//敏感词替换

$badword = ['中国教徒','统一教','反动派'];
$badword1 = array_combine($badword,array_fill(0,count($badword),'***'));
$bb = '我不是中国教徒，这个不是反动派';
$str = strtr($bb, $badword1);
echo $str;

//敏感词变色

$words = ['fuck','no'];
$wordsred = ['<span style='color:red'>fuck</span>','<span style='color:red'>no</span>'];
$success = array_combine($words,$wordsred);
strtr(‘fuckyou’, $success);