How can the use of session_start() impact the retrieval of user data in PHP?

Using session_start() before attempting to retrieve user data is essential in PHP as it initializes a session or resumes the current one. Without calling session_start(), the session variables won't be accessible. To ensure that user data can be retrieved successfully, always start the session before trying to access any session variables. 

<?php
session_start();

// Retrieve user data from session
$userData = $_SESSION['userData'];

// Use the user data as needed
echo "Hello, " . $userData['username'];
?>

Keywords

session_start user data retrieval PHP session variables session management

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