How can a function returning another function be utilized in PHP?

To utilize a function returning another function in PHP, you can create a higher-order function that returns a closure (anonymous function). This allows you to encapsulate functionality and create more flexible and reusable code. The returned function can then be stored in a variable and called as needed. 

// Function returning another function
function greet($greeting) {
    return function ($name) use ($greeting) {
        echo $greeting . ', ' . $name . '!';
    };
}

// Get the returned function
$greetHello = greet('Hello');

// Call the returned function
$greetHello('John'); // Output: Hello, John!

Keywords

function composition higher-order functions closures anonymous functions callback functions

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