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Cleaning Form Data (Validation)


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Hey everyone!

I'm trying to find the best way to clean some incoming POSTed data (to protect me from the bad guys of course), and was wondering if htmlentities is doing anything useful for me if I'm just going to strip the incoming data of everything except letters and numbers anyway.


Question #1: Can the htmlentities line be removed without affecting security in any way?


Question #2: Is using preg_replace like this an effective way to secure my website from this incoming data?



$name_dirty = htmlentities($_POST['name'], ENT_QUOTES);

$name_cleaned = preg_replace('#[^A-Za-z]#i', '', $name_dirty);



Thank you Developer-Guru's! :)

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