如何使用Twitter API仅针对每个请求获取新推文？

Question

I'm trying to get new tweets containing some hashtag from Twitter API. The thing I'm interested in is the number of new tweets each time I request the results. So like this:

10:20 AM: 100 tweets containing #google 
10:22 AM: 130 tweets containing #google

But right now somehow my results stay the same. This is my code:

PHP (tweets.php):

<?php 

$json = file_get_contents('http://search.twitter.com/search.json?q=%23apple:)&include_entities=true&rpp=100', true);
echo $json;
?> 

Javascript:

function getTweets() {
    var tweets = 0;
    $.ajax({
        url: "tweets.php",
        crossDomain: true,
        dataType: 'JSON'
        }).done(function(data) {
            $.each( data.results, function( key, value ) {
                console.log(value.entities);
                tweets++;

            });

    });
}
$(document).ready(function() {

    setInterval("getTweets()", 5000);

});

How can I get only the updates?

EDIT: My code works, but the results are not really updates. They are just the same results over and over again.

Answer 1

$(document).ready(function() {

    setInterval(function(){ getTweets();}, 5000);

});