<?php
/**
* @see https://github.com/zendframework/zend-diactoros for the canonical source repository
* @copyright Copyright (c) 2018 Zend Technologies USA Inc. (https://www.zend.com)
* @license https://github.com/zendframework/zend-diactoros/blob/master/LICENSE.md New BSD License
*/
namespace Zend\Diactoros;
use UnexpectedValueException;
use function preg_match;
/**
* Return HTTP protocol version (X.Y) as discovered within a `$_SERVER` array.
*
* @param array $server
* @return string
* @throws UnexpectedValueException if the $server['SERVER_PROTOCOL'] value is
* malformed.
*/
function marshalProtocolVersionFromSapi(array $server)
{
if (! isset($server['SERVER_PROTOCOL'])) {
return '1.1';
}
if (! preg_match('#^(HTTP/)?(?P<version>[1-9]\d*(?:\.\d)?)$#', $server['SERVER_PROTOCOL'], $matches)) {
throw new UnexpectedValueException(sprintf(
'Unrecognized protocol version (%s)',
$server['SERVER_PROTOCOL']
));
}
return $matches['version'];
}