Jade\Compiler\SubCodeHandler::addToOutput PHP Method

    public function addToOutput(&$output, &$key, &$value)
    {
        return function () use(&$output, &$key, &$value) {
            foreach (array('key', 'value') as $var) {
                ${$var} = trim(${$var});
                if (empty(${$var})) {
                    continue;
                }
                if (preg_match('/^\\d*[a-zA-Z_]/', ${$var})) {
                    ${$var} = var_export(${$var}, true);
                }
            }
            $output[] = empty($value) ? $key : $key . ' => ' . $value;
            $key = '';
            $value = null;
        };
    }