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How can the issue of session variables not being passed correctly between pages be resolved in a PHP application?

Issue: The issue of session variables not being passed correctly between pages in a PHP application can be resolved by ensuring that session_start() is called on every page where session variables are being used.

php 
// Fix for session variables not being passed correctly between pages
session_start();

// Set session variable
$_SESSION['username'] = 'JohnDoe';

// Retrieve session variable on another page
session_start();
echo $_SESSION['username'];

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