![]() For example, if you run an external program that takes 100 seconds and you have set the time limit to 30 seconds, PHP will let the script carry on for the full 100 seconds and terminate immediately afterwards. PHP may let some scripts go over the time limit if control is outside the script. ![]() If you use set_time_limit() to a value greater than Apache's timeout value, Apache will stop PHP before PHP stops itself. In Apache, this is set under Timeout in nf, and defaults to 300 seconds. That said, most web servers have their own time limit over and above PHP's. When you use this function, the script timer is reset to 0 if you set 50 as the time limit, then after 40 seconds set the time limit to 30, the script will run for 70 seconds in total. Or you can pass 0, which means "Let the script run as long as it needs." This example sets the script execution time to 30 seconds: set_time_limit(30) The function takes one parameter, which is the number of seconds you want the script to have. This value is usually set inside php.ini under the max_execution_time setting however, you can override that here. The set_time_limit() function lets you set how long a script should be allowed to execute. You can set session.gc_maxlifetime and okie_lifetime using the ini_set(, ) function.įor this, at the begining of your script, call the function passing the directive and the desired value to set it.Synopsis void set_time_limit ( int seconds ) Using ini_set directives for setting session timeout Do not use long life session IDs for this. If an auto-login feature is required, developers must implement their own secure auto-login feature. Most applications should use “0” for this. If developers set this other than 0, it may allow other users to use the session ID. Therefore, when the browser is terminated, the session ID cookie is deleted immediately. It informs browsers not to store the cookie to permanent storage. Defaults to 1440 (24 minutes).įind the directive okie_lifetime and set it to 0 (zero). Garbage collection may occur during session start (depending on session.gc_probability and session.gc_divisor). It specifies the number of seconds after which data will be seen as ‘garbage’ and potentially cleaned up. Developers should manage the lifetime of sessions with a timestamp by themselves. Reliance on this setting is not recommended. The session.gc_maxlifetime is a setting for deleting obsolete session ID. Using php.ini settings for session timeoutįind the directive session.gc_maxlifetime and choose smallest possible. okie_lifetime: It is used to set the expiration time limit for the PHPSESSID cookie.Īnother way to set PHP session timeout is by using the ini_set() function in a PHP script. Session.gc_maxlifetime: It is used to set the time limit in seconds to store the session information in the server for a long time. The timeout limit of the session in PHP is configured using two directives in the php.ini file: Read the Session timeout considerations in this article. So your sessions should not last longer than 30 minutes. The session expiration timeout values must be set accordingly with the purpose and nature of the web application, and balance security and usability, so that the user can comfortably complete the operations within the web application without his session frequently expiring… Common idle timeouts ranges are 2-5 minutes for high-value applications and 15- 30 minutes for low risk applications.”įrom the federal guideline perspective, the draft NIST 800-63B – Digital Identity Guidelines proposes the following recommendation for providing high confidence for authentication: “Reauthentication of the subscriber SHALL be repeated following no more than 30 minutes of user inactivity.” ![]() The shorter the session interval is, the lesser the time an attacker has to use the valid session ID. “Insufficient session expiration by the web application increases the exposure of other session-based attacks, as for the attacker to be able to reuse a valid session ID and hijack the associated session, it must still be active. OWASP, one of the most authoritative web application security standards organizations, says about session timeouts:
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