<?php

// app/Workflows/TestIteratorWorkflow.php

namespace App\Workflows;

use Carbon\CarbonInterface;
use Log;
use Workflow\ActivityStub;
use Workflow\Workflow;

class TestIteratorWorkflow extends Workflow
{
	public function execute(int $iterations = 20)
	{

		// Do a bunch of work in dispatched activities and store their output in $dateTimes
		$dateTimes = [];
		for ($a = 0; $a < $iterations; $a++) {
			$dateTimes[] = yield ActivityStub::make(TestIteratorActivity::class);
		}

		// Now, do some calculations to see how long that took

		// Each item in the collection is a carbon date/time object. Calculate the difference between each object in
		// seconds and store all of the differences in a new collection. For example, the first item will be the
		// difference between the first item in $dateTimes and the second item in $dateTimes. The second item will be
		// the difference between the second item in $dateTimes and the third item in $dateTimes. Etc
		$carbons = collect($dateTimes);
		$differences = $carbons->map(fn(CarbonInterface $carbon, int $index) => $carbon->diffInSeconds($carbons[$index + 1] ?? null));

		// Log the smallest difference, the largest difference, and the average difference
		Log::info('Smallest Difference: ' . $differences->min());
		Log::info('Largest Difference: ' . $differences->max());
		Log::info('Average Difference: ' . $differences->avg());
		Log::info('The sum of the differences: ' . $differences->sum());

		return $dateTimes;
	}
}

<?php

// app/Workflows/TestIteratorActivity.php

namespace App\Workflows;

use Workflow\Activity;

class TestIteratorActivity extends Activity
{
	public function execute()
	{
		return now()->toImmutable();
	}
}

// Start the workflow with 20 iterations:
$workflow = WorkflowStub::make(TestIteratorWorkflow::class);
$workflow->start(20);

// Start the workflow with 200 iterations:
$workflow = WorkflowStub::make(TestIteratorWorkflow::class);
$workflow->start(200);

// existing code
$log = $this->storedWorkflow->logs()
    ->whereIndex($this->index)
    ->first();

// new code
$logs = $this->storedWorkflow->logs()->get();
$log = $logs->first(fn($log) => $log->index === $this->index);

// existing code
$nextLog = $this->storedWorkflow->logs()
    ->whereIndex($this->index)
    ->first();

// new code
$nextLog = $logs->first(fn($log) => $log->index === $this->index);