SQL: 
sqlsrv_errors

Array
(
    [0] => Array
        (
            [0] => 08001
            [SQLSTATE] => 08001
            [1] => 126
            [code] => 126
            [2] => [Microsoft][SQL Server Native Client 10.0]VIA Provider: The specified module could not be found.

            [message] => [Microsoft][SQL Server Native Client 10.0]VIA Provider: The specified module could not be found.

        )

    [1] => Array
        (
            [0] => HYT00
            [SQLSTATE] => HYT00
            [1] => 0
            [code] => 0
            [2] => [Microsoft][SQL Server Native Client 10.0]Login timeout expired
            [message] => [Microsoft][SQL Server Native Client 10.0]Login timeout expired
        )

    [2] => Array
        (
            [0] => 08001
            [SQLSTATE] => 08001
            [1] => 126
            [code] => 126
            [2] => [Microsoft][SQL Server Native Client 10.0]A network-related or instance-specific error has occurred while establishing a connection to SQL Server. Server is not found or not accessible. Check if instance name is correct and if SQL Server is configured to allow remote connections. For more information see SQL Server Books Online.
            [message] => [Microsoft][SQL Server Native Client 10.0]A network-related or instance-specific error has occurred while establishing a connection to SQL Server. Server is not found or not accessible. Check if instance name is correct and if SQL Server is configured to allow remote connections. For more information see SQL Server Books Online.
        )

)