RainLab\Pages\Classes\Snippet::preprocessPropertyValues PHP Method

    protected static function preprocessPropertyValues($theme, $snippetCode, $componentClass, $properties)
    {
        $snippet = SnippetManager::instance()->findByCodeOrComponent($theme, $snippetCode, $componentClass, true);
        if (!$snippet) {
            throw new ApplicationException(Lang::get('rainlab.pages::lang.snippet.not_found', ['code' => $snippetCode]));
        }
        $properties = array_change_key_case($properties);
        $snippetProperties = $snippet->getProperties();
        foreach ($snippetProperties as $propertyInfo) {
            $propertyCode = $propertyInfo['property'];
            $lowercaseCode = strtolower($propertyCode);
            if (!array_key_exists($lowercaseCode, $properties)) {
                if (array_key_exists('default', $propertyInfo)) {
                    $properties[$propertyCode] = $propertyInfo['default'];
                }
            } else {
                $markupPropertyInfo = $properties[$lowercaseCode];
                unset($properties[$lowercaseCode]);
                $properties[$propertyCode] = $markupPropertyInfo;
            }
        }
        return $properties;
    }