WordPress is installing a PHPSESSID cookie as soon as someone lands on my site. Under new EU law if its non-essential i have to block it so that a user can opt-in. But if it is essential its ok as long as I detail its use on my site. This is the problem.
I look after about 20 WordPress sites and only 2 of them install a PHPSESSID cookie immediately.
I cant see why. Its definitely not caused by any of my more unusual code or any of the plugins as I have stripped it down to its barebones and its still doing it.
I know WordPress is installing it and I assume it's essential (which will mean it's ok according to the new directive) but I still need to detail it on my cookies page.
But I dont know what it is and cant find anything on the web :(
Both of the sites affected don't give the option for login. Whereas a load of the others do and they don't install that cookie so I have no idea what its purpose is.
Can anyone say what this cookie does and why only 2 of my sites are installing it into the browser?
Both use latest version of WP and there is nothing like an ecommerce element in either site.