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

<?php

namespace Predis\Protocol\Text;

use Predis\Commands\ICommand;
use Predis\Protocol\ICommandSerializer;

class TextCommandSerializer implements ICommandSerializer
{
    public function serialize(ICommand $command)
    {
        $commandId = $command->getId();
        $arguments = $command->getArguments();

        $cmdlen = strlen($commandId);
        $reqlen = count($arguments) + 1;

        $buffer = "*{$reqlen}\r\n\${$cmdlen}\r\n{$commandId}\r\n";

        for ($i = 0; $i < $reqlen - 1; $i++) {
            $argument = $arguments[$i];
            $arglen = strlen($argument);
            $buffer .= "\${$arglen}\r\n{$argument}\r\n";
        }

        return $buffer;
    }
}