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php isset函数和empty函数学习
- WBOYOriginal
- 2016-06-20 12:44:58913browse
isset ：在php中如果变量被赋值为NULL，则表明变量被销毁掉了，所以如果变量为NULL时，isset为false，当然变量没有定义时isset也返回false，其他情况都返回true
empty：变量为0，NULL，不存在，“”，array(),等有空概念的的时候，就返回true，否则返回false
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