predis/lib/Predis/Protocol/Text/ResponseIntegerHandler.php

<?php

namespace Predis\Protocol\Text;

use Predis\Helpers;
use Predis\Protocol\IResponseHandler;
use Predis\Protocol\ProtocolException;
use Predis\Network\IConnectionComposable;

class ResponseIntegerHandler implements IResponseHandler
{
    public function handle(IConnectionComposable $connection, $number)
    {
        if (is_numeric($number)) {
            return (int) $number;
        }

        if ($number !== 'nil') {
            Helpers::onCommunicationException(new ProtocolException(
                $connection, "Cannot parse '$number' as numeric response"
            ));
        }

        return null;
    }
}