Check if cookies are enabled

Question

I am working on a page that requires javascript and sessions  I already have code to warn the user if javascript is disabled  Now  I want to handle the case where cookies are disabled  as the session id is stored in cookies   I have thought of just a couple ideas    Embedding the session id in the links and forms Warn the user they must enable cookies if they are disabled  would need help detecting if cookies are disabled    What is the best way to approach this  Thanks  EDIT  Based on the articles linked  I came up with my own approach and thought I would share  somebody else might be able to use it  maybe I will get a few critiques   Assumes your PHP session stores in a cookie named PHPSESSID    lt div id  form  style  display none  gt Content goes here lt  div gt   lt noscript gt Sorry  but Javascript is required lt  noscript gt   lt script type  text javascript  gt  lt  -- if document cookie indexOf  PHPSESSID    -1     document getElementById  form   style display     else    document write   lt p gt Sorry  but cookies must be enabled lt  p gt     -- gt  lt  script gt

User · Answer

You cannot in the same page s loading set and check if cookies is set you must perform reload page     PHP run at Server  cookies at client  cookies sent to server only during loading of a page  Just created cookies have not been sent to server yet and will be sent only at next load of the page

User · Answer

JavaScript  In JavaScript you simple test for the cookieEnabled property  which is supported in all major browsers  If you deal with an older browser  you can set a cookie and check if it exists   borrowed from Modernizer    if  navigator cookieEnabled  return true      set and read cookie document cookie    cookietest 1   var ret   document cookie indexOf  cookietest       -1      delete cookie document cookie    cookietest 1  expires Thu  01-Jan-1970 00 00 01 GMT    return ret     Modernizer cookie check commit Checking if Cookies are Enabled   PHP  In PHP it is rather  complicated  since you have to refresh the page or redirect to another script  Here I will use two scripts   somescript php   lt  php session start    setcookie  foo    bar   time   3600   header  location  check php      check php   lt  php echo  isset   COOKIE  foo     amp  amp    COOKIE  foo     bar      enabled     disabled      Detecting if the cookies are enabled with PHP PHP and Cookies  A Good Mix

User · Answer

Answer on an old question  this new post is posted on April the 4th 2013  To complete the answer of  misza  here a advanced method to check if cookies are enabled without page reloading  The problem with  misza is that it not always work when the php ini setting session use cookies is not true  Also the solution does not check if a session is already started   I made this function and test it many times with in different situations and does the job very well       function suGetClientCookiesEnabled      Test if browser has cookies enabled                Avoid overhead  if already tested  return it       if  defined   SU CLIENT COOKIES ENABLED              return SU CLIENT COOKIES ENABLED            bIni   ini get   session use cookies            ini set   session use cookies   1             a   session id           bWasStarted     is string   a    amp  amp  strlen   a           if    bWasStarted                    session start             a   session id                   Make a copy of current session data    aSesDat    isset    SESSION      SESSION array          Now we destroy the session and we lost the data but not the session id        when cookies are enabled  We restore the data later      session destroy           Restart it    session start           Restore copy     SESSION    aSesDat         If no cookies are enabled  the session differs from first session start    b   session id      if    bWasStarted           If not was started  write data to the session container to avoid data loss       session write close                 When no cookies are enabled   a and  b are not the same    b     a      b     define   SU CLIENT COOKIES ENABLED    b       if    bIni         ini set   session use cookies   0           echo  b  1   0     return  b          Usage   if  suGetClientCookiesEnabled       echo  Cookies are enabled      else   echo  Cookies are NOT enabled        Important note  The function temporarily modify the ini setting of PHP when it not has the correct setting and restore it when it was not enabled  This is only to test if cookies are enabled  It can get go wrong when you start a session and the php ini setting session use cookies has an incorrect value  To be sure that the session is working correctly  check and or set it before start a session  for example      if  suGetClientCookiesEnabled                   echo  Cookies are enabled            ini set   session use cookies   1            echo  Starting session           start session                 else   echo  Cookies are NOT enabled

