Set Session variable using javascript in PHP

Question

Is it possible to set PHP session variables using Javascript

User · Answer

I solved this question using Ajax  What I do is make an ajax call to a PHP page where the value that passes will be saved in session   The example that I am going to show you  what I do is that when you change the value of the number of items to show in a datatable  that value is saved in session       table-campus   on   length dt   function   e  settings  len           ajax           data           numElems   len          url                Utiles GuardarNumElems php          type          post                 And the GuardarNumElems php is as following    lt  php         session start         if isset    POST  numElems                numElems     POST  numElems                      SESSION  elems table      numElems       else            SESSION  elems table     25           gt

User · Answer

The session is stored server-side so you cannot add values to it from JavaScript  All that you get client-side is the session cookie which contains an id  One possibility would be to send an AJAX request to a server-side script which would set the session variable  Example with jQuery s  post   method     post   setsessionvariable php     name   value        You should  of course  be cautious about exposing such script

User · Answer

You can t directly manipulate a session value from Javascript - they only exist on the server   You could let your Javascript get and set values in the session by using AJAX calls though   See also   Javascript and session variables jQuery click event to change php session variable

User · Answer

or by pure js  see also on StackOverflow    JavaScript post request like a form submit  BUT WHY try to set   session with js   any JS variable can be modified by a player with some 3rd party tools  firebug   thus any player can mod the   session     And PHP cant give js any secret codes  or even  rolling  encrypted  to return  it is all visible   Jquery or AJAX can t help  it s all js in the end   This happens in online game design a lot    Maybe a bit of Game Theory   forgive me  I have a masters and love to put theory to use      Like in crimegameonline com  I initialize a minigame puzzle with PHP  saving the initial board in   SESSION  foo    Then  I use php to  make html that  shows the initial puzzle start   Then  js takes over  watching buttons and modding element xy s as players make moves   I DONT want to play client-server  like WOW  and ask the server  hey  my player want s to move to xy  what should I do     It s a lot of bandwidth  I don t want the server that involved     And I can just send POSTs each time the player makes an error  or dies    The player can block outgoing POSTs  and alter local JS vars to make it forget the out count  or simply modify outgoing POST data   YES  people will do this  especially if real money is involved   If the game is small  you could send post updates EACH move  button click   1-way  with post vars of the last TWO moves   Then  the server sanity checks last and cats new in a   SESSION  allMoves     If the game is massive  you could just send a  halfway  update of all preceeding moves  and see if it matches in the final update s list   Then  after a js thinks we have a win  add or mod a button to change pages   document getElementById  but1   onclick Function  leave          function leave         var line  crimegameonline-p9b php       top location href line      Then the new page s PHP looks at   SESSION  init   and plays thru each of the   SESSION  allMoves   to see if it is really a winner   The server  PHP  must decide if it is really a winner  not the client  js

User · Answer

One simple way to set session variable is by sending request to another PHP file  Here no need to use Jquery or any other library   Consider I have index php file where I am creating SESSION variable  say   SESSION  v   0  if SESSION is not created otherwise I will load other file   Code is like this   session start    if  isset   SESSION  v                SESSION  v   0    else       header  Location connect php        Now in count html I want to set this session variable to 1   Content in count html  function doneHandler result       window location  setSession php       In count html javascript part  send a request to another PHP file  say setSession php   where i can have access to session variable   So in setSession php will write  session start       SESSION  v   1  header  Location index php

User · Answer

If you want to allow client-side manipulation of persistent data  then it s best to just use cookies  That s what cookies were designed for

User · Answer

be careful when doing this  as it is a security risk  attackers could just repeatedly inject data into session variables  which is data stored on the server  this opens you to someone overloading your server with junk session data   here s an example of code that you wouldn t want to do     lt input type  hidden  value       name  putIntoSession  gt      lt  php   SESSION  somekey       POST  putIntoSession     gt    Now an attacker can just change the value of putIntoSession and submit the form a billion times  Boom    If you take the approach of creating an AJAX service to do this  you ll want to make sure you enforce security to make sure repeated requests can t be made  that you re truncating the received value  and doing some basic data validation

User · Answer

In JavaScript   jQuery   div session write   load  session write php session name new value      In session write php file    lt   session start     if  isset   GET  session name        SESSION  session name       GET  session name       gt    In HTML    lt div id  div session write  gt   lt  div gt

User · Answer

Not possible  Because JavaScript is client-side and session is server-side  To do anything related to a PHP session  you have to go to the server

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