<?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 function array_key_exists;
use function strpos;
use function strtolower;
use function strtr;
use function substr;
/**
* @param array $server Values obtained from the SAPI (generally `$_SERVER`).
* @return array Header/value pairs
*/
function marshalHeadersFromSapi(array $server)
{
$headers = [];
foreach ($server as $key => $value) {
// Apache prefixes environment variables with REDIRECT_
// if they are added by rewrite rules
if (strpos($key, 'REDIRECT_') === 0) {
$key = substr($key, 9);
// We will not overwrite existing variables with the
// prefixed versions, though
if (array_key_exists($key, $server)) {
continue;
}
}
if ($value && strpos($key, 'HTTP_') === 0) {
$name = strtr(strtolower(substr($key, 5)), '_', '-');
$headers[$name] = $value;
continue;
}
if ($value && strpos($key, 'CONTENT_') === 0) {
$name = 'content-' . strtolower(substr($key, 8));
$headers[$name] = $value;
continue;
}
}
return $headers;
}