[FATAL_ERROR] Uncaught PDOException: There is already an active transaction 。。。
$mysql->beginTransaction();
出现这个错误就是事务嵌套了。意思就是本来一段代码中已经开启了事务处理， 然后在这段代码中又写多了一个事务，同时开启了两个事务处理就会冲突。
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