How to remove a variable from a PHP session array

Question

I have PHP code that is used to add variables to a session    lt  php     session start        if isset   GET  name                    name   isset   SESSION  name        SESSION  name     array             name       GET  name              SESSION  name      name            if  isset   POST  remove                   unset   SESSION  name             gt   lt pre gt    lt  php print r   SESSION     gt    lt  pre gt    lt form name  input  action  index php name  lt  php echo  list   gt   method  post  gt     lt input type  submit  name   add value  Add    gt   lt  form gt    lt form name  input  action  index php name  lt  php echo  list2   gt   method  post  gt     lt input type  submit  name  remove  value  Remove    gt   lt  form gt    I want to remove the variable that is shown in  list2 from the session array when the user chooses  Remove     But when I unset  ALL the variables in the array are deleted   How I can delete just one variable

User · Answer

Is the   SESSION  name   variable an array  If you want to delete a specific key from within an array  you have to refer to that exact key in the unset   call  otherwise you delete the entire array  e g    name   array 0   gt   a   1   gt   b   2   gt   c    unset  name      deletes the entire array unset  name 1       deletes only the  b  entry   Another minor problem with your snippet  You re mixing GET query parameters in with a POST form  Is there any reason why you can t do the forms with  name  being passed in a hidden field  It s best to not mix get and post variables  especially if you use   REQUEST elsewhere  You can run into all kinds of fun trying to figure out why   GET  name   isn t showing up the same as   POST  name    because the server s got a differnt EGPCS order set in the  variables order   ini setting    lt form blah blah blah method  post  gt     lt input type  hidden  name  name  value   lt    htmlspecialchars  list1    gt     gt     lt input type  submit  name  add  value  Add   gt   lt  form gt    And note the htmlspecialchars   call  If either  list1 or  list2 contain a double quote      it ll break your HTML

User · Answer

if  isset   POST  remove            key array search   GET  name     SESSION  name         if  key   false      unset   SESSION  name    key          SESSION  name     array values   SESSION  name          Since   SESSION  name   is an array  you need to find the array key that points at the name value you re interested in  The last line rearranges the index of the array for the next use

User · Answer

Currently you are clearing the name array  you need to call the array then the index you want to unset within the array    ar 0   2  ar 1   7  ar 2   9  unset   ar 2     Two ways of unsetting values within an array    lt  php   remove by key  function array remove key         args    func get args      return array diff key  args 0  array flip array slice  args 1         remove by value  function array remove value         args   func get args      return array diff  args 0  array slice  args 1        fruit inventory   array     apples    gt  52     bananas    gt  78     peaches    gt   out of season      pears    gt   out of season      oranges    gt   no longer sold      carrots    gt  15     beets    gt  15      echo   lt pre gt Original Array  n        print r  fruit inventory TRUE          lt  pre gt       For example  beets and carrots are not fruits     fruit inventory   array remove key  fruit inventory                                       beets                                        carrots    echo   lt pre gt Array after key removal  n        print r  fruit inventory TRUE          lt  pre gt       Let s also remove  out of season  and  no longer sold  fruit     fruit inventory   array remove value  fruit inventory                                         out of season                                          no longer sold    echo   lt pre gt Array after value removal  n        print r  fruit inventory TRUE          lt  pre gt      gt     So  unset has no effect to internal array counter     http   us php net unset

User · Answer

If you want to remove or unset all   SESSION  s then try this  session destroy      If you want to remove specific   SESSION  name   then try this  session unset  name

User · Answer

To remove a specific variable from the session use   session unregister  variableName       see documentation  or   unset   SESSION  variableName       NOTE  session unregister   has been DEPRECATED as of PHP 5 3 0 and REMOVED as of PHP 5 4 0

User · Answer

Try this one   if FALSE       key   array search   GET  name     SESSION  name            unset   SESSION  name    key

User · Answer

Simply use this method    lt  php       SESSION  foo      bar      set session      print   SESSION  foo      print it     unset   SESSION  foo       unset session    gt

[php] How to remove a variable from a PHP session array

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