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Developer Sandbox

ifsetor()
One proposed addition to PHP 6 is the use of a ifsetor function, which helps handle user input from a form, although it can be used for a few other assignments.

MD5 hash comparison
MD5 is probably one of PHP's strongest one-way encryption.

Check validity of an email address
Often with websites that make use of user accounts, they involve an automatic registration form, whereby a user can visit the site and register themselves to use the service.