Command Pattern implementation using Anonymous functions instead of objects

command-pattern.php

<?php
/**
 * Lamp object to be manipulated because a Lamp is a thing
 */
class Lamp {
    public function turn_on() {
        echo 'The light is on' . PHP_EOL;
    }
    public function turn_off() {
        echo 'the light is off' . PHP_EOL;
    }
}

/**
 * Returns the client to process commands for a lamp
 * 
 * @param Lamp $lamp
 * @return callable
 */
function light_switch_client(Lamp $lamp) {
    return function(callable $command) use ($lamp) {
        return $command($lamp);
    };
}

## commands
/**
 * Returns a command to turn a lamp on
 * 
 * @return callable
 */
function turn_on_command() {
    return function (Lamp $lamp) {
        $lamp->turn_on();
    };
}

/**
 * Returns a command to turn a lamp off
 * 
 * @return callable
 */
function turn_off_command() {
    return function (Lamp $lamp) {
        $lamp->turn_off();
    };
}

$client = light_switch_client(new \Lamp());

$client(turn_on_command()); // The light is on

$client(turn_off_command()); // The light is off

$ php command-pattern.php
The light is on
the light is off