Possible Duplicate:
Check whether user has my chrome extension installed
is there any easy way to display a div for users that have an chrome extension installed and different div for users that dont have, something like this:
<div>X Chrome Extension is installed</div>
<div>X Chrome Extension is not isntalled</div>
php or javascript something.
That’s not possible. You can’t get a simple list via JavaScript.
You could only check for things which specific extensions introduce (e.g. new DOM elements, etc.).
You cannot accomplish any client-side checks with PHP because it is interpreted and run on the server side.