Sessions and browser's tabs May you have noticed when you open your website in two or more tabs in Firefox, Opera, IE 7.0 or use 'Control+N' in IE 6.0 to open a new window, it is using the same cookie or is passing the same session id, so the another tab is just a copy of the previous tab. What you do in one will affect the another and vice-versa. Even if you open Firefox again, it will use the sa
![PHP: セッション関数 - Manual](https://cdn-ak-scissors.b.st-hatena.com/image/square/4dd02c2555ca1b32548779e23dc3e33a9f46bf13/height=288;version=1;width=512/https%3A%2F%2Fwww.php.net%2Fimages%2Fmeta-image.png)