PHP: make the cookies work globally on all subdomains

To make cookies work globally on subdomains of a domain: setcookie('CookieName', 'Value', time() + 3600, '/', '.mydomain.com'); Note: remember to use the dot (.) in '.mydomain.com' not 'mydomain.com'

Javascript: dealing with cookies

function createCookie(name,value,days) { if (days) { var date = new Date(); date.setTime(date.getTime()+(days*24*60*60*1000)); var expires = "; expires="+date.toGMTString(); } else var expires = ""; document.cookie = name+"="+value+expires+"; path=/"; } function readCookie(name) { var nameEQ = name + "="; var ca = document.cookie.split(';'); for(var i=0;i < ca.length;i++) { var c = ca[i]; while (c.charAt(0)==' ') c = …