Doctrine_manual-1-2-en

Chapter 18: Hierarchical Data 281
Examining and Retrieving Siblings
You can easily check if a node has any next or previous siblings by using the following
methods:
// test.php
Listing
18-12
// ...
$hasNextSib = $category->getNode()->hasNextSibling();
$hasPrevSib = $category->getNode()->hasPrevSibling();
You can also retrieve the next or previous siblings if they exist with the following methods:
// test.php
Listing
18-13
// ...
$nextSib = $category->getNode()->getNextSibling();
$prevSib = $category->getNode()->getPrevSibling();
The above methods return false if no next or previous sibling exists.
If you want to retrieve an array of all the siblings you can simply use the getSiblings()
method:
// test.php
Listing
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// ...
$siblings = $category->getNode()->getSiblings();
Examining and Retrieving Descendants
You can check if a node has a parent or children by using the following methods:
// test.php
Listing
18-15
// ...
$hasChildren = $category->getNode()->hasChildren();
$hasParent = $category->getNode()->hasParent();
You can retrieve a nodes first and last child by using the following methods:
// test.php
Listing
18-16
// ...
$firstChild = $category->getNode()->getFirstChild();
$lastChild = $category->getNode()->getLastChild();
Or if you want to retrieve the parent of a node:
// test.php
Listing
18-17
// ...
$parent = $category->getNode()->getParent();
You can get the children of a node by using the following method:
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