How do check if a PHP session is empty

Question

Is this bad practice   if    SESSION  something                echo  the session is empty       Is there a way to check if its empty or it is not set  I m actualy doing this   if     SESSION  something               isset   SESSION  something           echo  the session is either empty or doesn  t exist       Does  isset just checks if a   SESSION     exist and doesn t check if  is there are values in the array or not

User · Answer

You could use the count   function to see how many entries there are in the   SESSION array  This is not good practice  You should instead set the id of the user  or something similar  to check wheter the session was initialised or not   if   isset   SESSION  uid          die   Login required         Assuming you want to check if someone is logged in

User · Answer

Use isset  empty or array key exists  especially for array keys  before accessing a variable whose existence you are not sure of  So change the order in your second example   if   isset   SESSION  something         SESSION  something

User · Answer

I would use isset and empty   session start    if isset   SESSION  blah     amp  amp   empty   SESSION  blah          echo  Set and not empty  and no undefined index error        array key exists is a nice alternative to using isset to check for keys   session start    if array key exists  blah    SESSION   amp  amp   empty   SESSION  blah           echo  Set and not empty  and no undefined index error        Make sure you re calling session start before reading from or writing to the session array

User · Answer

The best practice is to check if the array key exists using the built-in array key exists function

User · Answer

you are looking for PHP   s empty   function

User · Answer

I know this is old  but I ran into an issue where I was running a function after checking if there was a session   It would throw an error everytime I tried loading the page after logging out  still worked just logged an error page   Make sure you use exit    if you are running into the same problem        function sessionexists            if  empty   SESSION         return true            else       return false                               if   sessionexists                redirect  https   www yoursite com                exit                else call user func  check the page

User · Answer

If you want to check whether sessions are available  you probably want to use the session id   function    session id   returns the session id for the current session or the empty string      if there is no current session  no current session id exists

User · Answer

if isset   SESSION      else

[php] How do check if a PHP session is empty?

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