@DeepDiver1975 We are getting kind of off-topic (which is probably caused by me), but anyway:

```php
$filename = 'filesize.test';

// 80 * 64 MiB = 5 GiB
$chunk = str_repeat("\1", 67108864);
$chunks = 40;

$fp = fopen($filename, 'wb');
while ($chunks)
{
	fwrite($fp, $chunk);
	--$chunks;
}
fclose($fp);

var_dump(filesize($filename));
```
On 64-bit the result is `int(5368709120)`, on 32-bit the output should be `int(1073741824)` (sorry, didn't test).