how to detect type of image

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Hi,

In my web application, end user is able to load images (png, jpeg, gif,..)
into database.
I would like to know how can i detect automatically the type of image (pnd,
jpeg,...) ?
i do not want to check the extension because this is easily faked... just by
renaming it.

Does it exist a technique for that ?

thanks a lot,

--
Alain
------------------------------------
Windows XP SP2
PostgreSQL 8.1.4
Apache 2.0.58
PHP 5

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