EDIT : Others have mentioned the session. When session garbage collection occurs, the garbage collector will delete any session data that has not been accessed in longer than session. If this setting is greater than session. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. How long will my session last? Ask Question. Asked 12 years, 1 month ago. Active 6 years, 9 months ago. Viewed k times.
Improve this question. Keith Donegan Keith Donegan When you work with an application, you open it, do some changes, and then you close it. This is much like a Session. The computer knows who you are. It knows when you start the application and when you end. But on the internet there is one problem: the web server does not know who you are or what you do, because the HTTP address doesn't maintain state.
Session variables solve this problem by storing user information to be used across multiple pages e. By default, session variables last until the user closes the browser. But it is not recognizing the client who is logged in, as logged in. I would appreciate your help, Thanks. Therefore, the IF condition will always fail. The Problem is when I look at another page on the website and come back to the specific page the content is hidden.
How do I get the variable to stay on the specific page after looking at others? Let me know if it works. Hi, sorry for the trouble. Hi Alex, thank you for the additional code, i tried it, but the same is still happening.
Hi Tony, please come over my Facebook group. The purpose of this function is to differentiate Sessions. About Sessions security, there are some countermeasures you can take to prevent the most common attacks.
My debug experience with PHP are limited — yet. In this case, if the Session is opened in the main script it will be available in the included file too.
Hi Alex! This is the best clarification about the subject. I have a question. Am I right? In your case, the POST request data sent from index. Which section of the tutorial make you think so? Very nice, useful and explicit article, I have a slight issue here. I will like to create session variables eg user shopping cart items on my computer and be able to access that same data when i log in using another device. How can i achieve this? However, you can achieve the same result by keeping the session data inside a database.
The data will be linked to the user. Then, when the same user logs in from another device, you can read back the same data. Then, when the user logs in again, you read that data back from the db and you rebuild the same cart. After that time, the browser will unset the cookie. If this paramer is 0 then the cookie will be deleted when the browser page is closed.
PHP Sessions explained. Then this guide is for you. Using Sessions is very simple. This is basically all you need to know to start using Sessions, at least as a start. Here is the code:. Here is the PHP code:. Not serializable types include local and remote file handles, database connection resources, sockets and so on.
These variable types cannot be stored and retrieved across subsequent client accesses. Cookies Sessions use cookies to identify remote clients. Sessions cookie lifetime How long does a Session lasts? The Session lifetime is the maximum time interval from when the Session is created for the first time until it expires. A new Session must therefore be created.
By default, a Session will only last until the remote client will close its browser. This may or may not the best setting for your application, depending on how you want to use Sessions. In the next chapter you will see how you can change this value. This is an example on how to set a custom name for your Session:. This is an important option: it tells how long this Session will remain active. So, if you set this value to , this Session will expire after one hour.
Setting this option to 0 zero has a special meaning: the Session will be valid only until the client closes the browser. This is also the default value. Usually you want to leave this parameter to the default value the domain name of the server , but you can change it to restrict the domain. This is a good idea if your applications deals with sensitive or critical data, as Session Cookies sent over unencrypted connections can be read and used for Session hijacking see the last chapter for more details.
Personally it played its role for some quick patching of legacy code I had to maintain. If you open a popup window please no commercial ones!
Note I don't use SID for this, because it will not allways be available. Be warned that depending on end of script to close the session will effectively serialize concurrent session requests. Concurrent background "data retrieval" e. Initiating a session may overwrite your own custom cache control header, which may break clicking back to get back to a prior post request on Chrome at least.
On my system it was setting 'no-store', which is much more severe than 'no-cache' and what was breaking the back-button. To avoid the notice commited by PHP since 4. Thus, the session at this point exists in the server process memory, but won't be visible as a row in the DB before the script ends. This seems reasonable, because this avoids some unnecessary database access and resource usage before we even populate our session with meaningfull and definitive data, but this also has side-effects.
This failed because no session was in the db at that point, yet! As soon as I find an "elegant" solution, or a completely different approach, I will post some working sample code. In the meanwhile Websites are prone to Session Attack where its proper usage is not done. Code below starts the session for every request. One should start the session after properly authenticating.
Due to the filesystems mounting parameters, atime will normally not be updated. Instead of atime, mtime will be delivered. This behavior may cause an early session death and your users my be kicked of your login system. To keep the session alive it will be necessary to write something into the sessionfile at each request, e. James at skinsupport dot com raises a good point warning about additional requests from the browser. The request for favicon.
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