php form-input validation

Posted by fusion on Stack Overflow See other posts from Stack Overflow or by fusion
Published on 2010-04-06T17:35:21Z Indexed on 2010/04/06 18:33 UTC
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i have a html page in which i enter data which then submits and inserts in a database on a php page. how would i validate in php that the data received is not a duplicate of the data in the database?

any help appreciated.

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