note 107273 added to function.session-unset

Because I needed to leave a user logged in but also needed to clear a session of temporarily used variables, session_unset was a little too heavy handed. Instead I wrote this this simple little function to fit the bill - it allows you to retain certain session variables whilst unsetting everything else. I hope it's useful for someone. <?php session_start(); $_SESSION['1'] = "One"; $_SESSION['2'] = "Two"; $_SESSION['3'] = "Three"; $_SESSION['4'] = "Four"; $_SESSION['5'] = "Five"; $_SESSION['6'] = "Six"; $_SESSION['7'] = "Seven"; $_SESSION['8'] = "Eight"; $_SESSION['9'] = "Motorway"; print_r($_SESSION); # you can tell the function to hang on to particular session variables $success = session_unset_partial(array('2','4','6','8')); if ($success){echo "Array partially cleared.\n";} print_r($_SESSION); # or you can tell it to wipe everything but the required permanent session variables $success = session_unset_partial(); if ($success){echo "Array partially cleared.\n";} print_r($_SESSION); function session_unset_partial($UserDontUnsetThese = false){ # quick error check if ($UserDontUnsetThese && !is_array($UserDontUnsetThese)){ echo "Array expected for user-defined session variables\n"; return false; } # list set session vars that should not be unset here # the ones listed here allow the user to remain # logged in whilst all other temporary session # variables are deleted $DontUnsetThese = array ( '9' ); if ($UserDontUnsetThese){ # combine the permanent array with the user-requested session variables # to create a list of session variables that should be retained $DontUnsetThese = array_merge($DontUnsetThese , $UserDontUnsetThese); } # now do the unsetting foreach ($_SESSION as $key => $value){ if (!in_array($key , $DontUnsetThese)){ unset($_SESSION[$key]); } } return true; } ?> ---- Server IP: 92.48.74.199 Probable Submitter: 188.222.76.202 ---- Manual Page -- http://www.php.net/manual/en/function.session-unset.php Edit -- https://master.php.net/note/edit/107273 Del: integrated -- https://master.php.net/note/delete/107273/integrated Del: useless -- https://master.php.net/note/delete/107273/useless Del: bad code -- https://master.php.net/note/delete/107273/bad+code Del: spam -- https://master.php.net/note/delete/107273/spam Del: non-english -- https://master.php.net/note/delete/107273/non-english Del: in docs -- https://master.php.net/note/delete/107273/in+docs Del: other reasons-- https://master.php.net/note/delete/107273 Reject -- https://master.php.net/note/reject/107273 Search -- https://master.php.net/manage/user-notes.php