1<?php
2
3namespace GuzzleHttp\Handler;
4
5use GuzzleHttp\Utils;
6
7/**
8 * @internal
9 */
10final class HeaderProcessor
11{
12    /**
13     * Returns the HTTP version, status code, reason phrase, and headers.
14     *
15     * @param string[] $headers
16     *
17     * @return array{0:string, 1:int, 2:?string, 3:array}
18     *
19     * @throws \RuntimeException
20     */
21    public static function parseHeaders(array $headers): array
22    {
23        if ($headers === []) {
24            throw new \RuntimeException('Expected a non-empty array of header data');
25        }
26
27        $parts = \explode(' ', \array_shift($headers), 3);
28        $version = \explode('/', $parts[0])[1] ?? null;
29
30        if ($version === null) {
31            throw new \RuntimeException('HTTP version missing from header data');
32        }
33
34        $status = $parts[1] ?? null;
35
36        if ($status === null) {
37            throw new \RuntimeException('HTTP status code missing from header data');
38        }
39
40        return [$version, (int) $status, $parts[2] ?? null, Utils::headersFromLines($headers)];
41    }
42}
43