Ernest Fayzullin

$view_2 = isset($_GET['view_2']) ? @intval($_GET['view_2']) : null;

if (!$view_2)
    return false;

...

var element = document.getElementById(id);
fade(element);

$(window.document).on('change', '.selector', function () {
        ...
    });

let str = "Тестовая строка для вставки в буфер обмена",
    button = document.getElementById("some-btn")

button.onclick () {
  document.execCommand("copy");
}

button.addEventListener("copy", (event) => {
  event.preventDefault();
  event.clipboardData.setData("text/plain", str);
});

(function(w) {
    var oldST = w.setTimeout;
    var oldSI = w.setInterval;
    var oldCI = w.clearInterval;
    var timers = [];
    w.timers = timers;
    w.setTimeout = function(fn, delay) {
        var id = oldST(function() {
            fn && fn();
            removeTimer(id);
        }, delay);
        
        return id;
    };
    w.setInterval = function(fn, delay) {
        var id = oldSI(fn, delay);
        timers.push(id);
        return id;
    };
    w.clearInterval = function(id) {
        oldCI(id);
        removeTimer(id);
    };
    w.clearTimeout = w.clearInterval;

    function removeTimer(id) {
        var index = timers.indexOf(id);
        if (index >= 0)
            timers.splice(index, 1);
    }
}(window));