e107inc/e107

<?php


/**
 *
 */
class e_profanity
{

    protected $profanityList;
    private $pref;

    public function __construct()
    {

        $this->pref = e107::getPref();

        if(empty($this->pref['profanity_words']))
        {
            return null;
        }

        $words = explode(',', $this->pref['profanity_words']);
        $word_array = array();
        foreach($words as $word)
        {
            $word = trim($word);
            if($word != '')
            {
                $word_array[] = $word;
                if(strpos($word, '&#036;') !== false)
                {
                    $word_array[] = str_replace('&#036;', '\$', $word);        // Special case - '$' may be 'in clear' or as entity
                }
            }
        }
        if(count($word_array))
        {
            $this->profanityList = str_replace('#', '\#', implode("\b|\b", $word_array));        // We can get entities in the string - confuse the regex delimiters
        }
        unset($words);

        return true;
    }

    /**
     * @param $text
     * @return string|string[]|null
     */
    public function filterProfanities($text)
    {

        if(empty($this->profanityList))
        {
            return $text;
        }

        if(!empty($this->pref['profanity_replace']))
        {
            return preg_replace("#\b" . $this->profanityList . "\b#is", $this->pref['profanity_replace'], $text);
        }

        return preg_replace_callback("#\b" . $this->profanityList . "\b#is", array($this, 'replaceProfanities'), $text);
    }

    /**
     *
     * @param $matches
     * @return string|string[]|null
     */
    public function replaceProfanities($matches)
    {

        /*!
        @function replaceProfanities callback
        @abstract replaces vowels in profanity words with stars
        @param text string - text string to be filtered
        @result filtered text
        */

        return preg_replace('#a|e|i|o|u#i', '*', $matches[0]);
    }
}