敏感词过滤方法(PHP)

$badword = array(
'张三','张三丰','张三丰田'
);
$badword1 = array_combine($badword,array_fill(0,count($badword),'*'));
$bb = '我今天开着张三丰田上班';
$str = strtr($bb, $badword1);
echo $str;

$hei=array(
'中国',
'日本'
);
$blacklist="/".implode("|",$hei)."/i";
$str="中国一是一个很好的国家";
if(preg_match($blacklist, $str, $matches)){
print "found:". $matches[0];
} else {
print "not found.";
}