Stalker_RED

isset($_POST["action"]) && !empty($_POST["action"])

var fso = new ActiveXObject("Scripting.FileSystemObject");

var filePath = "C:\\test\\123.ogg";

function doSomething() {
    WScript.Echo("Файл " + filePath + " существует.");
    // Your code here
}

while(true) {
    if (fso.FileExists(filePath)) doSomething();
    WScript.Sleep(3000); // 3 sec
}

$towns = ['moscow','kiev','minsk'];

if(!empty($_COOKIE['utm_campaign']) && in_array($_COOKIE['utm_campaign'], $towns)) {
  // ... your code here
}