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Finding Date and Time Stamp of Page’s Last Update

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Jun 07.2008

Are there any functions (preferably PHP or PERL) or Web services that can determine the date and time a Web page was last updated? I am referring to pages not on my own server, but on another external server. I am interested in writing, or using an already written, routine to check date and time stamps on certain public pages and alert me as to when they get updated.

Thanks.

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@ray326Jun 08.2008 — The HTTP HEAD method will do that as accurately as the server provides.
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@devel95authorJun 08.2008 — Do you have an sample code in PHP? Or can you point me to the PHP function to use? Thanks for your help.
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@ray326Jun 09.2008 — I'm not a phper. In telnet it would be something like:

telnet www.site.com 80

HEAD /index.html HTTP/1.0
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