every page in a PHP application that utilizes sessions?

It is necessary to start a session on every page in a PHP application that utilizes sessions because sessions are used to store user data across multiple pages. Without starting a session on each page, the stored data will not persist between page loads. 

<?php
session_start();

// Your PHP code here
?>

Keywords

session_start PHP application sessions security authentication

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