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Warning: PDO::__construct(): MySQL server has gone away in?E:\xampp\htdocs\ceshi\mvc\model\Db3.php?on line?74

Warning: PDO::__construct(): Error while reading greeting packet. PID=11512 in?E:\xampp\htdocs\ceshi\mvc\model\Db3.php?on line?74

Warning: Uncaught exception 'PDOException' with message 'SQLSTATE[HY000] [2006] MySQL server has gone away' in E:\xampp\htdocs\ceshi\mvc\model\Db3.php:74 Stack trace: #0 E:\xampp\htdocs\ceshi\mvc\model\Db3.php(74): PDO->__construct('mysql:host=127....', 'root', '') #1 E:\xampp\htdocs\ceshi\mvc\model\Db3.php(39): Db->connect() #2 E:\xampp\htdocs\ceshi\mvc\model\Db3.php(57): Db->__construct(Array) #3 E:\xampp\htdocs\ceshi\mvc\demo.php(11): Db::getInstance() #4 {main} thrown in?E:\xampp\htdocs\ceshi\mvc\model\Db3.php?on line?74

Fatal error: Maximum execution time of 30 seconds exceeded in?E:\xampp\htdocs\ceshi\mvc\model\Db3.php?on line?74