Php Can'；不创建会话

首先，您应该尝试设置虚拟数据以测试会话是否正常工作。就在您的

会话\u start（）之后

<?php
    ob_start();
    session_start();
    require ('openid.php');

    function logout() {
        echo '<form action="logout.php" method="post"><button class="btn btn-danger" type="submit"><i class="fa fa-power-off"></i> Log Out</button></form>'; //logout button
    }

    function steamlogin() {
        try {
            require("settings.php");
            $openid = new LightOpenID($domain);

            if(!$openid->mode) {
                if(isset($_GET['login'])) {
                    $openid->identity = 'http://steamcommunity.com/openid';
                    header('Location: ' . $openid->authUrl());
                }

            return "<form action=\"?login\" method=\"post\"> <input type=\"image\" src=\"http://cdn.steamcommunity.com/public/images/signinthroughsteam/sits_large_noborder.png\"></form>";
            }

             elseif($openid->mode == 'cancel') {
                echo 'User has canceled authentication!';
            } else {
                if($openid->validate()) {
                        $id = $openid->identity;
                        $ptn = "/^http:\/\/steamcommunity\.com\/openid\/id\/(7[0-9]{15,25}+)$/";
                        preg_match($ptn, $id, $matches);

                        $steamid = $matches[1];

                                        $link = file_get_contents("http://api.steampowered.com/ISteamUser/GetPlayerSummaries/v0002/?key=".$key."&steamids=".$steamid."");
                                        $decode = json_decode($link);
                                        $newlink = $decode->response->players->profileurl;
                                        $xml = simplexml_load_file($newlink."?xml=1");
                                        @$custom = $xml->customURL;
                                        if(strlen($custom) <= 4){      
                                                $user = $xml->steamID64;
                                        } else {
                                                $user = $custom;
                                        }      
                                        $_SESSION['steamid'] = $user;

                        //Determine the return to page. We substract "login&"" to remove the login var from the URL.
                        //"file.php?login&foo=bar" would become "file.php?foo=bar"
                        $returnTo = str_replace('login&', '', $_GET['openid_return_to']);
                        //If it didn't change anything, it means that there's no additionals vars, so remove the login var so that we don't get redirected to Steam over and over.
                        if($returnTo === $_GET['openid_return_to']) $returnTo = str_replace('?login', '', $_GET['openid_return_to']);
                        header('Location: '.$returnTo);
                } else {
                        echo "User is not logged in.\n";
                }

            }
        } catch(ErrorException $e) {
            echo $e->getMessage();
        }
    }

如果该键在整个请求中都不存在，则表示会话处理程序存在问题（可能缺少写入权限）

如果您的会话正在工作，那么您就开始沿着逻辑树往下走，检查每个If语句中的表达式，看看执行路径是什么，您没有提供任何当前输出，因此我无法立即判断

这不是一个确定的答案，但我相信如果你听从我的建议，你会找到问题的根源。
你是否使用了session_start（）？在开发和测试时不要使用
@
来抑制错误。您想看到错误。是的。包含后的第一行…请向我们显示文件的其余部分，但我的最佳选择是：在其中一个includes@usandfriends不仅在开发过程中，您不应该抑制错误。@GeorgeCristian会话不起作用的原因有很多。到目前为止，最常见的问题是IMO缺乏写入权限。请通过session_save_path（）或php.ini查找存储会话的位置，并检查其权限。其他原因可能包括浏览器中禁用cookie、试图跨域共享会话、cookie路径错误等等。
$_SESSION['test'] = 'test';
var_dump($_SESSION);