访问数据库报错

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Fatal error: Undefined class constant 'MYSQL_ATTR_INIT_COMMAND' in /workerman/GatewayWorker/Lib/DbConnection.php on line 1581
WORKER EXIT UNEXPECTED E_ERROR Undefined class constant 'MYSQL_ATTR_INIT_COMMAND' in /workerman/GatewayWorker/Lib/DbConnection.php on line 1581

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