What best practices can be implemented to prevent undefined variable errors when switching between different user statuses in PHP scripts?

To prevent undefined variable errors when switching between different user statuses in PHP scripts, it is important to initialize variables with default values before using them. This can be done by checking if the variable is set using isset() function before accessing its value. 

// Initialize user status variable with a default value
$userStatus = 'guest';

// Check if user status is set and assign a new value based on user's status
if(isset($_SESSION['user_status'])) {
    $userStatus = $_SESSION['user_status'];
}

// Now $userStatus can be safely used without causing undefined variable errors
echo "User status: " . $userStatus;

Keywords

PHP error handling isset function variable scope conditional statements

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