If you want to load PHP file through AJAX use the below code.
function sendAJAX(){
$('#container').load(
"stuff.php", // url
{ // json object of data to pass to the page
stuff: "all your stuff goes in here...",
moreStuff: "even more stuff"
});
console.log('sendAJAX');
};
Let me know, In case of any doubts.