<?php
function filtrado($texto, $reemplazo = false)
{
	$filtradas = 'fu?ck, shit'; //Define here your words to censor separated by comma (sorry for the badwords, it's just an example)

	$f = explode(',', $filtradas);
	$f = array_map('trim', $f);
	$filtro = implode('|', $f);

	return ($reemplazo) ? preg_replace("#$filtro#i", $reemplazo, $texto) : preg_match("#$filtro#i", $texto) ;
}
?>

<?php
function filtrado($texto, $reemplazo = false)
{
	$filtradas = 'fu?ck'; //Define here your word to censor

	$f = explode(',', $filtradas);
	$f = array_map('trim', $f);
	$filtro = implode('|', $f);

	return ($reemplazo) ? preg_replace("#$filtro#i", $reemplazo, $texto) : preg_match("#$filtro#i", $texto) ;
}
?>

http://osiux.ws/2008/04/29/filtro-de-palabras-en-php/

This function uses the power of regexp to check if some bad word are on the text, also offers the posibility to change those word for something else. Examples:\r\n\r\n$texto = \'fuck off!\';\r\nfiltrado($texto); returns true since a bad word has been found on the text\r\nfiltrado($texto, \'[censored]\'); //returns [censored] off!\r\n\r\nAnd because regexp, this will work with something like \"fck off!\". You can see a more detailed example here:\r\nhttp://www.otaku-anime.com/varios/filtro.php -- Example\r\nhttp://www.otaku-anime.com/varios/filtro.php?source -- Source code of the example

Censor bad words with regexp

regex, replace

PHP