detecting spam keywords with stripos
| From: | Merlin Morgenstern | Date: | Fri, 29 May 2009 09:36:13 +0000 |
| Subject: | detecting spam keywords with stripos | ||
| Groups: | php.general | ||
| Request: | Send a blank email to php-general+get-293340@lists.php.net to get a copy of this message | ||
Hi there,
I am matching text against an array of keywords to detect spam. Unfortunatelly there are some false positives due to the fact that stripos also finds the keyword inside a word.
E.G. "Bewerbung" -> "Werbung"
First thought: use strpos, but this does not help in all cases
Second thought: split text into words and use in_array, but this does not find things like "zu Hause" or "flexible/Arbeit"
Does somebody have an idea on how to make my function better in terms of not detecting the string inside a word? Here is the code:
while ($row = db_get_row($result)){
$keyword[] = $row->keyword;
$weight[] = $row->weight;
};
$num_results = db_numrows($result);
for ($i=0;$i<$num_results;$i++){
$findme = $keyword[$i];
$pos = stripos($data[txt], $findme);
$pos2 = stripos($data[title], $findme);
if ($pos !== false OR $pos2 !== false){ // spam!
$spam_level += $weight[$i];
$triggered_keywords .= $keyword[$i].', ';
}
}
$spam[score] += $spam_level;
Thank you for any help!
Merlin