I upgraded from SQL SERVER 2008 from SQL SERVER 2014.
I am already using SQL SERVER 2008 with PHP. After the upgrade from SQL SERVER 2008 to SQL SERVER 2014 it doesn't seem to be working. It's showing the following error:
[Microsoft][ODBC Driver 11 for SQL Server]SQL Server Network Interfaces: Connection string is not valid 
[Microsoft][ODBC Driver 11 for SQL Server]Login timeout expired
[Microsoft][ODBC Driver 11 for SQL Server]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.