Php where is session stored

Dhillon 6 6 silver badges 6 6 bronze badges. How does it work? How does it know it's me? Emeka Obianom Emeka Obianom 1, 3 3 gold badges 15 15 silver badges 35 35 bronze badges. Evan Gertis Evan Gertis 1, 9 9 silver badges 26 26 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast Explaining the semiconductor shortage, and how it might end.

Does ES6 make JavaScript frameworks obsolete? Featured on Meta. Now live: A fully responsive profile. Linked 3. See more linked questions. Related The location of the temporary file is determined by a setting in the php. Before using any session variable make sure you have setup this path. PHP first creates a unique identifier for that particular session which is a random string of 32 hexadecimal numbers such as 3c7foj34c3jjhjkop2fce When a PHP script wants to retrieve the value from a session variable, PHP automatically gets the unique session identifier string from the PHPSESSID cookie and then looks in its temporary directory for the file bearing that name and a validation can be done by comparing both values.

A session ends when the user loses the browser or after leaving the site, the server will terminate the session after a predetermined period of time, commonly 30 minutes duration. This function first checks if a session is already started and if none is started then it starts one. This cookie can be seen below in the image from Chrome's developer tools.

On the server side, the system stores this Session ID and an associated array of information concerning the client that your PHP scripts can use, in a file or in a database. This line of code should come before any output is produced by the script!! To set a value, treat this variable like you would any array. When working with session values, it is often useful to test whether a particular session variable exists. The easiest way to check to see if a variable exists is with isset.

If you wish to delete a session variable, you should unset it just like you can any variable in PHP :. If this is the case, the prior saved environment is recreated. If you turn on session. Registered variables which are undefined are marked as being not defined.