Twitter feed not working – API issue?

My twitter feed on my website is not working. It reads “Twitter is not responding.” I’m certain this is an API issue, but don’t know how to fix. It is not a widget, instead this is a Twitter feed that is build into the template sidebar PHP code. Unfortunately, the place where I got the template from does not provide support.

Does anyone know what I should do to edit the code?

<!–the twitter widget–>
<div id=”twitter-entry”>
<?php
$url = ‘http://api.twitter.com/1/statuses/user_timeline.json?screen_name=&#8217; . $apa_Twitter . ‘&count=1’;
$json = @file_get_contents($url);
if($json === FALSE){
echo “<p>Twitter is not responding.</p>”;
}else{
$twitterdata = json_decode($json, true);
$pattern = ‘/@([a-zA-Z]+)/’;
$replace = ‘@1‘;
$output = preg_replace($pattern,$replace,$twitterdata[0][“text”]);
$output = make_clickable($output);
echo ‘<p>’ . $output . ‘</p>’;
}
?>
</div><!–twitter widget–>