Documentation

Learn how to use TrueAsync for building concurrent PHP applications.

TaskGroup::finally

(PHP 8.6+, True Async 1.0)

public TaskGroup::finally(Closure $callback): void

Registers a callback that is invoked when the group is sealed and all tasks have completed. The callback receives the TaskGroup as a parameter.

Since cancel() implicitly calls seal(), the handler also fires on cancellation.

If the group is already finished, the callback is called synchronously immediately.

Parameters

callback
A Closure that takes TaskGroup as its only argument.

Examples

Example #1 Logging completion

<?php

use Async\TaskGroup;

spawn(function() {
    $group = new TaskGroup();

    $group->finally(function(TaskGroup $g) {
        echo "Completed: " . $g->count() . " tasks\n";
    });

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

    $group->seal();
    $group->all();
});
// Output:
// Completed: 2 tasks

Example #2 Calling on an already finished group

<?php

use Async\TaskGroup;

spawn(function() {
    $group = new TaskGroup();
    $group->spawn(fn() => 1);
    $group->seal();
    $group->all();

    // Group is already finished — callback is called synchronously
    $group->finally(function(TaskGroup $g) {
        echo "called immediately\n";
    });

    echo "after finally\n";
});
// Output:
// called immediately
// after finally

See Also