php过滤敏感词

$string ='likeyou小白喜欢小黑爱着的大黄'; //要过滤的内容
$list = ['小明', '小红', '大白', '小白', '小黑', 'me', 'you'];

function sensitive($string,$list){
    $newStr = implode('|',$list);
    $pattern ="/$newStr/i";
    if(preg_match_all($pattern,$string,$matches)){
        $newArr = $matches[0];//匹配成功数组
        $newReplace = array_combine($newArr,array_fill(0,count($newArr),'*'));
        $newStr = strtr($string,$newReplace);
        echo '<pre>';
        var_dump($newReplace);
或者：

$newArr = $matches[0];//匹配成功数组
$pattern = implode('|',$newArr);

$newStr = preg_replace("/$pattern/i",'*',$string);
echo '<pre>';
var_dump($newStr);        

    }
}
sensitive($string,$list);
exit;

$string ='likeyou小白喜欢小黑爱着的大黄'; //要过滤的内容
$list = ['小明', '小红', '大白', '小白', '小黑', 'me', 'you'];

function sensitive($string,$list){
    $newStr = implode('|',$list);
    $pattern ="/$newStr/i";
    if(preg_match_all($pattern,$string,$matches)){
        $newArr = $matches[0];//匹配成功数组
        $a = [];
        $b='';
        foreach($newArr as $v){
            $a[]=str_pad($b,mb_strlen($v,'UTF-8'),'*');
        }
        
        $newReplace = array_combine($newArr,$a);
        $newStr = strtr($string,$newReplace);
        echo '<pre>';
        var_dump($newStr);
        
    }
}

sensitive($string,$list);
exit;