Cooperative Multitasking with PHP Fibers

example.php

<?php

final class Deployment
{
    /**
     * @param array<string, list<string>> $pipelineStages
     */
    public function run(array $pipelineStages): void
    {
        $pipeline = new Fiber(function (array $pipelineStages): string {
            Fiber::suspend('Pipeline initialized.');

            foreach ($pipelineStages as $stage => $steps) {
                foreach ($steps as $step) {
                    Fiber::suspend("Stage '{$stage}': step '{$step}' completed.");
                }
            }

            return 'Deployment successful.';
        });

        $monitor = new Fiber(function (): string {
            Fiber::suspend('Monitoring system initialized.');

            while (true) {
                Fiber::suspend('System health: OK.');
            }
        });

        $pipeline->start($pipelineStages);
        $monitor->start();

        while (! $pipeline->isTerminated()) {
            printf("[Pipeline] %s\n", $pipeline->resume());
            printf("[Monitor]  %s\n", $monitor->resume());
        }

        $result = $pipeline->getReturn();
        printf("[Result]   %s\n", $result);
    }
}

$stages = [
    'build' => ['compile', 'lint', 'optimize'],
    'test' => ['unit', 'integration', 'e2e'],
    'package' => ['zip', 'sign'],
    'deploy' => ['upload', 'release', 'notify'],
];

(new Deployment())->run($stages);

output.md

Output

Pipeline] Stage 'build': step 'compile' completed.
[Monitor]  System health: OK.
[Pipeline] Stage 'build': step 'lint' completed.
[Monitor]  System health: OK.
[Pipeline] Stage 'build': step 'optimize' completed.
[Monitor]  System health: OK.
[Pipeline] Stage 'test': step 'unit' completed.
[Monitor]  System health: OK.
[Pipeline] Stage 'test': step 'integration' completed.
[Monitor]  System health: OK.
[Pipeline] Stage 'test': step 'e2e' completed.
[Monitor]  System health: OK.
[Pipeline] Stage 'package': step 'zip' completed.
[Monitor]  System health: OK.
[Pipeline] Stage 'package': step 'sign' completed.
[Monitor]  System health: OK.
[Pipeline] Stage 'deploy': step 'upload' completed.
[Monitor]  System health: OK.
[Pipeline] Stage 'deploy': step 'release' completed.
[Monitor]  System health: OK.
[Pipeline] Stage 'deploy': step 'notify' completed.
[Monitor]  System health: OK.
[Pipeline] 
[Monitor]  System health: OK.
[Result]   Deployment successful.

// https://3v4l.org/8GI6K