How can sessions be properly managed in PHP to avoid undefined errors in variables?

To properly manage sessions in PHP and avoid undefined errors in variables, it is important to check if a session variable is set before accessing it. This can be done using the isset() function to determine if the variable is set in the session. 

// Start the session
session_start();

// Check if the session variable is set before accessing it
if(isset($_SESSION['variable_name'])) {
    $value = $_SESSION['variable_name'];
    // Use the variable
} else {
    // Handle the case when the variable is not set
}

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