Yahoo! Term Extraction API V1

if (array_key_exists('submit', $_REQUEST)) {

    $url = 'http://search.yahooapis.com/ContentAnalysisService/V1/termExtraction';
    $appid = 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx';
    $output = 'php';

    if (array_key_exists('string', $_REQUEST) && strlen($_REQUEST['string']) > 0) {
        $context = urlencode($_POST['string']);
    } else if (array_key_exists('url', $_REQUEST) && strlen($_REQUEST['url']) > 0) {
        $context = urlencode(strip_tags(file_get_contents($_REQUEST['url'])));
    }

    $context = substr($context, 0, 7000);
    $url = $url . '?appid=' . $appid . '&output=' . $output . '&context=' . $context;

    $ch = curl_init();

    // set URL and other appropriate options
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_HEADER, 0);
    curl_setopt($ch, CURLOPT_HTTPGET, true);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

    // grab URL and pass it to the browser
    $response = curl_exec($ch);

    // close cURL resource, and free up system resources
    curl_close($ch);

    $response = unserialize($response);

    print '
';
    foreach ($response['ResultSet']['Result'] as $key => $term) {
        print '
' . $term . '

';
    }
    print '

';

} else {

    print '
';
    print 'url:
';
    print 'string: ';
    print '


';

}