function extract($source)
{
// TODO - should remove this default value
$Bolts_id = Bolts_Registry::get('yahoo_api_Bolts_id');
$curl_handle = curl_init();
$keywords = null;
$all_keywords = null;
$filter = new Bolts_FilterTags();
$noisewords = Bolts_NoiseWords::getAll();
$url = "http://search.yahooapis.com/ContentAnalysisService/V1/termExtraction";
curl_setopt($curl_handle, CURLOPT_URL, $url);
curl_setopt($curl_handle, CURLOPT_CONNECTTIMEOUT, 2);
curl_setopt($curl_handle, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($curl_handle, CURLOPT_POST, 1);
curl_setopt($curl_handle, CURLOPT_POSTFIELDS, "appid=" . $Bolts_id . "&output=php&context=" . urlencode($source));
$buffer = curl_exec($curl_handle);
curl_close($curl_handle);
$results = unserialize($buffer);
if (is_array($results['ResultSet'])) {
if (!is_array($results['ResultSet']['Result'])) {
$all_keywords = array($results['ResultSet']['Result']);
} else {
$all_keywords = $results['ResultSet']['Result'];
}
}
$keywords = array();
if (is_array($all_keywords)) {
foreach ($all_keywords as $keyword) {
// this is probably overkill, but in case I ever need to check for other things, I'm okay.
$errors = 0;
if (in_array($keyword, $noisewords)) {
$errors++;
}
if ($errors == 0) {
$keywords[] = $filter->filter($keyword);
}
}
}
return $keywords;
}
static function makeTagArray($tag_string)
{
$tags = explode(',', $tag_string);
$tag_filter = new Bolts_FilterTags();
$tag_array = array();
foreach ($tags as $tag) {
if (trim($tag) != "" and $tag != "none" and !is_null($tag)) {
$tag = $tag_filter->filter($tag);
if (!in_array($tag, $tag_array)) {
$tag_array[] = $tag;
}
}
}
return $tag_array;
}
