PHP Anonymous Functions Example Implementation

In PHP, an anonymous method is usually referred to as an anonymous function or a closure. These are functions defined without a name, and they're often used as callbacks or for short-term use.

Here are a few example usages of anonymous methods (closures) in PHP:

1. Assign to a Variable
   
   $greet = function($name) {
return "Hello, $name!";
};
echo $greet("Mike"); // Output: Hello, Mike!
   
   
2. Use as Callback (e.g., array_map)
   
   $numbers = [1, 2, 3, 4];
$squared = array_map(function($n) { return $n * $n; }, $numbers);
print_r($squared); // Output: [1, 4, 9, 16]
   
   
3. Use with use to Capture Variables from Parent Scope
   
   $multiplier = 5;
$multiply = function($n) use ($multiplier) {
return $n * $multiplier;
};
echo $multiply(10); // Output: 50
   
   
4. Inside of a Class as a Property
   
   class Greeter {
public $greet;
public function __construct() {
$this->greet = function($name) {
return "Hi, $name!";
};
}
}
$greeter = new Greeter();
echo ($greeter->greet)("Ralph"); // Output: Hi, Ralph!

Remember to wrap class and property inside of parentheses. It's necessary in that specific form because $greeter->greet is a property that holds a closure, not a method. PHP interprets $greeter->greet("Taylor") as trying to call a method named greet, not a closure stored in a property.

5. Anonymous Method Bound to Object (Closure::bind)

class Person {
     private $name = "Secret Name";
}
$getName = function() {
return $this->name;
};
$person = new Person();
$bound = $getName->bindTo($person, 'Person');
echo $bound(); // Output: Secret Name

If you would like more examples or have a question please shoot me a comment. Thanks!