public function getContentExtensions()
    {
        if (!empty($this->validExtensions)) {
            return $this->validExtensions;
        }

        return $this->validExtensions = $this->getContentTypeHandler()->getContentExtensions();
    }
public function getContentExtensions()
    {
        if (!empty($this->validExtensions)) {
            return $this->validExtensions;
        }

        return $this->validExtensions = $this->getContentTypeHandler()->getContentExtensions();
    }
public function getContentExtensions ( ) { if ( ! empty ( $ this -> validExtensions ) ) { return $ this -> validExtensions ; } return $ this -> validExtensions = $ this -> getContentTypeHandler ( ) -> getContentExtensions ( ) ; }
Get all content file extensions

@return string[]
Get all content file extensions