Memory leaks fixed

[KoudelkaB]

No description provided.

[MartinKoeditz]

@KoudelkaB Do you have an example code for the leak? In that case we can create a unit test.

[KoudelkaB]

The code to reproduce the leak is very simple:
for ($idx = 1; $idx <= 2000; $idx++) {
$h = @ibase_prepare('SELECT * FROM DATASTORE');
$result = ibase_execute($h);
ibase_free_result($result);
ibase_free_query($h);

        unset($h);
        unset($result);

        if ($idx % 100 === 0) {
            echo CONSOLE(
                sprintf(
                    "Queries executed: %d. Memory: %s\n",
                    $idx,
                    Benchmark::getMemoryPeakUsage(true)
                )
            );
        }
    }