Trying to connect to oracle.....newbie

I'm trying to connect to oracle from PHP.

Here is my code:

<?php

$connection = OCIlogon("username","password","tnsentry");

but I keep getting the following error:

"Fatal error: Call to undefined function: ocilogon() in D:\php\test.php on line 3"

Please advise!!!

OS : 2000 Pro
PHP : 4.3.2
Apache/2.0.46 (Win32)

OK...so I uncommented out

;extension=php_oci8.dll in php.ini

I seem to be able to connect. I've modified the code but I still have an error when just trying to return * from table???

The error is
Parse error: parse error, unexpected T_STRING in D:\php\test.php on line 10

The code is

<?php

$conn = ora_login("user","pwd","tnsentry") or die;
$curs = ora_open($conn);

ora_commitoff($conn);

$query = select * from table;

$result=get_query($conn,$query);

for($i=0;$result[$i];$i++){
echo $result[$i][column];
}