Why do I need the isset() function in php?
if-statement, isset, php, post
Solution
Because
$a = array("x" => "0");
if ($a["x"])
echo "This branch is not executed";
if (isset($a["x"]))
echo "But this will";
(See also http://hk.php.net/manual/en/function.isset.php and http://hk.php.net/manual/en/language.types.boolean.php#language.types.boolean.casting)
Problem
I am trying to understand the difference between this: ``` if (isset($_POST['Submit'])) { //do something } ``` and ``` if ($_POST['Submit']) { //do something } ``` It seems to me that if the $_POST['Submit'] variable is true, then it is set. Why would I need the isset() function in this case?