How can the isset() function be effectively utilized to prevent session variable issues in PHP scripts?

Session variable issues can be prevented in PHP scripts by using the isset() function to check if a session variable is set before trying to access its value. This helps prevent errors or warnings when accessing unset session variables. Example PHP code snippet: 

session_start();

// Check if the session variable is set before accessing its value
if(isset($_SESSION['user_id'])) {
    $user_id = $_SESSION['user_id'];
    // Proceed with using the $user_id variable
} else {
    // Handle the case when the session variable is not set
}

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