Ask php how to quickly determine whether a large number of remote files exist

Could you tell me php how to quickly determine whether a large number of remote files exist remote file is a jump such as header ("Location: & nbsp; http://www.baidu.com"); each get, may be the same, it may vary by hour or hour. each time we need to judge about objects, I was thinking about using get_h. how can php quickly determine whether a large number of remote files exist?
Remote File is a jump

For example

Header ("Location: http://www.baidu.com ");

Each time it is obtained, it may be the same, it may be different

Judge every hour. you need to judge about items each time.

What I was thinking was to use the get_header function for determination, but it was found that the efficiency was not high.

Could you tell me any good way to share with PHP:
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Curl_multi