根據(jù)官方文檔：Checks whether the connection to the server is working. If the connection has gone down and auto-reconnect is enabled an attempt to reconnect is made. If the connection is down and auto-reconnect is disabled, mysql_ping() returns an error.也就是說，如果 MYSQL_OPT_RECONNECT 沒有被設(shè)置為 1（開啟），那么mysql_ping()不會(huì)完成自動(dòng)重連，只是簡(jiǎn)單返回一個(gè)error。那么如果已經(jīng)開啟這個(gè)選項(xiàng)了呢？官方文檔又說了：MYSQL_OPT_RECONNECT (argument type: my_bool *)Enable or disable automatic reconnection to the server if the connection is found to have been lost.也就是說，如果發(fā)現(xiàn)連接斷開，那么會(huì)啟動(dòng)自動(dòng)重連功能。現(xiàn)在問題是：連接斷開這事兒是啥時(shí)候被發(fā)現(xiàn)的呢？根據(jù)官方文檔mysql_ping()肯定是會(huì)發(fā)現(xiàn)，那mysql_query()是否會(huì)"發(fā)現(xiàn)"呢？