DesignPatternsPHP/Behavioral/Command/Invoker.php

<?php
declare(strict_types=1);

namespace DesignPatterns\Behavioral\Command;

/**
 * Invoker is using the command given to it.
 * Example : an Application in SF2.
 */
class Invoker
{
    /**
     * @var CommandInterface
     */
    private $command;

    /**
     * in the invoker we find this kind of method for subscribing the command
     * There can be also a stack, a list, a fixed set ...
     *
     * @param CommandInterface $cmd
     */
    public function setCommand(CommandInterface $cmd)
    {
        $this->command = $cmd;
    }

    /**
     * executes the command; the invoker is the same whatever is the command
     */
    public function run()
    {
        $this->command->execute();
    }
}