javascript - Js check login from exterior website -

javascript - Js check login from exterior website -

i've create "like" button facebook. button on many web sites, calls javascript file hosted me, handle hover/click/etc.. action of button.

now, how can check if user logged or not in website (php sessions) js? if user logged button alter text , shows user liked it, otherwise user redirected(maybe popup) on registration page.

how can handle type of cross-domain(js/ajax) request?

to enable cross-domain requests, add together

header("access-control-allow-origin : *")

to top of php file.

then :

<?php if(isset($_session['user_logged_in']){ echo "true"; } else{ echo "false"; }

and take action on page based on value returned.

javascript php ajax