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3 liveuser 1 
<?php
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/*
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 * This file is part of the Symfony package.
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 *
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 * (c) Fabien Potencier <fabien@symfony.com>
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 *
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 * For the full copyright and license information, please view the LICENSE
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 * file that was distributed with this source code.
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 */
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namespace Symfony\Component\HttpFoundation\Session;
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/**
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 * Session utility functions.
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 *
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 * @author Nicolas Grekas <p@tchwork.com>
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 * @author Rémon van de Kamp <rpkamp@gmail.com>
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 *
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 * @internal
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 */
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final class SessionUtils
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{
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    /**
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     * Finds the session header amongst the headers that are to be sent, removes it, and returns
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     * it so the caller can process it further.
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     */
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    public static function popSessionCookie(string $sessionName, string $sessionId): ?string
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    {
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        $sessionCookie = null;
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        $sessionCookiePrefix = sprintf(' %s=', urlencode($sessionName));
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        $sessionCookieWithId = sprintf('%s%s;', $sessionCookiePrefix, urlencode($sessionId));
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        $otherCookies = [];
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        foreach (headers_list() as $h) {
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            if (0 !== stripos($h, 'Set-Cookie:')) {
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                continue;
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            }
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            if (11 === strpos($h, $sessionCookiePrefix, 11)) {
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                $sessionCookie = $h;
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                if (11 !== strpos($h, $sessionCookieWithId, 11)) {
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                    $otherCookies[] = $h;
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                }
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            } else {
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                $otherCookies[] = $h;
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            }
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        }
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        if (null === $sessionCookie) {
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            return null;
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        }
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        header_remove('Set-Cookie');
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        foreach ($otherCookies as $h) {
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            header($h, false);
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        }
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        return $sessionCookie;
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    }
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}