src/Carbon/Language.php
public function getFullIsoName(): string
    {
        if (!$this->isoName) {
            $this->isoName = $this->getNames()['isoName'];
        }

        return $this->isoName;
    }
public function getFullIsoName(): string
    {
        if (!$this->isoName) {
            $this->isoName = $this->getNames()['isoName'];
        }

        return $this->isoName;
    }
public function getFullIsoName ( ) : string { if ( ! $ this -> isoName ) { $ this -> isoName = $ this -> getNames ( ) [ 'isoName' ] ; } return $ this -> isoName ; }
Returns the long ISO language name.

@return string
Returns the long ISO language name .