public function addIfExists($file_path, $media = 'screen', $condition = null)
    {
        $_fp = $this->__template->findAsset($file_path);
        if ($_fp || \AssetsManager\Loader::isUrl($file_path)) {
            return $this->add($file_path, $media, $condition);
        }
        return $this;
    }
public function addIfExists($file_path, $media = 'screen', $condition = null)
    {
        $_fp = $this->__template->findAsset($file_path);
        if ($_fp || \AssetsManager\Loader::isUrl($file_path)) {
            return $this->add($file_path, $media, $condition);
        }
        return $this;
    }
public function addIfExists ( $ file_path , $ media = 'screen' , $ condition = null ) { $ _fp = $ this -> __template -> findAsset ( $ file_path ) ; if ( $ _fp || \ AssetsManager \ Loader :: isUrl ( $ file_path ) ) { return $ this -> add ( $ file_path , $ media , $ condition ) ; } return $ this ; }
Add a CSS file in CSS stack if it exists

@param string $file_path The new CSS path
@param string $media The media type for the CSS file (default is "screen")
@param string|null $condition Define a condition (for IE) for this stylesheet
@return self
Add a CSS file in CSS stack if it exists