PHP引用的一个问题
网上看到这么一句话
如果对一个未定义的变量进行引用赋值、引用参数传递或引用返回，则会自动创建该变量。并且指向NULL
经常用 isset 来判断一个值是否存在，如果直接输出某个不存在的值会报错。
但如果我用引用的方式，是否可以替代isset，是否会印象性能
$id=&$_GET['id']
这样$_GET['id']不存在也不会报错，存在了，就引用给变量 $id
回复讨论(解决方案)
$id =& $_GET['id'];
和
$id = @$_GET['id'];
对 $id 而言是等效的
但 $id =& $_GET['id']; 后
对 $id 的任何修改都会影响到 $_GET['id']，这样就可能会使程序的其他使用 $_GET['id'] 的部分出问题
如果仅仅是为了回避 Notice 级别错误，大可不必这样做
判别传入参数是否正确是很有必要的，尤其是单入口系统，传入的参数会影响整个工作流程
没有其他不同的看法吗
看来得结贴了
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