Save and load images

<?php

require __DIR__ . '/vendor/autoload.php';

use Docker\API\Endpoint\ImageLoad;
use Docker\Docker;

$docker = Docker::create();
$archive = fopen(__DIR__ . '/saved-image.tar', 'rb');
if ($archive === false) {
    throw new RuntimeException('Could not open the image archive');
}
$body = null;
try {
    $response = $docker->executeRawEndpoint(new ImageLoad($archive, ['quiet' => true]));
    $body = $response->getBody();
    if ($response->getStatusCode() !== 200) {
        throw new RuntimeException('Image load failed: HTTP '.$response->getStatusCode());
    }
    // The quiet response is finite; it can still contain several JSON lines.
    foreach (preg_split('/\r?\n/', $body->getContents()) as $line) {
        if (trim($line) === '') {
            continue;
        }
        $frame = json_decode($line, true, 512, JSON_THROW_ON_ERROR);
        if (isset($frame['error']) || isset($frame['errorDetail']['message'])) {
            throw new RuntimeException($frame['error'] ?? $frame['errorDetail']['message']);
        }
        echo $frame['stream'] ?? '';
    }
} finally {
    $body?->close();
    if (is_resource($archive)) {
        fclose($archive);
    }
}