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How to get the modification time of remote file in php?

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Release： 2016-10-12 10:04:10
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How to get the modification time of remote files in php?

For example http://www.test.com/img/test.png

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How to get the modification time of remote files in php?

For example http://www.test.com/img/test.png

get_headers($url)
Then get Last-Modified

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