PHP过滤黑名单关键字的例子

//过滤黑名单关键字函数
function check_($data){
 $keywords = "你是大神吗|你好|去死";
 if(preg_match("/$keywords/i",$data)){
  return;
 }else{
  return $data;
 }
 
}

function Filter_word( $str, $fileName )  
{  
    if ( !($words = file_get_contents( $fileName )) ){  
        die('file read error!');  
    }  
    $str = strtolower($str);
//var_dump($words);
$word = preg_replace("/[1,2,3] | /i", '', $words);
//$wor = substr($word,0,-1);
//$w = preg_replace("|/|i", '/', $word);
//echo "

";

            //var_dump($w);

            //$words = "aaa|bbb|ccc|ddd|eee";

                $matched = preg_replace('/'.$word.'/i', '***', $string);

            return $matched; 

            }   

              

            $content = "我要aaafsdfbbb";   

            if ($result = Filter_word($content, './words.txt') ){

            echo $result;

                echo "替换成功 ";   

            }else{   

                echo "替换失败! ";