Flitch\Cli\ArgumentParser::parseLongOption PHP Method

    protected function parseLongOption($option, $argument, array $options, &$argumentIndex)
    {
        $index = null;
        $exact = false;
        $ambiguous = false;
        $optionName = substr($option, 2);
        for ($length = 0; isset($option[$length + 2]) && $option[$length + 2] !== '='; $length++) {
        }
        foreach ($options as $i => $optionData) {
            if (!strncmp($optionData['name'], $optionName, $length)) {
                if (strlen($optionName) === strlen($optionData['name'])) {
                    $index = $i;
                    $exact = true;
                    break;
                } elseif ($index === null) {
                    $index = $i;
                } elseif ($options[$index]['code'] !== $optionData['code'] || $options[$index]['has_arg'] !== $optionData['has_arg']) {
                    $ambiguous = true;
                }
            }
        }
        if ($ambiguous && !$exact) {
            $this->error = sprintf('Option "%s" is ambigiuous', $option);
            return false;
        } elseif ($index === null) {
            $this->error = sprintf('Unrecognized option "%s"', $option);
            return false;
        }
        $argumentIndex++;
        if (isset($option[$length + 2])) {
            if ($options[$index]['has_arg'] === false) {
                $this->error = sprintf('Option "%s" doesn\'t allow an argument', $option);
                return false;
            } elseif ($options[$index]['has_arg'] === true && !isset($option[$length + 3])) {
                $this->error = sprintf('Option "%s" requires an argument', $option);
                return false;
            }
            $this->options[] = array('code' => $options[$index]['code'], 'argument' => substr($option, $length + 3));
            return true;
        }
        if ($options[$index]['has_arg'] === true) {
            if (!$argument || !isset($argument[0])) {
                $this->error = sprintf('Option "%s" requires an argument', $option);
                return false;
            }
            $argumentIndex++;
            $this->options[] = array('code' => $options[$index]['code'], 'argument' => $argument);
            return true;
        }
        $this->options[] = array('code' => $options[$index]['code'], 'argument' => null);
        return true;
    }