What is the importance of using session_start() in PHP scripts that utilize $_SESSION variables?

Using session_start() is important in PHP scripts that utilize $_SESSION variables because it initializes a session or resumes the current one, allowing you to store and access session data across multiple pages. Without session_start(), the $_SESSION variables will not persist between pages, leading to loss of data or functionality. 

<?php
session_start();

// Access or set session variables
$_SESSION['username'] = 'JohnDoe';

// Use session variables in your script
echo 'Welcome, ' . $_SESSION['username'];
?>

Keywords

session_start PHP scripts $_SESSION variables importance security

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