TaskSet::count

(PHP 8.6+, True Async 1.0)

public TaskSet::count(): int

Returns the number of tasks that have not yet been delivered to the consumer.

Unlike TaskGroup::count(), which returns the total number of tasks, TaskSet::count() decreases with each result delivery via joinNext(), joinAny(), joinAll(), or foreach.

TaskSet implements Countable, so you can use count($set).

Return Value

The number of tasks in the set.

Examples

Example #1 Tracking progress

<?php

use Async\TaskSet;

spawn(function() {
    $set = new TaskSet();

    $set->spawn(fn() => "a");
    $set->spawn(fn() => "b");
    $set->spawn(fn() => "c");

    echo $set->count() . "\n"; // 3

    $set->joinNext()->await();
    echo $set->count() . "\n"; // 2

    $set->joinNext()->await();
    echo $set->count() . "\n"; // 1

    $set->joinNext()->await();
    echo $set->count() . "\n"; // 0
});

See Also

• TaskSet::isFinished — Check if all tasks are finished
• TaskSet::joinNext — Get the next result