PhpBrew\VariantBuilder::buildDisableVariant PHP Method

    public function buildDisableVariant(Build $build, $feature, $userValue = null)
    {
        if (isset($this->variants[$feature])) {
            if (in_array('-' . $feature, $this->builtList)) {
                return array();
            }
            $this->builtList[] = '-' . $feature;
            $func = $this->variants[$feature];
            // build the option from enabled variant,
            // then convert the '--enable' and '--with' options
            // to '--disable' and '--without'
            $args = is_string($userValue) ? array($build, $userValue) : array($build);
            if (is_string($func)) {
                $disableOptions = (array) $func;
            } elseif (is_callable($func)) {
                $disableOptions = (array) call_user_func_array($func, $args);
            } else {
                throw new Exception('Unsupported variant handler type. neither string nor callable.');
            }
            $resultOptions = array();
            foreach ($disableOptions as $option) {
                // strip option value after the equal sign '='
                $option = preg_replace('/=.*$/', '', $option);
                // convert --enable-xxx to --disable-xxx
                $option = preg_replace('/^--enable-/', '--disable-', $option);
                // convert --with-xxx to --without-xxx
                $option = preg_replace('/^--with-/', '--without-', $option);
                $resultOptions[] = $option;
            }
            return $resultOptions;
        }
        throw new Exception("Variant {$feature} is not defined.");
    }