Php method to generate a category tree array through the category list

This article describes how to generate a classification tree array by using the classification list in php. it involves some skills related to php operations on arrays and classification nodes, and has some reference value, for more information, see the following example. Share it with you for your reference. The specific analysis is as follows:

Here, $ list is the category list array, the key is the category ID, the value is the category node object, and the pid is the parent category ID.

The php code is as follows:

$ Tree = array (); foreach ($ list as $ id => $ row) {$ pid = $ row-> pid; if ($ pid = 0) {$ tree [] = & $ list [$ id];} else if (isset ($ list [$ pid]) {$ parent = & $ list [$ pid]; $ parent-> children [] = & $ list [$ id]; // add the children attribute to identify the subcategory list }}

I hope this article will help you with php programming.