$ cvs diff oci_statement.c
Index: oci_statement.c
===================================================================
RCS file: /repository/php-src/ext/pdo_oci/oci_statement.c,v
retrieving revision 1.20
diff -r1.20 oci_statement.c
420a421,424
> #ifdef SQLT_TIMESTAMP_LTZ
>                     || dtype == SQLT_TIMESTAMP_LTZ
> #endif
>

Thanks for posting the patch again.
Actually I asked you to provide a small piece of PHP code I can use to test the problem you are trying to fix.

1. Create a table in Oracle that used the "timestamp(0) with local time zone" type:

   SQL> create table ltz_test(aa timestamp(0) with local time zone not null) ;

2. Insert a row into ltz_test:

   SQL> insert into ltz_test values(current_timestamp);

3. Using PDO, read the table:

<?php
    $dbh = new PDO('oci:', 'username', 'hello');
    $dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    $dbh->setAttribute(PDO::ATTR_CASE, PDO::CASE_LOWER);
    $sth = $dbh->prepare('select aa from ltz_test');
    $sth->execute();
    $r = $sth->fetch();
    print $r[0] . "\n";
?>

The following error is produced:

Warning: PDOStatement::fetch(): column 0 data was too large for buffer and was truncated to fit it in ltz_test.php on line 7

This is still broken in php version 5.3.5; The fix is a really simple patch. The oci8 even has the fix, but the pdo_oci still does not.