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//...
//use below to specify additional options passed to PDO:
$config['PDO.options']=[
    PDO::MYSQL_ATTR_SSL_KEY    				=>'/etc/mysql/ssl/client-key.pem',
    PDO::MYSQL_ATTR_SSL_CERT				=>'/etc/mysql/ssl/client-cert.pem',
    PDO::MYSQL_ATTR_SSL_CA    				=>'/etc/mysql/ssl/ca-cert.pem',
  //PDO::MYSQL_ATTR_SSL_VERIFY_SERVER_CERT	=> false							//to disable server cert verification
];