note 106000 deleted from function.array-key-exists by crell

Note Submitter: glitch dot mr at gmail dot com ---- As you might know, isset() is actually working like @$variable===NULL. As the result, it doesn't actually catch variables set to NULL. If you want to check if variable is set (even to NULL), you can use array_key_exists on $GLOBALS, like there. <?php $me = null; $se = 1; unset($se); // $he is not set if(array_key_exists('me', $GLOBALS)) echo "\$me exists\n"; if(array_key_exists('se', $GLOBALS)) echo "\$se exists\n"; if(array_key_exists('he', $GLOBALS)) echo "\$he exists\n"; ?> In this case, only $me will be detected as $se was removed when code was running and $he was never set.