Fiber exemple 2-3: raw execution

raw-exec.php

<?php

declare(strict_types=1);

class RawExecutionWithoutWaitingForResult
{
    public function execute(string $file, int $requestId): void
    {
        \Fiber::suspend();

        // We do not wait for the output, otherwise it would be blocking.
        exec('php ' . __DIR__ . "/{$file}.php $requestId > /dev/null 2>&1 &");

        // Check if finished, else suspend itself
        while (!file_exists("response_{$requestId}.txt")) {
            \Fiber::suspend(); // Otherwise we block the thread, anf Fiber becomes useless.
        }

        echo PHP_EOL . "Request with id #$requestId is finished";
    }
}