PHP 7.2警告: “Cannot change session name when session is active”[通俗易懂]

大家好，又见面了，我是全栈君。

项目在php7.1 版本正常,迁移服务器php 7.2 报错

Maybe it’s a warning but with Tracy I have an error.

To solve this I put session_write_close(); before session_set_cookie_params();. It’s not a good fix but it’s works

session_name() as well as session_set_cookie_params() are always nonesense if the session is already running.

翻译: session_name（）以及session_set_cookie_params（）总是不存在意义的,如果会话已在运行。

I had a similar problem but finally found a way through. The code below was my first approach that gave me errors.

static function startmysession($lifetime, $path, $domain, $secure, $httponly){

    session_set_cookie_params($lifetime, $path, $domain, $secure, $httponly);
    session_regenerate_id(true);

    if(!isset($_SESSION)){
        session_start();
    }
}

Now Earlier versions of php overlooked our mistake(We were practically renaming and giving a session that already exists properties which is very wrong. So how did i solve this problem?(现在php的早期版本忽略了我们的错误（我们实际上是在重命名和提供一个已经存在的会话属性，这是非常错误的）。那么我是如何解决这个问题的呢？)

static function startmysession($lifetime, $path, $domain, $secure, $httponly){      
    if(!isset($_SESSION)){  
         session_set_cookie_params($lifetime, $path, $domain, $secure, $httponly);
         @session_regenerate_id(true);    
             session_start();
         }    
    }

I now bound the session_set_cookie_params() just before session start and I test if the session already exists before doing so.(现在，我在会话开始之前绑定了会话session_set_cookie_params（），并在此之前测试会话是否已经存在。)

My solution:

Originally:

        $cookieParams = session_get_cookie_params();

        session_set_cookie_params(
            $seconds,
            $cookieParams['path'],
            $cookieParams['domain'],
            $cookieParams['secure']
            );

Now:

        if(isset($_SESSION)) {
            if ($seconds != 0) {
                setcookie(session_name(), session_id(), time() + $seconds);
            } else {
                setcookie(session_name(), session_id(), $seconds);
            }
        } else {
            $cookieParams = session_get_cookie_params();

            session_set_cookie_params(
                $seconds,
                $cookieParams['path'],
                $cookieParams['domain'],
                $cookieParams['secure']
            );
        }

参考:https://stackoverflow.com/questions/47700336/php-7-2-warning-cannot-change-session-name-when-session-is-active