What are the advantages of using Callable interfaces over Closures for defining callbacks in PHP?

When defining callbacks in PHP, using Callable interfaces over Closures can provide more flexibility and compatibility with different types of callable functions. Callable interfaces allow for type hinting and ensure that the callback function adheres to a specific signature, making it easier to understand and maintain the code. Additionally, Callable interfaces can be implemented by both regular functions and Closures, providing a more versatile solution for defining callbacks. 

// Using Callable interface for defining a callback function
function myCallback(callable $callback) {
    // Perform some operations
    $result = $callback();
    return $result;
}

// Example usage of myCallback function with a Closure
$result = myCallback(function() {
    return "Hello, world!";
});

echo $result; // Output: Hello, world!

Keywords

Callable interfaces Closures callbacks PHP functions advantages

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