PHP ajax Tree树形菜单，在PHP中快速实现一个目录列表类型的树形菜单，十分简洁漂亮，在PHP中应用广泛，本菜单基于Javascr ipt和 XML技术实现。-PHP ajax Tree tree menu, PHP in the rapid realization of a directory list type tree menu, very simple and beautiful, widely used in PHP, the menu is based on Javascr