Description:
------------
When more than one REF CURSOR is returned in a query, ORA-1000 occurs after some iterations.
Haneef investigated and says:
  "The refcount of the parent statement is incremented by the ref
  cursors in php_oci_define_callback and is not decremented. The
  incrementing is necessary as the parent statement needs to be around
  while fetching the data from the ref cursor. The fix is to decrement
  the refcount of the parent statement before ref cursor is freed."
The fix is being tested.

Reproduce code:
---------------
<?php
$c = oci_connect('hr', 'hrpwd', '//localhost/XE');
for ($x = 0; $x < 400; $x++) {
// more than one CURSOR column causes the problem.
    $sql = "select cursor(select $x from dual) a,
                   cursor(select $x from dual) b
                   from dual";
    
    $sth = oci_parse($c, $sql);
    $r = oci_execute($sth);
    if (!$r) {
        echo "Exiting $x\n"; exit;
    }
    while ($row = oci_fetch_array($sth, OCI_ASSOC)) {
        if ($row) {
            foreach ($row as $k => $v) {
                if (is_resource($v) &&
                    get_resource_type($v) == "oci8 statement") {
                    oci_execute($v);
                    oci_fetch_all($v, $row[$k], 0, -1, OCI_ASSOC);
                    oci_free_statement($v);
                }
            }
        }
        echo $x, "\n";
    }
    oci_free_statement($sth);
}
print "Completed $x\n";
oci_close($c);
?>


Expected result:
----------------
...
398
399
Completed 400

Actual result:
--------------
...
295
296
PHP Warning:  oci_execute(): ORA-00604: error occurred at recursive SQL level 1
ORA-01000: maximum open cursors exceeded in test.php on line 10
Exiting 297