public function removeIdentifier($identifier)
    {
        if (isset($this->identifiers[$identifier])) {
            unset($this->identifiers[$identifier]);
        }

        return $this;
    }
public function removeIdentifier($identifier)
    {
        if (isset($this->identifiers[$identifier])) {
            unset($this->identifiers[$identifier]);
        }

        return $this;
    }
public function removeIdentifier ( $ identifier ) { if ( isset ( $ this -> identifiers [ $ identifier ] ) ) { unset ( $ this -> identifiers [ $ identifier ] ) ; } return $ this ; }
Removing a identifier from the list.

@param string $identifier contact identifier

@return self
Removing a identifier from the list .