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java scr ipt和XML技术实现。-PHP ajax Tree tree menu, in PHP to quickly implement a list type directory tree menu is very simple and beautiful, widely used in PHP, this menu is based on java scr