PHP：在尝试销毁它之前，是否需要检查$ _SESSION是否存在？ [重复]

问题描述：

This question already has an answer here:

Check if var exist before unsetting in PHP? 5 answers

EDIT: Sorry about the title- I meant "before I attempt to unset it".

I want to destroy a specific session cookie, so I do so like:

unset($_SESSION['name']);

...but the user may or may not have that session set. So, should I be checking to see if it exists first, or does unset() take care of that for me without errors?

if (isset($_SESSION['name'])) {

  unset($_SESSION['name']);

}

</div>

此问题已经存在这里有一个答案： p>

在PHP中取消设置之前检查var是否存在？ 5 answers span> li> ul> div>

编辑：对标题感到抱歉 - 我的意思是“在我尝试取消设置之前它是“。 p>

我想销毁一个特定的会话cookie，所以我这样做： p>

  unset（$ _ SESSION ['name  ']）; 
  code>  pre> 
 
  ...但是用户可能会也可能不会设置该会话。 那么，我应该先检查它是否存在，还是 unset（） code>为我做的没有错误？ p> 
 
 
  if（  isset（$ _ SESSION ['name']））{
 
 unset（$ _ SESSION ['name']）; 
 
} 
  code>  pre> 
  div>

答

I think it doesn't matter whether you had to check it.Because whether you check it,the session will be unset and the unset function won't return any error.

PHP：在尝试销毁它之前，是否需要检查$ _SESSION是否存在？ [重复]

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