Get tweets from a hashtag

tweets.php

$ch = curl_init('http://search.twitter.com/search.atom?q=' . urlencode($hashtag));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
$answer = curl_exec($ch);
curl_close($ch);
$xml = new SimpleXMLElement($answer);
foreach ($xml->entry as $entry) {
  $id = $entry->id;
  $tweet = trim($entry->title);
  $author = trim($entry->author->name);
  $time = strtotime($entry->published);
}