What are common issues with passing session variables between PHP files and how can they be resolved?

Common issues with passing session variables between PHP files include not starting the session in each file, not properly setting or retrieving session variables, and potential security risks if session variables are not sanitized. To resolve these issues, make sure to start the session in each PHP file using session_start(), set session variables using $_SESSION['variable'] = value, and retrieve them using $_SESSION['variable']. Additionally, always sanitize and validate session variables to prevent security vulnerabilities. 

// File 1: start the session and set a session variable
session_start();
$_SESSION['username'] = 'john_doe';

// File 2: start the session and retrieve the session variable
session_start();
$username = $_SESSION['username'];
echo $username;

Keywords

session variables PHP files passing data session_start() session_destroy()

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