PHP/ORACLE oci_bind_by_name and RETURNING INTO to get PK

Question

I'm doing a very basic insert into an Oracle DB, with a RETURNING INTO clause to get the primary key. I'm constantly getting a null return though, and I can't figure out for the life of me what the problem might be. Other than this problem, the row inserts perfectly fine. Code below:

$requestParentSQL = "INSERT INTO 
            KRANE_REQUEST (
                DATE_REQUESTED, 
                DATE_EMAILED, 
                PERSON_ID, 
                AUTHORISER_ID
                ) 
            VALUES (
                SYSDATE, 
                SYSDATE, 
                '$theUser', 
                '$theAuthoriser'
                )
            RETURNING 
                KRANE_REQUEST_ID 
            INTO 
                :NEW_KRID";

$oracleConnection = oci_connect(_DATABASEUSERNAME, _DATABASEPASSWORD, _DATABASE);
$oracleStatement = oci_parse($oracleConnection, $requestParentSQL);
oci_bind_by_name($oracleStatement, ':NEW_KRID', $theNewKRID, 8);
oci_execute($oracleStatement, OCI_DEFAULT);
oci_commit($oracleConnection);
oci_free_statement($oracleStatement);
oci_close($oracleConnection);

Answer 1

Problem found. I was calling $theNEWKRID instead of $theNewKRID. My Bad.