Showing something for 120 seconds

I need to show something on all pages on a site for 120 seconds after the user hits the site

I am setting a session up with

session_start();

if(!isset($_SESSION['phonecookie'])){
    $_SESSION['phonecookie'] = array("expire"=>time()+60*2);
}

then to display the content I am using this on all of the pages.

session_start(); //if not already called with the above statement

if(isset($_SESSI开发者_开发知识库ON['phonecookie']['expire'])){
    if($_SESSION['phonecookie']['expire'] >= time()){
        echo "the content";
    }
} 

for some reason on refresh of a page it keeps changing the value of the phonecookie session value even though I am only generating the phonecookie session value if it doest exist.

isset() checks whether a variable exists. $_SESSION behaves like an array. I would advise to use one of these:

if (!empty($_SESSION['phonecookie']['expire']) {}

or

if (array_key_exists('expire', $_SESSION['phonecookie'])) {}