非法词屏蔽

<?php
class Text_Filter
{
    var $words;  //文字
    function Text_Filter()
    {
        $this->words=NULL;
    }
    
    function wordsFilter(&$message=null, &$matche_row=array())
    {
        //$matche_row 非法词组
        if(empty($this->words))
        {
            global $config;
            @include_once($config['webroot'].'/config/filter.inc.php');
            $this->words =& $_CACHE['word_filter'];
        }
        else
        {
            
        }

        $message = empty($this->words['filter']) ? $message : @preg_replace($this->words['filter']['find'], $this->words['filter']['replace'], $message);

        if($this->words['banned'] && preg_match($this->words['banned'], $message, $matche_row))
        {
            echo "<div align='center'>Content contains illegal characters.<br>";
            foreach($matche_row as $v)
            {
                echo $v.',';
            }
            echo "<br> <a href='javascript:history.back();' > Back </a> </div>";
            die;//有非法词
        }
        else
        {
            return $message;//被替换后的信息
        }
    }
}
?>