PHP Variable Functions

Variable functions and closures give you powerful ways to work with functions dynamically. Perfect for callbacks, event handlers, and functional programming!

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Variable Functions

<?php
function sayHello() {
    return "Hello!";
}

$func = 'sayHello';
echo $func();  // Calls sayHello()
?>

Anonymous Functions (Closures)

<?php
$greet = function($name) {
    return "Hello, $name!";
};

echo $greet("Alice");
?>

The use Keyword

<?php
$message = "Welcome";
$greeter = function($name) use ($message) {
    return "$message, $name!";
};

echo $greeter("Bob");
?>

Summary

What's Next?

Next, learn about Arrow Functions - the modern, concise syntax in PHP 7.4+!