php empty和isset的比较

1:isset()函数 一般用来检测变量是否设置

2::empty()函数 判断值为否为空

注: empty() 只检测变量，检测任何非变量的东西都将导致解析错误。换句话说，后边的语句将不会起作用： empty(addslashes($name))。

例子：

<?php $empty_object=(object)array();$null_str=array(0,'','0',NULL,array(),FALSE,TRUE,$empty_object);foreach ($null_str as $k=>$v){    if(empty($v)){       echo $k." is  empty<br />";    }    if(isset($v)){        echo $k." is isset<br />";    }}

运行结果:

0 is empty
0 is isset
1 is empty
1 is isset
2 is empty
2 is isset
3 is empty
4 is empty
4 is isset
5 is empty
5 is isset
6 is isset
7 is isset