Predis\Command\CommandInterface::getArgument PHP Method

    public function getArgument($index);

 private function storeDebug(CommandInterface $command, $direction)
 {
     $firtsArg = $command->getArgument(0);
     $timestamp = round(microtime(true) - $this->tstart, 4);
     $debug = $command->getId();
     $debug .= isset($firtsArg) ? " {$firtsArg} " : ' ';
     $debug .= "{$direction} {$this}";
     $debug .= " [{$timestamp}s]";
     $this->debugBuffer[] = $debug;
 }