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What potential pitfalls can arise when setting sessions in PHP, as seen in the provided code snippet?

Potential pitfalls that can arise when setting sessions in PHP include not properly starting the session before setting any session variables and not checking if the session has already been started before attempting to start it again. To solve this, always start the session at the beginning of the script before setting any session variables and use session_status() to check if the session has already been started.

php 
<?php
// Always start the session at the beginning of the script
session_start();

// Check if the session has already been started before starting it again
if (session_status() === PHP_SESSION_NONE) {
    session_start();
}

// Set session variables
$_SESSION['username'] = 'example_user';
$_SESSION['email'] = 'example@example.com';
?>

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