![]() It’s important to note that the session_id function must be placed before the session_start call when you want to start a session with a custom session id. If you want to replace the system-generated session id with your own, you can supply it to the first argument of the session_id function. The session_id function is interesting in that it can also take one argument-a session id. That should give you the current session id. If you want to get a session id, you can use the session_id function, as shown in the following snippet. How to Get a Session IdĪs we discussed earlier, the server creates a unique number for every new session. htaccess file, that should start a session automatically in your PHP application. On the other hand, if you don’t have access to the php.ini file, and you're using the Apache web server, you could also set this variable using the. By default, it’s set to 0, and you can set it to 1 to enable the auto startup functionality. There’s a configuration option in the php.ini file which allows you to start a session automatically for every request- to_start. If there’s a need to use sessions throughout your application, you can also opt in to starting a session automatically without using the session_start function. Otherwise, you’ll encounter the infamous Headers are already sent error. The important thing is that the session_start function must be called at the beginning of the script, before any output is sent to the browser. This is the method that you'll see most often, where a session is started by the session_start function. There are a couple of ways you can start a session in PHP. Whenever you want to deal with session variables, you need to make sure that a session is already started. In this section, we’ll discuss how to start a session in PHP. Now that you've seen a brief introduction to how sessions work, we'll create a few practical examples to demonstrate how to create and manipulate session variables. The following diagram depicts how the HTTP protocol works with sessions. In this way, the user data is preserved across multiple requests, and the user is kept logged in throughout a session. It will then initialize the super-global array variable $_SESSION with the data stored in the session file. It does so by loading the session file which was created earlier, during session initialization. When the server comes across the PHPSESSID cookie, it will try to initialize a session with that session id.
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