[PHP5]Attribut affecté avec le retour d'une fonction statique

// Attributes
private static $contact_elements_txt = Functions::getString('strElementsContactText');

public static function getString($param)
{
return $GLOBALS[$param] ;
}

$GLOBALS['strElementsContactText'] = array('Nom', 'Prénom', 'Age', 'N°', 'Rue', 'Code postal', 'Ville', 'Société', 'Travail') ;

Parse error: syntax error, unexpected '(', expecting ',' or ';' in C:\wamp\www\managment_contact\php\Contact.php on line 5

// Builder
public function __construct($name, $firstName, $age, $adressNumber, $adressText, $postalcode, $town, $firm, $work)
{
$this->name = $name ;
$this->firstname = $firstName ;
$this->age = $age ;
$this->adressNumber = $adressNumber ;
$this->adressText = $adressText ;
$this->postalCode = $postalcode ;
$this->town = $town ;
$this->firm = $firm ;
$this->work = $work ;
$contact_elements_txt = Functions::getString('strElementsContactText');
}

// Attributes
private static $contact_elements_txt = Functions::getString('strContactElementsTxt') ;
private static $contact_elements_id = array('name', 'firstname', 'age', 'adress_number', 'adress_text', 'postal_code', 'town', 'firm', 'work') ;
private $name, $firstname, $age, $adressNumber, $adressText, $postalCode, $town, $firm, $work, $id ;