Temporary

use Innmind\IO\IO;
use Innmind\Immutable\{
    Sequence,
    Str,
};

$temporary = IO::fromAmbientAuthority()
    ->files()
    ->temporary(Sequence::of(
        Str::of('chunk 1'),
        Str::of("new line \n"),
        Str::of('chunk 2'),
        Str::of('etc...'),
    ))
    ->unwrap();

This creates a temporary file without having to think about where to store it.

You can then use it in 2 ways:

Like a normal fileChunk by chunk

$temporary
    ->read()
    ->chunks(8192);
// or
$temporary
    ->read()
    ->lines();

$pull = $temporary->pull();

do {
    $chunk = $pull
        ->chunk(512)
        ->unwrap();
    doSomething($chunk);
} while (!$chunk->empty());

The call to ->chunk() is stateful as it remembers the position in the file. This means that you can only read forward, and only once.