在cli模式下运行一段时间php就会出现下面的错误，导致网站的整个业务都有影响。然后重启后又可以维持一段时间。
[10-May-2017 01:40:54 UTC] PHP Warning: Error while sending STMT_CLOSE packet. PID=10132 in Unknown on line 0
[11-May-2017 09:55:17 PRC] PHP Fatal error: Uncaught think\exception\ErrorException: Error while sending STMT_CLOSE packet. PID=7628 in F:\wamp\www\rfid\core\library\think\db\Connection.php:323
Stack trace:
#0 F:\wamp\www\rfid\core\library\think\db\Connection.php(323): think\Error::appError(2, 'Error while sen...', 'F:\\wamp\\www\\rfi...', 323, Array)
#1 F:\wamp\www\rfid\core\library\think\db\Connection.php(993): think\db\Connection->free()
#2 [internal function]: think\db\Connection->__destruct()
#3 {main}
thrown in F:\wamp\www\rfid\core\library\think\db\Connection.php on line 323
[11-May-2017 01:55:17 UTC] PHP Warning: Error while sending STMT_CLOSE packet. PID=7628 in Unknown on line 0
[11-May-2017 19:05:24 PRC] PHP Fatal error: Uncaught think\exception\ErrorException: Error while sending STMT_CLOSE packet. PID=6352 in F:\wamp\www\rfid\core\library\think\db\Connection.php:323
Stack trace:
#0 F:\wamp\www\rfid\core\library\think\db\Connection.php(323): think\Error::appError(2, 'Error while sen...', 'F:\\wamp\\www\\rfi...', 323, Array)
#1 F:\wamp\www\rfid\core\library\think\db\Connection.php(993): think\db\Connection->free()
#2 [internal function]: think\db\Connection->__destruct()
#3 {main}
thrown in F:\wamp\www\rfid\core\library\think\db\Connection.php on line 323
[11-May-2017 11:05:24 UTC] PHP Warning: Error while sending STMT_CLOSE packet. PID=6352 in Unknown on line 0
[12-May-2017 10:00:56 PRC] PHP Fatal error: Uncaught think\exception\ErrorException: Error while sending STMT_CLOSE packet. PID=5368 in F:\wamp\www\rfid\core\library\think\db\Connection.php:323
Stack trace:
#0 F:\wamp\www\rfid\core\library\think\db\Connection.php(323): think\Error::appError(2, 'Error while sen...', 'F:\\wamp\\www\\rfi...', 323, Array)
#1 F:\wamp\www\rfid\core\library\think\db\Connection.php(993): think\db\Connection->free()
#2 [internal function]: think\db\Connection->__destruct()
#3 {main}