![]() ![]() ![]() Check if the session has been created with the isset() function. In this way, we check the time interval of a session.įor example, start the session in the server with the session_start() function. Thus, we can check the time by calculating the differences from the last activity to the current time. ![]() We can use the $_SESSION variable to store the timestamp of the last activity. The time() function returns the current time. We can use the session_unset() function to unset the $_SESSION variable at the run-time and use the session_destroy() function to destroy the session from the storage. Use the session_unset() and session_destroy() Functions to Set the Session Timeout in PHP This function generates a new session id for the current session destroying the previous session-id. We will introduce another method to invalidate the current session id using the session_regenerate_id() function. This method uses an array to store the session variable. The unset() function takes the session variable as the parameter. We will also demonstrate another way to set the session timeout in PHP using the unset() function. It checks the time interval from the last activity to the current time to destroy the session. We will destroy the session after 30 minutes. This article will introduce a method to destroy the session in PHP using the session_unset() and the session_destroy() functions. Use the session_regenerate_id() Function to Change the Current Session ID in PHP.Use the unset() Function to Set the Session Timeout in PHP.Use the session_unset() and session_destroy() Functions to Set the Session Timeout in PHP.So one way is to change the value of e_trans_sid to 1 in the configuration file php.ini. (The exact principle is to be confirmed here) The two pages generate two session files on the server side, and they are not related. In this way, the subsequent page cannot track the session of the, which is what we call undeliverable. My personal understanding is that once this parameter is set to 0, then each URL will start a session. This parameter specifies whether to enable transparent SID support, that is, whether the session is passed with the URL. Go to the session section and see that the e_trans_sid parameter is set to zero. Let's write a php file first:, and send it to the server to see the parameter configuration of the server. In the cookie on the client side, set the value of the cookie, and then pass this value to the session_id() function. Of course, we must use the client to store cookies and store the obtained sessionID to the client. Of course, it is also possible that you do not have the authority to control the server and you are not as lucky as me to be able to modify the php.ini settings. That's it, everything is ok, of course, if you don't believe it, test it out - set a session value and come back after 10 days and a half months, if your computer is not powered off or down, you can still see this sessionid. If this time is exceeded, the session data will be automatically deleted! Then we also set it to 99999999. This is the time that the session data is stored on the server side. It is because of this that the PHP session cannot be used permanently! So let's set it to a number that we think is big, how about 999999999, ok! that's it. The default is 0, which means that the SessionID will be invalid as soon as the browser closes. This represents the time that the SessionID is stored in the client cookie. Set the value of this to 1 and use the cookie to pass the sessionid Not modifying the program is the best way, because if you modify the program, the testing department must be very depressed, then you can only modify the system environment configuration, which is actually very simple, open the php.ini settings file, and modify the three lines as follows: #probability is gc_probability/gc_divisorĬd /path/to/sessions find -cmin +24 | xargs rm This probability is controlled by the following parameters Then, restart your web service (usually apache) to That's it.īy default, for every php request, there will be a 1/100 probability of recycling, so it may be simply understood as "every 100 php requests have a recycling occurrence". Therefore, modifying the gc_maxlifetime variable in the php.ini file can extend the expiration time of the session: (for example, we changed the expiration time to 86400 seconds) If you modify these two values, it will reduce the efficiency of php. are the numerator and denominator respectively, so the probability of running gc in the session is 1%. ![]() The default values of session.gc_probability and session.gc_divisor are 1 and 100 respectively. Use session.gc_probability and session.gc_divisor to determine the probability of running gc in the session. Session.gc_maxlifetime The original session expiration is a small probability event. ![]()
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