This is actually in the PHP documentation.

CURLOPT_FILETIME Set value to TRUE to attempt to retrieve the
modification date of the remote document. You can then retrieve this
value using the CURLINFO_FILETIME option with curl_getinfo().

On Nov 1, 2004, at 2:44 AM, Nick Wilson wrote:

> So, im using with PHP - Im downloading a file every 6hrs and want to
> only do this if the file has changed since the last download.

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