note 28456 added to function.is-null

One of the ways to distinguish 0 from null in " ": Since I was using PHP version under 4, I couldn't use "===" nor "is_null." So, in order to exclude 0 from " " ... if (($var == "") && ($var != "0")) { echo "Only cases of null go through here."; } I forgot to add a double quotation around 0 in the if condition and it failed to catch only the cases of null. After adding the double quotation, it worked, but I still don't understand why it needed to be "0" instead of simply 0. -- http://www.php.net/manual/en/function.is-null.php http://master.php.net/manage/user-notes.php?action=edit+28456 http://master.php.net/manage/user-notes.php?action=delete+28456 http://master.php.net/manage/user-notes.php?action=reject+28456