与TP5框架结合，报这个错误。PHP扩展已经打开，phpinfo中可查看。请问怎么解决
PDOException: could not find driver in /www/wwwroot/henghui/thinkphp/library/think/db/Connection.php:295
Stack trace:
0 /www/wwwroot/henghui/thinkphp/library/think/db/Connection.php(295): PDO->__construct('mysql:host=120....', 'henghui', 'YjRNm7pB7ix3jPK...', Array)
1 /www/wwwroot/henghui/thinkphp/library/think/db/Connection.php(995): think\db\Connection->connect()
2 /www/wwwroot/henghui/thinkphp/library/think/db/Connection.php(348): think\db\Connection->initConnect(false)
3 /www/wwwroot/henghui/thinkphp/library/think/db/connector/Mysql.php(65): think\db\Connection->query('SHOW COLUMNS FR...', Array, false, true)
4 /www/wwwroot/henghui/thinkphp/library/think/db/Query.php(1921): think\db\connector\Mysql->getFields('fa_device')
5 /www/wwwroot/henghui/thinkphp/library/think/db/Query.php(1969): think\db\Query->getTableInfo('fa_device', 'type')
6 /www/wwwroot/henghui/thinkphp/library/think/db/Query.php(1975): think\db\Query->getFieldsType('fa_device')
7 /www/wwwroot/henghui/thinkphp/library/think/db/Builder.php(270): think\db\Query->getFieldsBind('fa_device')
8 /www/wwwroot/henghui/thinkphp/library/think/db/Builder.php(240): think\db\Builder->buildWhere(Array, Array)
9 /www/wwwroot/henghui/thinkphp/library/think/db/Builder.php(719): think\db\Builder->parseWhere(Array, Array)
10 /www/wwwroot/henghui/thinkphp/library/think/db/Query.php(2462): think\db\Builder->select(Array)
11 /www/wwwroot/henghui/thinkphp/library/think/db/Query.php(441): think\db\Query->getPdo()
12 /www/wwwroot/henghui/thinkphp/library/think/db/Query.php(576): think\db\Query->value('COUNT(*) AS tp_...', 0, true)
13 /www/wwwroot/henghui/thinkphp/library/think/db/Query.php(551): think\db\Query->aggregate('COUNT', '*', true)
14 /www/wwwroot/henghui/application/push/controller/Events.php(32): think\db\Query->count()
15 [internal function]: app\push\controller\Events::onMessage('7f00000108fe000...', '{"pak_sn":123,"...')
16 /www/wwwroot/henghui/vendor/workerman/gateway-worker/src/BusinessWorker.php(404): call_user_func('app\push\contro...', '7f00000108fe000...', '{"pak_sn":123,"...')
17 /www/wwwroot/henghui/vendor/workerman/workerman/Connection/TcpConnection.php(656): GatewayWorker\BusinessWorker->onGatewayMessage(Object(Workerman\Connection\AsyncTcpConnection), Array)
18 /www/wwwroot/henghui/vendor/workerman/workerman/Events/Select.php(292): Workerman\Connection\TcpConnection->baseRead(Resource id #155)
19 /www/wwwroot/henghui/vendor/workerman/workerman/Worker.php(2408): Workerman\Events\Select->loop()
20 /www/wwwroot/henghui/vendor/workerman/gateway-worker/src/BusinessWorker.php(197): Workerman\Worker->run()
21 /www/wwwroot/henghui/vendor/workerman/workerman/Worker.php(1541): GatewayWorker\BusinessWorker->run()
22 /www/wwwroot/henghui/vendor/workerman/workerman/Worker.php(1371): Workerman\Worker::forkOneWorkerForLinux(Object(GatewayWorker\BusinessWorker))
23 /www/wwwroot/henghui/vendor/workerman/workerman/Worker.php(1345): Workerman\Worker::forkWorkersForLinux()
24 /www/wwwroot/henghui/vendor/workerman/workerman/Worker.php(546): Workerman\Worker::forkWorkers()
25 /www/wwwroot/henghui/application/push/controller/start/normal/Linuxgate.php(68): Workerman\Worker::runAll()
26 [internal function]: app\push\controller\start\normal\Linuxgate->__construct()
27 /www/wwwroot/henghui/thinkphp/library/think/App.php(359): ReflectionClass->newInstanceArgs(Array)
28 /www/wwwroot/henghui/thinkphp/library/think/Loader.php(479): think\App::invokeClass('app\push\contro...')
29 /www/wwwroot/henghui/thinkphp/library/think/App.php(580): think\Loader::controller('start.normal.li...', 'controller', false, 'Error')
30 /www/wwwroot/henghui/thinkphp/library/think/App.php(456): think\App::module(Array, Array, true)
31 /www/wwwroot/henghui/thinkphp/library/think/App.php(139): think\App::exec(Array, Array)
32 /www/wwwroot/henghui/thinkphp/start.php(19): think\App::run()
33 /www/wwwroot/henghui/linux-port-8090.php(26): require('/www/wwwroot/he...')
34 {main}
Worker[7662] process terminated
worker[DBusinessWorker:7662] exit with status 64000
^CWorkerman[linux-port-8090.php] stopping ...
Workerman[linux-port-8090.php] has been stopped
2919 1 0
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