A PHP class tree (support for infinite classification)

Recently asked infinite classification of tree-like problems more, so a happy to write a, I just finished, we use to see, see how to achieve faster, simpler, put your tree also posted out (to query only once database) <br>
　　
This is a categorized list of class trees that support infinite classification <br>
A category can have both "categories that contain subclasses" and "final Classification";<br>
　　


The only advantage is * * * * * * * * only need to do a database * * * Query .<br>
　　
Not very good-looking, but you can customize the changes, you can define your own CSS plus inside <br>
　　
The cache has not been done, you can make up your own
　　
The directory structure of the following example is this.
¦--catagory.php <br>
¦--images----tree.jsp <br>
¦--images----Treeopen.gif <br>
¦--images----Treeclose.gif <br>
¦--images----Line.gif <br>
　　
/****************tree.jsp********************/
function expand (ID) {
node = document.all (' node ' +id);
if (node.style.display== ') {
Node.style.display = ' None ';
Document.images (' img ' +id). src = imgopen;
}else{
Node.style.display = ';
Document.images (' img ' +id). src = imgclose;
}
}
　　
/****************catagory.php********************/
<?php
　　
Define (' Catagory_tree_expend_none ', 0);
Define (' Catagory_tree_expend_all ', 1);
　　
Class catagory{
Basic classification data
var $treeData = array ();
The hierarchical array of classifications, with the ID value of the category as the keyword for the array
var $treePList = array ();
The relationship of self-classification corresponding to superior class
var $treeCList = array ();
/*
* This is a template for large categories
*
* Number of __id__ categories
* Name of the __name__ category
* __image__ Category The image name shown earlier $imgOpen or $imgClose
* Whether the __OPEN__ classification is currently expanded
* __inner__ the position displayed by the sub category