src/Traits/Strings/IsicV4Trait.php
public function getIsicV4() : ?string 
    {
        if ( ! $this->hasIsicV4()) {
            $this->setIsicV4($this->getDefaultIsicV4());
        }
        return $this->isicV4;
    }
public function getIsicV4() : ?string 
    {
        if ( ! $this->hasIsicV4()) {
            $this->setIsicV4($this->getDefaultIsicV4());
        }
        return $this->isicV4;
    }
public function getIsicV4 ( ) : ? string { if ( ! $ this -> hasIsicV4 ( ) ) { $ this -> setIsicV4 ( $ this -> getDefaultIsicV4 ( ) ) ; } return $ this -> isicV4 ; }
Get isic v4

If no "isic v4" value has been set, this method will
set and return a default "isic v4" value,
if any such value is available

@see getDefaultIsicV4()

@return string|null isic v4 or null if no isic v4 has been set
Get isic v4