问如何使用CURL而不是file_get_contents重写这个RSS Reader？

EN

<?php
$siteName = empty($_GET['siteName']) ? 'Website' : $_GET['siteName'];
$siteList = array(
'Website2',
'Website3',
'Website4',
'Website5',
'Website6',
);
// For security.
if ( !in_array($siteName, $siteList) ) {
$siteName = 'Website';
}
$location = "http://query.yahooapis.com/v1/public/yql?q=";
$location .= urlencode("SELECT * FROM feed where url='http://feeds.feedburner.com/$siteName'");
$location .= "&format=json";
$rss = file_get_contents($location, true);
$rss = json_decode($rss);
?> 

$location = "http://query.yahooapis.com/v1/public/yql?q=";
$location .= urlencode("SELECT * FROM feed where url='http://feeds.feedburner.com/$siteName'");
$location .= "&format=json";

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $location);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true );
curl_setopt($ch, CURLOPT_POST, true );
curl_setopt($ch, CURLOPT_POSTFIELDS, trim($request)); 
$rss = curl_exec($ch);
curl_close($ch); 

$rss = json_decode($rss);