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php whitelist form validation??
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Hi!!!
I need to check a form for illegal characters through a whitelist(list of allowed characters) with php. A function that could do this for me would be helpful...I can't find one on google...
I really have no idea how to do this....
thanks!!!!
~Kodiak
I need to check a form for illegal characters through a whitelist(list of allowed characters) with php. A function that could do this for me would be helpful...I can't find one on google...
I really have no idea how to do this....
thanks!!!!
~Kodiak
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Last edited by stymiee; Jul 17th, 2007 at 6:53 pm.
John Conde
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If the whitelist is entirely comprised of single characters, you can probably use to replace any occurrence of "#","$",or "%" with an empty string. Just put whatever characters you need to strip in there. If it's not a simple single character situation (i.e. you need to strip something like "<p>") then you'll have to go deeper into regex land to get there.
PHP Syntax (Toggle Plain Text)
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Originally Posted by Ezzaral 
If the whitelist is entirely comprised of single characters, you can probably useto replace any occurrence of "#","$",or "%" with an empty string. Just put whatever characters you need to strip in there. If it's not a simple single character situation (i.e. you need to strip something like "<p>") then you'll have to go deeper into regex land to get there.PHP Syntax (Toggle Plain Text)
PHP Syntax (Toggle Plain Text)
isn't there a way to make characters that are allowed(whitelist)
instead of characters that aren't allowed(blacklist)??
instead of characters that aren't allowed(blacklist)??
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Sure, you can regular expressions to look for anything you want.
John Conde
Brainyminds | Merchant Account Services | I Love Code
IT'S HERE: Merchant Accounts 101 Everything you need to know about merchant accounts!
Brainyminds | Merchant Account Services | I Love Code
IT'S HERE: Merchant Accounts 101 Everything you need to know about merchant accounts!
php Syntax (Toggle Plain Text)
replacing everything that is not char. or digit with whitespace
programming is an art ,only for those who can understand it.
- th3 php wr3nch -
- th3 php wr3nch -
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Originally Posted by w_3rabi
i guess this could work for your casephp Syntax (Toggle Plain Text)
replacing everything that is not char. or digit with whitespace
well what u did was the black list thing
and what i did is white one
it may look the same
but it is not!
and what i did is white one
it may look the same
but it is not!
programming is an art ,only for those who can understand it.
- th3 php wr3nch -
- th3 php wr3nch -
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Originally Posted by w_3rabi
well what u did was the black list thing
and what i did is white one
it may look the same
but it is not!
Anyway, it does not matter. I posted to support that what you posted should work for him, he just needs to tune the pattern to include his acceptable characters
Last edited by Ezzaral; Jul 18th, 2007 at 1:19 pm.
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