memory_limit和memory_get_usage的关系
我先在服务器上测试了下，当/etc/php.ini中memory_limit设置成16M时，memory_get_usage在页面上输出30135641，这时我就纳闷了，那个数字不就是30M么，比php.ini要大啊，怎么没报警。这两者有什么关系？望朋友们解惑！！！
------解决方案--------------------
版主讲得很详细，受教了。
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