amp/lib/Internal/Watcher.php

<?php

namespace Amp\Internal;

class Watcher {
    const DEFER = 0b00000001;
    const TIMER = 0b00000110;
    const DELAY = 0b00000010;
    const REPEAT = 0b00000100;
    const IO = 0b00011000;
    const READABLE = 0b00001000;
    const WRITABLE = 0b00010000;
    const SIGNAL = 0b00100000;

    /** @var int */
    public $type;

    /** @var bool */
    public $enabled = true;

    /** @var bool */
    public $referenced = true;

    /** @var string */
    public $id;

    /** @var callable */
    public $callback;

    /**
     * Data provided to the watcher callback.
     *
     * @var mixed
     */
    public $data;

    /**
     * Watcher-dependent value storage. Stream for IO watchers, signo for signal watchers, interval for timers.
     *
     * @var mixed
     */
    public $value;
}