What are the potential reasons for a session variable not being written or read properly in PHP?

The potential reasons for a session variable not being written or read properly in PHP could include issues with session configuration, such as session.save_path not being set correctly, session.auto_start being enabled, or session variables not being properly initialized. To solve this issue, ensure that session_start() is called at the beginning of every page where session variables are used, check the session configuration settings in php.ini, and make sure that session variables are properly set and accessed. 

// Ensure session_start() is called at the beginning of every page
session_start();

// Check session configuration settings in php.ini
// Make sure session.save_path is set correctly

// Set session variable
$_SESSION['username'] = 'john_doe';

// Read session variable
$username = $_SESSION['username'];
echo $username;

Keywords

session variable PHP writing reading error

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