array_key_exists（“id”，$ _SESSION）和$ _SESSION ['id]之间的区别;

Question

in this code

if ((array_key_exists("id", $_SESSION) AND $_SESSION['id']) OR (array_key_exists("id", $_COOKIE) AND $_COOKIE['id'])) {

    header("Location: loggedPage.php");

}

I dont know different between them. Can someone explain it to me?

Thanks

Minh Phuc

Answer 1

array_key_exists(“id”, $_SESSION ) :

This lines checks whether id key exists in $_SESSION (Array) and returns true or false.

$_SESSION['id']) :

This lines returns the value of id in SESSION or returns NULL