一般情况下：
$str = "hello"; $msg = "你好,$str,world"; var_dump($msg);
一般会输出：
string(16) "你好,hello,world"
如果是这样：
$str = "hello"; $msg = "你好,$str，world"; var_dump($msg);
竟然是这样：
Notice: Undefined variable: str，world in E:\source\test\test.php on line 5 string(5) "你好,"
奇怪吧？,这么改一下就好了!
$str = "hello";
$msg = "你好,{$str}，world";
var_dump($msg);
具体原因不明呀！
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