public function makeNodesVisible(array $nodeKeys)
    {
        foreach ($nodeKeys as $nodeKey) {
            if (isset($this->nodes[$nodeKey])) {
                $this->nodes[$nodeKey]->markAsVisible();
            }
        }
    }
public function makeNodesVisible(array $nodeKeys)
    {
        foreach ($nodeKeys as $nodeKey) {
            if (isset($this->nodes[$nodeKey])) {
                $this->nodes[$nodeKey]->markAsVisible();
            }
        }
    }
public function makeNodesVisible ( array $ nodeKeys ) { foreach ( $ nodeKeys as $ nodeKey ) { if ( isset ( $ this -> nodes [ $ nodeKey ] ) ) { $ this -> nodes [ $ nodeKey ] -> markAsVisible ( ) ; } } }
Makes nodes in the tree visible.

@param string[] $nodeKeys
the keys of the visible nodes, may be empty

@return void
Makes nodes in the tree visible .