Question

I have a folder named files, how do I determine the sum of size of it’s files?

Answer 1

With DirectoryIterator and SplFileInfo

$totalSize = 0;
foreach (new DirectoryIterator('/path/to/dir') as $file) {
    if ($file->isFile()) {
        $totalSize += $file->getSize();
    }
}
echo $totalSize;

and in case you need that including subfolders:

$iterator = new RecursiveIteratorIterator(
    new RecursiveDirectoryIterator('/path/to/dir')
);

$totalSize = 0;
foreach ($iterator as $file) {
    $totalSize += $file->getSize();
}
echo $totalSize;

And you can run $totalSize through the code we gave you to format 6000 to 6k for a more human readable output. You’d have to change all 1000s to 1024 though.