GET, POST, REQUEST

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Yesterday when reading some doc on PHP I noticed the $_REQUEST predefined array, which looked like a solution to having to check in GET and POST data (I'm not sure if it will really have an impact on my program yet).

The thing is, I also saw this description:

Variables provided to the script via the GET, POST, and COOKIE input mechanisms, and which therefore cannot be trusted.

Now, why shouldn't it be trusted?

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Lic. Martín Marqués | SELECT 'mmarques' || Centro de Telemática | '@' || 'unl.edu.ar';
Universidad Nacional        |   DBA, Programador,
    del Litoral             |   Administrador
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