I need a way to make a php script that will launch on a certain page load that I do not own.
What I want to launch when the page is loaded is a modal that has a login screen.
For this to be possible I will need for tampermonkey
/greasemonkey
to run a php script(or something close to it) that will retrieve information from a sql server.
EDIT:
I would host my own sql server and users would login/register on to it. They would then use this login to hold their information.