How to obtain programatically using PHP the file size before downloading it?

Hi Experts!

How to  programatically  obtain by using PHP the file size before downloading it?

Thanks in advance.
Eduardo FuerteDeveloper and AnalystAsked:
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Ray PaseurCommented:
http://php.net/manual/en/function.clearstatcache.php
http://php.net/manual/en/function.filesize.php

Be aware of the 2GB effect on 32-bit systems (documented in the man pages).
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