Windows, Oracle XE & PHP

Question

I have the following code failing to connect to my database even though I can access that database using sqldeveloper as well as apex(http://localhost:8080/apex/)
<?php
    $SGMDBUsername            = "big";
    $SGMDBPassword            = "big";
    $SGMDBName                = "s7s";
// ORACLE_HOME=C:\oraclexe\app\oracle\product\10.2.0\server
//    $conn=oci_connect($SGMDBUsername, $SGMDBPassword, $SGMDBName);
    // The above gives ORA-12514: TNS:listener does not currently know of service requested in connect descriptor
//    $conn=oci_connect($SGMDBUsername, $SGMDBPassword);
    // The above gives ORA-12560: TNS:protocol adapter error
//    $conn = oci_connect($SGMDBUsername, $SGMDBPassword, 'localhost/'.$SGMDBName);
    // The above gives ORA-12514: TNS:listener does not currently know of service requested in connect descriptor
    $conn = oci_connect($SGMDBUsername, $SGMDBPassword, '127.0.0.1/'.$SGMDBName);
    // The above gives ORA-12514: TNS:listener does not currently know of service requested in connect descriptor
    if ( ! $conn )
        $e = oci_error();  // For oci_connect errors pass no handle
//        echo 'Unable to OCILogon to database. '.$e['message'];
        echo $e['message'];
        die();
    echo "Connected!";
?>As you can see I have attempted various ways to connect and have listed the error messages I get from each within the code.
Please tell me how to fix this.

Answer 1

Okay, now what's the value of the SERVICE_NAMES parameter in the database?
Some more information:
//    $conn=oci_connect($SGMDBUsername, $SGMDBPassword, $SGMDBName);
    // The above gives ORA-12514: TNS:listener does not currently know of service requested in connect descriptorYou'll get this error if the SERVICE_NAME in your TNSNAMES.ORA file doesn't match that of the database parameter.
//    $conn=oci_connect($SGMDBUsername, $SGMDBPassword);
    // The above gives ORA-12560: TNS:protocol adapter errorThis uses Oracle's bequeath protocol and only works if the client and server exist on the same machine. If it does, then you are missing additional information like an ORACLE_SID environment variable.
//    $conn = oci_connect($SGMDBUsername, $SGMDBPassword, 'localhost/'.$SGMDBName);
    // The above gives ORA-12514: TNS:listener does not currently know of service requested in connect descriptor
    $conn = oci_connect($SGMDBUsername, $SGMDBPassword, '127.0.0.1/'.$SGMDBName);
    // The above gives ORA-12514: TNS:listener does not currently know of service requested in connect descriptorFor these two you need to enable EZCONNECT by setting the correct value in your SQLNET.AUTHENTICATION_SERVICES parameter in your SQLNET.ORA file. Also your string you passed is not correct either. It should be:
//host:port/service_nameor
host:port/service_name