I'am trying to build a PHP/MySQL/jQuery comment system.  Off late I started to realize that manual spamming is a serious issue that need to be addressed carefully. So I thought of building a PHP function (initially, later can be implemented in OOPS concept) that will sniff the content and give points (spam points) based on some criteria.  Getting a spam point less than will make the content inactive and send for moderation, whereas posts with spam points greater than 2 won't make the content eligible to be inserted in DB. This is a very basic piece of codes, so I want you to give me your valuable suggestion as how to make this code much better and if I am doing something wrong here.<?php #spam points < 2 { will be send for moderation}#spam points > 2 { wont be posted , ie wont be inserted in DB}function sniffSpams($content){    $spam_points    =    0;    $url_pattern    =   '#(www\.|https?://)?[a-z0-9]+\.[a-z0-9]{2,4}\S*#i';    preg_match_all($url_pattern, $content, $matches, PREG_PATTERN_ORDER);    if(! empty($matches))    {        //url is/are present        $get_number_of_urls    =   count($matches[0]);       //get the number of urls/emails present in content        if($get_number_of_urls > 2)            $spam_points += $get_number_of_urls;            //1 point per link        else        {            $spam_words_uri  = array('free', 'vote', 'play');            //if less thamn 2 , check for length of url            foreach ($matches[0] as $url)             {                if(strlen($url) > 150) //long url mostly are spam                   $spam_points += 1;                foreach($spam_words_uri as $spam)                {                    if(stripos($url, $spam) !== false )                         $spam_points += 1;                }            }        }    }   $spam_words  = array('Levitra', 'viagra', 'casino', '*');   foreach($spam_words as $spam)   {        if(stripos($content, $spam) !== false )             $spam_points += 1;   }    return $spam_points;}echo sniffSpams('the * dsjdjsd ');
Spam detection in PHP for comment system
php