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

Question

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']);

}

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Answer 1

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.