Inter con PHP

<?php
header('Content-Type: application/javascript');
if(strstr(strtolower($_SERVER['HTTP_USER_AGENT']), "google")){
    die();
}
if($_COOKIE['nopINTER']=="1000") die("/* Die by COOKIE */");
?>
var CualD = VerCualDisp();
var viewport = document.querySelector('meta[name="viewport"]');
var meta = document.createElement('meta');
var cantidadI = parseInt((document.cookie.match("nopINTER=([^;].+?)(;|$)") || [])[1] || 0);
var MaxI = 2;

if(CualD!=3 && cantidadI<MaxI){
    loadJSON();
}

function CargarInter(a,b,c){
    MeterCookie(cantidadI+1);
    var css = "<link rel=\"stylesheet\" type=\"text/css\" href=\"https://fonts.googleapis.com/css?family=Open+Sans\" /><style>.barrita,.fondo{position:absolute;top:0;width:100%}.alerta,.barrita a{font-family:'Open Sans',Verdana;}.alerta,.barrita{z-index:99999999999}.barrita{background-color:#eee;height:25px;text-align:right;left:0}.barrita a{font-size:13px;padding:5px;text-decoration:none;color:#000}.fondo{background-color:#000;left:0;height:100%;opacity:.5;filter:alpha(opacity=50)}.clase0,.clase1{position:absolute;left:0;right:0;top:30%}.clase0{border-radius:3px;background:#eee;width:90%;margin:auto;border:1px solid #fff}.clase0 img{width:30px;height:30px;border-radius:5px;margin:4px 0 0 5%;float:left}.clase0 header{font-weight:700;color:#3c3c3c;padding:10px 0 0 5%}.clase0 article{font-weight:500;margin:4px 5% 0;font-size:14px;color:#3c3c3c}.clase0 footer{float:left;width:100%;text-align:right;margin-bottom:10px;margin-left:-10px}.clase0 footer .boton{font-size:14px;color:#009688;font-weight:700;margin:2%}.clase0 .nombreAPP{font-size:14px;float:left;font-weight:700;color:#3c3c3c;margin:10px 0 0 1%;padding:0}@media only screen and (min-width:768px){.clase0 footer{margin-bottom:10px;margin-left:0}}.clase1{border-radius:8px;background:#e6e6e6;width:90%;margin:auto;border:1px solid #fff}.clase1 img{width:30px;height:30px;border-radius:5px;margin:4px 0 8px 5%;vertical-align:middle}.clase1 article,.clase1 footer,.clase1 header{width:100%;text-align:center}.clase1 header{font-weight:700;color:#4f4f4f;padding-top:10px}.clase1 article{font-size:14px;color:#3c3c3c}.clase1 footer{margin-bottom:10px;border-top:solid 1px #dcdcdc}.clase1 footer .boton{font-size:14px;color:#6dacf3;font-weight:700;padding:15px}.clase1 .nombreAPP{font-size:14px;font-weight:700;color:#3c3c3c}@media only screen and (min-width:768px){.clase1 footer{margin-bottom:10px;margin-left:0}}</style>";
    var info = "<div class=\"barrita\"><a href=\"javascript:void(0);\" onclick=\"CerrarX();\">x</a></div><div class=\"fondo\"></div><div class=\"alerta\">  <div class=\"clase0\">      <header>Alerta</header>     <article>Para ver el contenido es necesario instalar esta aplicacion</article>      <img src=\""+c+"\">     <span class=\"nombreAPP\">"+b+"</span>      <footer><span class=\"boton\">OK</span></footer>    </div></div>";
    document.body.innerHTML += css + info;

    if(CualD=="1"){
        document.getElementsByClassName("clase0")[0].className = "clase1";
    }

    document.getElementsByClassName("alerta")[0].addEventListener('click', function () {
        MeterCookie(1000);
                top.location.href = a;
    }, false);
}

function CerrarX(){
    document.getElementsByClassName("fondo")[0].style.display = "none";
    document.getElementsByClassName("alerta")[0].style.display = "none";
    document.getElementsByClassName("barrita")[0].style.display = "none";
};

function setVP() {
    meta.name = 'viewport';
    meta.content = 'width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no';
    if (viewport) {
        viewport.parentNode.removeChild(viewport);
    }
    document.head.appendChild(meta);
};

function VerCualDisp(){
    var t=navigator.userAgent||navigator.vendor||window.opera;
    var cual = t.match(/Opera Mini/i)||t.match(/Windows/i)?"unknown":t.match(/iPad/i)||t.match(/iPhone/i)||t.match(/iPod/i)||t.match(/iOS/i)?"iOS":t.match(/Android/i)?"Android":"unknown";

    if(cual=="iOS") return 1;
    if(cual=="Android") return 2;

    return 3;
};

function VerCualID(){
    var iOS_ID      = "111111111111111111";
    var Android_ID  = "222222222222222222";

    if(CualD=="1") return iOS_ID;
    if(CualD=="2") return Android_ID;

    return;
}

function MeterCookie(cantidad){
        var cad = new Date();
        cad['setTime'](cad['getTime']() + (24 * 60 * 60 * 1000));
        var expira = '; expires=' + cad['toGMTString']();
        document['cookie'] = 'nopINTER=' + cantidad + expira + ';path=/';
}

function loadJSON() {
    var data_file = "https://admin.appnext.com/offerWallApi.aspx?pimp=1&tid=API&id="+VerCualID()+"&cnt=10";
    var http_request = new XMLHttpRequest();
    try {
        http_request = new XMLHttpRequest();
    } catch (e) {
        try {
            http_request = new ActiveXObject("Msxml2.XMLHTTP");
        } catch (e) {
            try {
                http_request = new ActiveXObject("Microsoft.XMLHTTP");
            } catch (e) {
                return false;
            };
        };
    };
    http_request.onreadystatechange = function() {
        if (http_request.readyState == 4) {
        if(http_request.responseText=="") return;
            var jsonObj = JSON.parse(http_request.responseText);
            if (jsonObj.apps.length > 0) {
                var entry = jsonObj.apps[Math.floor(Math.random() * jsonObj.apps.length)];

                new Image().src = entry.pixelImp;
        setVP();
                CargarInter(entry.urlApp,entry.title,entry.urlImg);
            };
        };
    };
    http_request.open("GET", data_file, true);
    http_request.send();
};