User · Answer

You can make an Ajax Call  Note  This solution requires JQuery    example php   lt  php     setcookie  CookieEnabledTest    check   time   3600     gt    lt script type  text javascript  gt       CookieCheck         function CookieCheck                   post                        ajax php                                 cmd   cookieCheck                             function  returned data  status                                if  status      success                                         if  returned data      enabled                                                 alert   Cookies are activated                                               else                                               alert   Cookies are not activated                                                                             lt  script gt    ajax php   cmd   filter input INPUT POST   cmd     if   isset   cmd    amp  amp   cmd     cookieCheck          echo  isset   COOKIE  CookieEnabledTest     amp  amp    COOKIE  CookieEnabledTest     check      enabled     disabled       As result an alert box appears which shows wheter cookies are enabled or not  Of course you don t have to show an alert box  from here you can take other steps to deal with deactivated cookies

User · Answer

Here is a very useful and lightweight javascript plugin to accomplish this  js-cookie  Cookies set  cookieName    Value          setTimeout function            var cookieValue    Cookies get  cookieName            if cookieValue              console log  Test Cookie is set               else              document write   lt p gt Sorry  but cookies must be enabled lt  p gt                       Cookies remove  cookieName             1000     Works in all browsers  accepts any character

User · Answer

But to check whether cookies are enabled using isset   COOKIE  cookie    you have to refresh  Im doing it ths way  with sessions based on cookies     session start     a   session id    session destroy     session start     b   session id    session destroy     if   a     b      echo Cookies ON   else     echo Cookies OFF

User · Answer

it is easy to detect whether the cookies is enabled    set a cookie  get the cookie   if you can get the cookie you set  the cookie is enabled  otherwise not   BTW  it is a bad idea to Embedding the session id in the links and forms  it is bad for SEO  In my opinion  it is not very common that people dont want to enable cookies

User · Answer

JavaScript  You could create a cookie using JavaScript and check if it exists     Set a Cookie  document cookie  testcookie      Check if cookie exists  cookiesEnabled  document cookie indexOf  testcookie    -1   true   false    Or you could use a jQuery Cookie plugin    Set a Cookie    cookie  testcookie    testvalue      Check if cookie exists  cookiesEnabled     cookie  testcookie       true   false    Php  setcookie  testcookie    testvalue     if  isset    COOKIE  testcookie              Not sure if the Php will work as I m unable to test it

User · Answer

Cookies are Client-side and cannot be tested properly using PHP  That s the baseline and every solution is a wrap-around for this problem   Meaning if you are looking a solution for your cookie problem  you are on the wrong way  Don y use PHP  use a client language like Javascript   Can you use cookies using PHP  Yes  but you have to reload to make the settings to PHP  visible    For instance  Is a test possible to see if the browser can set Cookies with plain PHP   The only correct answer is  NO      Can you read an already set Cookie   YES  use the predefined   COOKIE  A copy of the settings before you started PHP-App

User · Answer

A transparent  clean and simple approach  checking cookies availability with PHP and taking advantage of AJAX transparent redirection  hence not triggering a page reload  It doesn t require sessions either   Client-side code  JavaScript   function showCookiesMessage cookiesEnabled        if  cookiesEnabled     true           alert  Cookies enabled        else         alert  Cookies disabled         document  ready function         var jqxhr     get   cookiesEnabled php        jqxhr done showCookiesMessage          JQuery AJAX call can be replaced with pure JavaScript AJAX call   Server-side code  PHP   if  isset   COOKIE  cookieCheck           echo  true     else       if  isset   GET  reload               echo  false         else           setcookie  cookieCheck    1   time     60           header  Location        SERVER  PHP SELF       reload            exit              First time the script is called  the cookie is set and the script tells the browser to redirect to itself  The browser does it transparently  No page reload takes place because it s done within an AJAX call scope   The second time  when called by redirection  if the cookie is received  the script responds an HTTP 200  with string  true    hence the showCookiesMessage function is called   If the script is called for the second time  identified by the  reload  parameter  and the cookie is not received  it responds an HTTP 200 with string  false  -and the showCookiesMessage function gets called

[php] Check if cookies are enabled

Examples related to php

Examples related to javascript

Examples related to session-cookies