Handler.php

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<?php
 
namespace PlanetTeamSpeak\TeamSpeak3Framework\Helper\Signal;
 
use PlanetTeamSpeak\TeamSpeak3Framework\Exception\SignalException;

class Handler
{
    protected string $signal;

    protected mixed $callback;

    public function __construct(string $signal, mixed $callback)
    {
        $this->signal = $signal;
 
        if (!is_callable($callback)) {
            throw new SignalException("invalid callback specified for signal '" . $signal . "'");
        }
 
        $this->callback = $callback;
    }

    public function call(array $args = []): mixed
    {
        return call_user_func_array($this->callback, $args);
    }
}