/**
* Add a child node to the current node.
*
* Notifies the child of its parent and adds the child name to
* the child name array. Does not enforce unique names since it
* may be desireable to have non-unique named children. It's on
* the developer to not rely on the get() method in that case
*
* @return void
*/
public function add(EE_TreeNode $child)
{
if ($child == $this) {
throw new RuntimeException('Cannot add tree node to itself.');
}
if ($this->_frozen) {
throw new RuntimeException('Cannot add child. Tree node is frozen.');
}
$this->children[] = $child;
$this->children_names[$child->name] = $child;
$child->_set_parent($this);
}
