好象在连接数据库后要销毁连接，要销毁结果集，还要销毁对象句柄为啥要这样做
回复讨论(解决方案)
php 程序不是驻留内存的，用完就丢，不可复用
所以他占用的系统资源应该释放
不过 php 内置有垃圾回收机制，你不释放的话，他会替你释放
php 可以不用手动销毁 但是养成一个良好的编程习惯是最重要的！
php 程序不是驻留内存的，用完就丢，不可复用
所以他占用的系统资源应该释放
不过 php 内置有垃圾回收机制，你不释放的话，他会替你释放
即然不驻留内存，即，用完了就没了，那还释放它做啥呢？不是多吃一举吗？
因为数据库是系统资源（不是php自己的）不释放，别人就不能用
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