sql server - Ubuntu PHP and sqlsrv

i'm using class uses sqlsrv_connect() in php connect mssql database server, error:

fatal error: call undefined function sqlsrv_connect()

i’ve done multiple install methods such as:

sudo apt-get install -y freetds-bin freetds-common tdsodbc odbcinst unixodbc php5-sybase

restarted apache none of them seem solve problem of libraries being added. can give guidance on problem?

i'm using:

php 5.3.10-1ubuntu3.1 suhosin-patch (cli) (built: may  4 2012 02:20:36)

linux based php not support sqlsrv_* functions. provided windows driver. freetds provide access old mssql_* functions.

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