This is the code to grab tweets, but i need this in PHP, can anybody offer any insight?

$(document).ready( function() {

            var url = "http://twitter.com/status/user_timeline/joebloggs.json?count=1&callback=?";
            $.getJSON(url,
            function(data){
                $.each(data, function(i, item) {
                    $("#twitter-posts").append("<p>" + item.text.linkify() + " <span class='created_at'>" + relative_time(item.created_at) + " via " + item.source + "</span></p>");
                });
            });
        });

        String.prototype.linkify = function() {
            return this.replace(/[A-Za-z]+:\/\/[A-Za-z0-9-_]+\.[A-Za-z0-9-_:%&\?\/.=]+/, function(m) {
        return m.link(m);
      });
     }; 
      function relative_time(time_value) {
          var values = time_value.split(" ");
          time_value = values[1] + " " + values[2] + ", " + values[5] + " " + values[3];
          var parsed_date = Date.parse(time_value);
          var relative_to = (arguments.length > 1) ? arguments[1] : new Date();
          var delta = parseInt((relative_to.getTime() - parsed_date) / 1000);
          delta = delta + (relative_to.getTimezoneOffset() * 60);

          var r = '';
          if (delta < 60) {
            r = 'a minute ago';
          } else if(delta < 120) {
            r = 'couple of minutes ago';
          } else if(delta < (45*60)) {
            r = (parseInt(delta / 60)).toString() + ' minutes ago';
          } else if(delta < (90*60)) {
            r = 'an hour ago';
          } else if(delta < (24*60*60)) {
            r = '' + (parseInt(delta / 3600)).toString() + ' hours ago';
          } else if(delta < (48*60*60)) {
            r = '1 day ago';
          } else {
            r = (parseInt(delta / 86400)).toString() + ' days ago';
          }

          return r;
    }
    function twitter_callback ()
    {
        return true;
    }