An example for pause and continue execution using loop/generators with ReactPHP ft Future Tick.

Pause-Wait-Exec.php

<?php

/**
 * An example for pause and continue execution using loop/generators with ReactPHP ft Future Tick.
 * 
 */
require_once __DIR__ . '/vendor/autoload.php';

use React\EventLoop\Loop;
use function React\Promise\Timer\sleep;

$loop = new Loop;

//in seconds
define('WAIT_TIME', 10.0);
define('BATCH_SIZE', 5);

$iterate = iterate();

$batchProcess = function () use ($loop, &$batchProcess, $iterate) {
    // time is defined based on the vaildity and entry of loop;
    // if wait time is zero the the execution wont wait
    $time = $iterate->current() > 1 && $iterate->valid() ? WAIT_TIME : 0;

    // Wait or pause main execution
    if ($time > 0) {
        echo PHP_EOL;
        echo '⌛  for ' . $time . ' seconds ⏲ '.PHP_EOL;
        echo PHP_EOL;
    }
    sleep($time)->then(function () use ($loop, $batchProcess, $iterate) {
        try {
            //Run a batch process
            while ($iterate->valid()) {
                $current = $iterate->current();

                doTask($current);

                if (invalidCondition()) {
                    //throw new Exception("invalid");
                }
                if ($current % BATCH_SIZE === 0) {
                    break;
                }
                $iterate->next();
            }
            $iterate->next();
        } catch (Throwable) {
            // make invalid generator for any error
            $iterate = fn () => yield from [];
        }
        if ($iterate->valid()) {
            //Continue calling main function till the loop is valid
            $loop->futureTick($batchProcess);
        }
    });
};

$doThis = fn () => $loop->futureTick($batchProcess);

//Start Process
$doThis();

$loop->run();

echo 'Process Ended!!';


//Main Task

function iterate(): \Generator
{
    yield from range(1, (BATCH_SIZE * 2));
}

//Child Task
function doTask(int $input): void
{
    printf('Running Task %s%s', $input, PHP_EOL);
}


//Condition to break loop
function invalidCondition(): bool
{
    return 1 !== 2;
}

Output: