function replaceSensitiveWords($str, $kstr, $fg = \'|\') {

if (empty($kstr)) {

return $str;

} else {

$keywords = explode($fg, $kstr);

$replacedArr = [];

foreach ($keywords as $keyword) {

$replacedArr[$keyword] = str_repeat(\'*\', mb_strlen($keyword, \'utf-8\'));

}

$replacedStr = strtr($str, $replacedArr);

return $replacedStr;

}

}