title: How to send arrays using XMLHttpRequest to server
body: <p>As I know using ajax you can send data to the server but I'm confused about sending an array to post using <code>XMLHttpRequest</code> not any library like jQuery. My question is that, is that possible to send an array to <code>php</code> using <code>XMLHttpRequest</code> and how does <code>jQuery</code> send an array to php, I mean does jQuery do any additional work to send an array to server (php $_POST) ?</p>