How can I filter words out from a HTML form using php?

Question

it would help if the word is contained within the form

for example, filter would find "cycle" in "motorcycle" and block it

Answer 1

You can use replace functions

http://www.php.net/manual/en/function.ereg-replace.php
http://www.php.net/manual/en/function.str-replace.php

these should help.

RJ

Answer 2

Preg_match is the best way...learn about regular expressions as its way to complex to go into here. For instance, if you were making a profanity filter, and someone innocently entered the place name Scunthorpe, you would not want this to be blocked, but it contains what may be seen as a rude word.
I use a program called regex buddy which is good for learning and experimenting with regexes

Answer 3

There are a number of functions in PHP which will do this for you... the easiest one is str_replace --


$string = "This is a test";
echo str_replace(" is", " was", $string);
?>