How do I do form validation with PHP?

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Relevant threads:

bad stuff - email and string validation.

Validating emails

PHP help please...

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Relevant FAQs:

How do I do form validation with JavaScript?

How do I do form validation with Perl?

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Relevant notes:

As of the time of writing this FAQ was ranked 8 at Google for the terms php, form, validation

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Emperor

(Added by: Emperor on Sat 14-Sep-2002)

(Edited by: Emperor on Mon 04-Nov-2002)