How does PHP connect to the SQL Server database?

How PHP connects to the SQL Server database
I'm just starting to touch PHP and do the database connection section. Almost a lot of tutorials are MySQL, I now want to connect to the SQL Server database, how to connect it. I have configured the configuration method found on the Internet. However, my installation directory does not ntwdblib.dll this file.
The code is as follows:
$conn = @mssql_connect ("localhost", "Zhengjie", "123") or Die ("Connection Error! ");
mssql_select_db ("Student Information management");
if ($conn)
{
echo "Connection is successful! ";
}
?>
No prompt after running ... Ask for help ... Thank you

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------Solution--------------------
You use
Mysql_error ()
Check the error message.

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