Solution to PHP connection mysql timeout

function reconnect(){
 if (!mysql_ping ($this->db)) {
 //here is the major trick, you have to close the connection (even though it is not currently working) for it to recreate properly. Mysql_close($this->db);
 $this->connect(); has been disconnected If it is open, if it is disconnected, close the current link and re-create a new connection.

In this way, as long as the connection is found to be disconnected, it can be reconnected.