Create php树形结构数组的高效算法.php

http://www.dewen.org/q/3461/%E5%B0%86%E6%95%B0%E6%8D%AE%E5%BA%93%E6%95%B0%E6%8D%AE%E8%BD%AC%E5%8C%96%E6%88%90php%E6%A0%91%E5%BD%A2%E7%BB%93%E6%9E%84%E6%95%B0%E7%BB%84%E7%9A%84%E9%AB%98%E6%95%88%E7%AE%97%E6%B3%95