JS PHP
(simple example)
var last = 0; function poll () { SEND LAST UPDATED TIMESTAMP let data = new FormData(); data.append("last", last);
AJAX FETCH & LOOP fetch("SCRIPT.PHP", {method:"POST", body:data}) .then(res => res.json()).then(data => { console.log(data); last = data.time; poll(); }).catch(e => poll()); }
START poll();
SET TIME LIMIT set_time_limit(30); ignore_user_abort(false);
RESPOND ONLY ON UPDATE while (true) { $data = getData(); if ($data["time"] > $_POST["last"]) { echo json_encode($data); break; } sleep(1); }