PDOException SQL Server in Laravel 5.2 after update to PHP 5.6

I'm working on a system with Laravel 5.2 and I connect it to SQL Server with no problems, until I upgraded from PHP 5.4 to PHP 5.6, and now when I try to login it's throwing me the next exception:

PDOException in Connector.php line 55: SQLSTATE[HY000] Unable to connect: Adaptive Server is unavailable or does not exist (severity 9)

Is there another configuration I have to do, or library I have to update or install? I think it may be pdolib, but I haven't found information that can help me.

I'll really appreciate your help.

via Chebli Mohamed