检查会话是否设置，如果没有，创建一个? [英] Check if session is set or not, and if not create one?

问题描述

我想检查当前是否设置了会话，如果是，则在不创建会话的情况下允许页面正常运行(什么都不做).

I want to check if a session is currently set, and if so do allow the page to run as normal (do nothing) if not create a session.

我查看了另一个 SO 问题，其中发布了以下代码:

I had a look at another SO question, in which the following code was posted:

if ( empty( $_SESSION['login'] )) { } else { }

最简单的方法是为每个会话设置类似 $_SESSION['a'] 的东西，然后运行 ​​if(empty($_SESSION['a'])) 检查会话是否存在?

Would the easiest way to do this be to set something like $_SESSION['a'] for each session, and then run if(empty($_SESSION['a'])) to check if a session exists?

再说一次，你能不能在不调用 session_start() 的情况下使用会话变量，从而使它过时(我昨天试过这个，虽然作为回声，而不是检查变量是否在没有执行的情况下执行的 if 语句?意识到需要调用 session_start() 才能回显变量).

Then again, can you use a session variable without invoking session_start() in the first place, thus making it obsolete (I tried this yesterday, as an echo though, not an if statement to check that a variable was carrying through without realizing that session_start() needed to be invoked before I could echo the variable).

可能有一种常用的简单方法，我就是找不到.

There's probably an easy way that's oft used, I just can't seem to find it.

任何帮助将不胜感激！

推荐答案

session_id() 返回标识当前会话的字符串.如果会话尚未初始化，它将返回一个空字符串.

session_id() returns the string identifying the current session. If a session hasn't been initialized, it will return an empty string.

 if(session_id())
 {
      // session has been started
 }
 else
 {
      // session has NOT been started
      session_start();
 }

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