PHP マニュアル: Stacking work

public int Worker::stack(Threaded &$work)

Appends the new work to the stack of the referenced worker.

The new size of the stack.

例1 Stacking a task for execution onto a worker

<?php
$worker = new Worker();
$work = new class extends Threaded {};

var_dump($worker->stack($work));

上の例の出力は以下となります。

int(1)