problem connecting to an oracle server

[pgutin]

I am very new to this, so the question is simple, can you tell me what is wrong with the following code?
/***************/
testing...
<?php
PutEnv("ORACLE_SID=GL");
PutEnv("ORACLE_HOME=oracle.gl.umbc.edu");
PutEnv("ORACLE_PORT=1521");
$connection = OCILogon ("myUserName", "myPassword");
?>
DONE!
/**************/

DONE! never get's printed, unless i comment $connection... line. I am using all the info that was given to me by the sysAdmin, here's what he said:

/***************/
The server name is "oracle.gl.umbc.edu" on port 1521. The SID is "GL".
/***************/

But it's not working.
Thank you in advance

[Anon]

You might want to check the $connection variable:

if (!$connection)
print Ora_Error($connection);

[pgutin]

It's not even printing an error