全局变量保持覆盖会话变量[重复]

Question

This question is an exact duplicate of:

• PHP: session variables are overwritten by declared variables with same name 1 answer

Below is a simple test code that I've produced from a bug I am facing right now.

session_start();  
if(isset($_SESSION['views']))
$_SESSION['views'] = $_SESSION['views']+ 1;
else
$_SESSION['views'] = 1;

$views = "hi";
echo "views = ". $_SESSION['views']; 

from what i believe $views and $_SESSION['views'] are completely different things. On a local test the script gives proper response first time 1 then 2 and then 3 and on and on.

The bug only exist on ipage hosting, there the same code gives output hi each time.

What am i missing?

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Answer 1

Yes, in theory $views and $_SESSION['views'] should be completely different things. However, there used to be a setting called register_globals in PHP. It has been marked as deprecated in version 5.3.0 and was removed from version 5.4.0, but people were using that quite a lot, because then you don't have to worry about superglobals and all that more involved stuff and can instead just type pretty much whatever you want.

Anyway. Try to find out if your host is using an older version of PHP and if this function is activated on the server. I bet it is. Easiest way to do it: put the following script on the server and search for register_globals:

<?php
phpinfo();