Geowhy comments feed via Yahoo Pipes

<?php
$apc_key = 'geowhycommentsrss';
$life = 600;
$api = 'http://pipes.yahoo.com/tsing/geowhycomments?_render=rss';
$timeout = 2;

header("Cache-Control: max-age=$life");

if (! function_exists('apc_fetch')) {
    function apc_fetch($key) {
        return false;
    }

    function apc_store($key, $var, $ttl = 0) {
        return false;
    }
}

$content = apc_fetch($apc_key);
if ($content === false) {
    $ch = curl_init($api);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
    curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);
    curl_setopt($ch, CURLOPT_FAILONERROR, true);
    $content = curl_exec($ch);
    curl_close($ch);
    if ($content !== false) {
        $content = str_replace("http://pipes.yahoo.com/pipes/pipe.info?_id=67f8bbcd7af7bf95c6e80ed5245d9845", "http://geowhy.org/feed/comments", $content);
        apc_store($apc_key, gzcompress($content, 9), $life);
    }
} else {
    $content = gzuncompress($content);
    header("Via: GWCache");
}

echo $content;
?>