CollectingLogger.php

<?php

namespace Chrisguitarguy\Example;

use OutOfBoundsException;
use Countable;
use IteratorAggregate;
use Psr\Log\AbstractLogger;

class CollectingLogger extends AbstractLogger implements Countable, IteratorAggregate
{
    private array $messages = [];

    public function log($level, $message, array $context=[]) : void
    {
        $this->messages[] = [
            'level' => $level,
            'message' => $message,
            'context' => $context,
        ];
    }

    public function getIterator() : iterable
    {
        yield from $this->messages;
    }

    public function count() : int
    {
        return count($this->messages);
    }

    public function at(int $idx) : array
    {
        if (!isset($this->messages[$idx])) {
            throw new OutOfBoundsException();
        }

        return $this->messages[$idx];
    }
}