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#1
December 20th, 2002, 05:18 AM
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bad language screener
Hello,
I've developed a forums board using PHP and MySql, and I would like to add a bad language screener to it, meaning, every written messaged is scanned, and if it contains a word from a list of forbidden words the message is not to be posted. Maybe one of you wrote something like this and can give me tips? Thanx, Gino.
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#2
December 20th, 2002, 07:28 AM
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1. Create bad words table
2. When somebody add message use eregi_replace function - all words one by one Sincerely, Sergey Booyny AlarIT programmer http://www.AlarIT.com
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#4
December 20th, 2002, 06:58 PM
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Quote:
eregi_replace() is inefficient for this. Use preg_replace() instead - much faster. Here is your code -> Code:
/*************************************
Function to generate a random muff string
*************************************/
function create_string( $length ) {
mt_srand( ( double )microtime() * 1000000 );
$possible = '!@#$%^&*-';
$replace = false;
while( strlen( $replace ) < $length ) {
$replace .= substr( $possible, mt_rand( 0, strlen( $possible ) -1 ), 1 );
}
return( $replace );
}
/*************************************
The code to do the replacment
*************************************/
$string = $your_data_with_words;
foreach ( $your_array_of_words as $val )
{
$string = preg_replace( "/\b$word\b/i", create_string( strlen( $val ) ), $string );
}
echo $string;
/*************************************
$your_data_with_words -> The scalar with the data
$your_array_of_words -> The array of bad words to filter from your DB
*************************************/
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#5
December 21st, 2002, 01:49 AM
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Thank you very much for your detailed answer.
How do I keep my array of bad words? Just loop it from the DB or something else? is preg_replace not case sensitive? Last edited by lord_gino : December 21st, 2002 at 02:22 AM.
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#6
December 21st, 2002, 10:44 AM
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Quote:
Ok, you can keep your words in a DB or even a flat file. If you have a field in your DB with the words, you can use a while() to fetch the array, as so -> PHP Code:
With the above, you will replace the foreach() in the original code chunk I posted with the above. So you would put the preg_replace() code where the note is above in the while loop. Now, you can have the words in a flat file also. The file layout would like like this -> Code:
badword verybadword word thisbadword To get your array out of the file, use this -> PHP Code:
That will create the array of words for you. Then you would use the foreach() loop as posted in the original chunk of code I posted. Quote:
/\b$word\b/i - the i tells it to be case insensative.
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