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use League\Flysystem\InMemory\InMemoryFilesystemAdapter;

$adapter = new InMemoryFilesystemAdapter();

<?php
include( dirname( __DIR__ ) . '/vendor/autoload.php' );


use League\Flysystem\Filesystem;
use League\Flysystem\InMemory\InMemoryFilesystemAdapter;

$adapter = new InMemoryFilesystemAdapter();
$filesystem = new Filesystem($adapter);

/**
 * 2. Register the filesystem with Flystream and associate it with a
 *    custom protocol (e.g. 'mem').
 */

use Elazar\Flystream\FilesystemRegistry;
use Elazar\Flystream\ServiceLocator;

$registry = ServiceLocator::get(FilesystemRegistry::class);
$registry->register('mem', $filesystem);

/**
 * 3. Interact with the filesystem instance using the custom protocol.
 */

mkdir('mem://foo');

$file = fopen('mem://foo/bar', 'w');
fwrite($file, 'baz');
fclose($file);

file_put_contents('mem://foo/bar', 'bay');

$contents = file_get_contents('mem://foo/bar');
// or
$contents = stream_get_contents('mem://foo/bar');

if (file_exists('mem://foo/bar')) {
    rename('mem://foo/bar', 'mem://foo/baz');
    touch('mem://foo/bar');
}

$file = fopen('mem://foo/baz', 'r');
fseek($file, 2);
$position = ftell($file);
ftruncate($file, 0);
fclose($file);

$dir = opendir('mem://foo');
while (($entry = readdir($dir)) !== false) {
    echo $entry, PHP_EOL;
}
closedir($dir);

unlink('mem://foo/bar');
unlink('mem://foo/baz');

rmdir('mem://foo');

// These won't have any effect because Flysystem doesn't support them.
chmod('mem://foo', 0755);
chown('mem://foo', 'root');
chgrp('mem://foo', 'root');

/**
 * 4. Optionally, unregister the filesystem with Flystream.
 */
$registry->unregister('mem');