note 28368 added to function.unset

Unset does not work as expected with session variables. Consider the following example: session_start(); if(isset($_GET["save"])) $_SESSION["x"]=$_GET["save"]; if(isset($_GET["del"])) unset($_SESSION["x"]); var_dump($_SESSION["x"]); echo(isset($_SESSION["x"])?"is set":"not set"); Calling the above script with a ?del= parameter (after $_SESSION["x"] was previously set using ?save=123) gives the expected output. However, if you call the script again, this time with no parameters, you'll be surprised to find out that $_SESSION["x"] is still there. I found 2 workarounds for this: one is to assign null instead of calling unset() (i.e. $_SESSION["x"]=null) -- it's worth takink a look at the note from "nhanasoge at hotmail dot com" at the beginning of the page. The second workaround is to use a "host array" as the session variable (which is always serialized) and unset() keys inside the array. NOTE: This applies to php <= 4.2.2. I didn't test on 4.2.3 and 4.3.0. -- http://www.php.net/manual/en/function.unset.php http://master.php.net/manage/user-notes.php?action=edit+28368 http://master.php.net/manage/user-notes.php?action=delete+28368 http://master.php.net/manage/user-notes.php?action=reject+28368