How can anonymous functions with "use" be used to work around the limitation of initializing session variables in function headers in PHP?

When initializing session variables in function headers in PHP, the session must be started before any output is sent to the browser. This can be a limitation when using anonymous functions. One way to work around this limitation is to use the "use" keyword in anonymous functions to access the session variables within the function scope without needing to initialize them in the function header. 

// Start the session
session_start();

// Initialize session variables
$_SESSION['username'] = 'john_doe';

// Define an anonymous function that uses the session variable
$anonymousFunction = function() use ($_SESSION) {
    echo 'Hello, ' . $_SESSION['username'];
};

// Call the anonymous function
$anonymousFunction();

Keywords

anonymous functions use keyword session variables function headers PHP

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