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Any body can explain me how session works in PHP. for eg. 3 users logged into gmail. how the server identifies these 3 uers. what are the internel process behind that.
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A session is a way to store information (in variables) to be used across multiple pages. Unlike a cookie, the information is not stored on the users computer.
In computer systems, a user session begins when a user logs in to or accesses a particular computer, network, or software service. It ends when the user logs out of the service, or shuts down the computer. From this definition, I conclude that as soon as the user enters, a session is created Automatically.
The definition of a session is a meeting, series of meetings or school term. An example of a session is jury members meeting to agree on a verdict. An example of a session is the time when students are attending classes at school.
Sessions are a combination of a server-side session data and a client-side cookie, with the client-side cookie containing nothing other than a reference to the correct data on the server. Thus, when the user visits the site, their browser sends the reference code to the server, which loads the corresponding data.
This may seem a bit clumsier than just having a client-side cookie with all your data in, but there are a few advantages:
It is also important to note that sessions only last till the user closes their browser, whereas cookies can be configured to last longer. However, other than the above, there is not much difference between session data and cookie data for most purposes.
The following is a very good article which explains how sessions and cookies work within PHP.
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