Sampling Twitter stream

twitter-stream.php

<?php
$keyword = '';
$username = '';
$password = '';

$ch = curl_init("http://stream.twitter.com/1/statuses/filter.json?track={$keyword}");
curl_setopt_array($ch, array(
  CURLOPT_READFUNCTION => 'read_twitter_stream',
  CURLOPT_USERPWD => '{$username}:{$password}',
  CURLOPT_TIMEOUT => 0
));
curl_exec($ch);

function read_twitter_stream($ch, $data) {
  echo $data;
  return strlen($data);
}