PHP 转义emoji表情

• 转码

function userTextEncode($str){
	if(!is_string($str)) return $str;
	if(!$str || $str=='undefined') return '';
	$text = json_encode($str);
	$text = preg_replace_callback("/(\\\u[ed][0-9a-f]{3})/i",function($str){
		return addslashes($str[0]);
	},$text);
	return json_decode($text);
}

• 解码

function userTextDecode($str){
	$text = json_encode($str);
	$text = preg_replace_callback('/\\\\\\\\/i',function($str){
		return '\\';
	},$text);
	return json_decode($text);
}