传入的$str为获取到的微信昵称,返回值为去除表情后的昵称
protected function emoji_filter($str) {
if($str){
$name = $str;
$name = preg_replace('/\xEE[\x80-\xBF][\x80-\xBF]|\xEF[\x81-\x83][\x80-\xBF]/', '', $name);
$name = preg_replace('/xE0[x80-x9F][x80-xBF]‘.‘|xED[xA0-xBF][x80-xBF]/S','?', $name);
$return = json_decode(preg_replace("#(\\\ud[0-9a-f]{3})#ie","",json_encode($name)));
}else{
$return = '';
}
return $return;
}