SQL ERROR in PHP code

[Anon]

Warning: SQL error: [Microsoft][ODBC drivers ...] DataSource not found and driver name not specified, SQL state IM002 in SQLConnect in ...

I use PHP4 and the problem is in this line code :

$dsn_name="TEST_UNIV";
$dsn_user="";
$dsn_pwd="";
$id_conn=odbc_pconnect('$dsn_name','$dsn_user', '$dsn_pwd',SQL_CUR_USE_ODBC);

COULD SOMEONE EXPLAIN ME THE ERROR

[Anon]

I've just found the solution.

I just had to type this :
$id_conn=odbc_pconnect("$dsn_name","$dsn_user","$dsn_pwd","SQL_CUR_USE_ODBC");