What are common issues when passing session data between PHP files in a frameset?

Common issues when passing session data between PHP files in a frameset include not starting the session in each file, not properly setting or retrieving session variables, and potential cross-domain security restrictions. To solve this, make sure to start the session in each PHP file that needs to access session data, set session variables using $_SESSION superglobal, and ensure that all files are on the same domain to avoid security issues. 

// File 1: start_session.php
session_start();
$_SESSION['username'] = 'JohnDoe';

// File 2: retrieve_session.php
session_start();
echo $_SESSION['username'];

Keywords

session data PHP files frameset cross-origin session hijacking

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