PHP HTTP GET JSON with stream timeout

<?php
function get_json(string $url, int $timeoutSec = 5): array
{
    $context = stream_context_create([
        'http' => [
            'method' => 'GET',
            'timeout' => $timeoutSec,
            'ignore_errors' => true,
            'header' => ['Accept: application/json'],
        ],
    ]);
    $body = @file_get_contents($url, false, $context);
    if ($body === false) {
        throw new RuntimeException('Request failed: ' . $url);
    }
    $data = json_decode($body, true, 512, JSON_THROW_ON_ERROR);
    if (!is_array($data)) {
        throw new UnexpectedValueException('Expected a JSON object or array');
    }
    return $data;
}