How to read cookie expiry time in PHP [duplicate]

This question already has answers here: 开发者_开发知识库 Closed 11 years ago.

Possible Duplicate:

How to get cookie's expire time

Hi, How can i read cookie expiry time in PHP

Thanks.

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You can't, unless you store it elsewhere with your own mechanisms. Epxiry is a write-only field for cookies. Only the name and value of a cookie can be read once set. If the cookie is readable, it's not expired--that's all you get to know about that.

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You cannot read the cookie expiry time, because browsers do not send it to your server, only the value of cookies. Browsers send cookies back to the server in a HTTP header like this;

Cookie: cookieName=cookieValue

The most common method of preventing cookies from expiring is setting an expiry date way in the future.