function khanacad_query($terms, $tags, $xml)
{
global $CONFIG;
profiling_start('khanacad_query');
$MATCH_LIMIT_TYPE = 'number';
// number | percent
$NMATCHES = 4;
$MATCHPCT = 10;
// 10% of matches
$QLIMIT = 0;
//1.1;
$terms = array_merge($terms, $tags);
$TERMS = implode(' ', $terms);
$store = array();
foreach ($xml as $key => $elem) {
if ($elem['tag'] == 'SUBJECT') {
$t = $elem['attributes']['TITLE'];
//$lt = count(preg_split("/\s+|\+/",$t));
$ltitle = count($t);
$lterms = count($terms);
$matches = count_matches(explode(' ', $t), $terms);
array_push($store, array('matches' => $matches, 'title' => $t, 'url' => $elem['attributes']['LINK']));
}
}
usort($store, function ($a, $b) {
return $a['matches'] > $b['matches'] ? -1 : 1;
});
$ret = array();
//for($i=0; $i<min($NMATCHES,count($store)); $i++)
// array_push($ret, array('title'=>$store[$i]['title'], 'url'=>$store[$i]['url']));
foreach ($store as $s) {
if (($MATCH_LIMIT_TYPE == 'number' && count($ret) < $NMATCHES || $MATCH_LIMIT_TYPE == 'percent' && count($ret) / count($store) < $MATCHPCT / 100) && $s['matches'] >= $QLIMIT) {
$title = $s['title'];
//if($CONFIG['debug']) $title .= "<b> -- quality: ".$s['matches']." terms: ".$TERMS."</b>";
array_push($ret, array('source' => 'khanacad', 'title' => $title, 'url' => "http://www.khanacademy.org{$s['url']}", 'rating' => $s['matches']));
}
}
usort($ret, function ($a, $b) {
return strnatcasecmp($a['title'], $b['title']);
});
profiling_end('khanacad_query');
return $ret;
}
function youtube_query($TERMS, $srch, $crs)
{
global $CONFIG;
profiling_start('youtube_query');
$TAGS = $srch;
$rtags = get_full_tags($crs);
$str = urlencode($TERMS);
//."+".implode("+", $srch);
$url = "http://gdata.youtube.com/feeds/api/videos?q={$str}&orderby=relevance&start-index=1&max-results=2&v=2&format=5";
$data = cached_file_get_contents($url);
$parser = xml_parser_create();
xml_parse_into_struct($parser, $data, $xml);
xml_parser_free($parser);
$store = array();
foreach ($xml as $elem) {
switch ($elem['tag']) {
case 'MEDIA:THUMBNAIL':
$content['thumbnail_url'] = $elem['attributes']['URL'];
$content['thumbnail_width'] = $elem['attributes']['WIDTH'];
$content['thumbnail_height'] = $elem['attributes']['HEIGHT'];
break;
case 'MEDIA:PLAYER':
$content['link'] = $elem['attributes']['URL'];
break;
case 'CONTENT':
if ($elem['attributes']['TYPE'] == 'application/x-shockwave-flash') {
$val = $elem['attributes']['SRC'];
} else {
continue 2;
}
$content['src'] = $val;
break;
case 'MEDIA:CATEGORY':
if ($val != 'Howto' && $val != 'Education' && $val != 'News' && $val != 'Tech') {
continue 2;
} else {
if ($val == 'Education') {
$content['rating'] += 5;
}
}
$val = $elem['value'];
$content[strtolower($elem['tag'])] = $val;
break;
case 'CATEGORY':
if ($elem['attributes']['SCHEME'] != 'http://gdata.youtube.com/schemas/2007/categories.cat') {
continue 2;
} else {
$val = $elem['attributes']['TERM'];
if ($val != 'Howto' && $val != 'Education' && $val != 'News' && $val != 'Tech') {
continue 2;
} else {
if ($val == 'Education') {
$content['rating'] += 5;
}
}
$content[strtolower($elem['tag'])] = $val;
}
break;
case 'MEDIA:KEYWORDS':
$val = $elem['value'];
if (!$val) {
continue 2;
}
if ($rtags) {
$matches = count_matches(explode(', ', $val), explode(',', $rtags));
} else {
$matches = false;
}
if ($matches > 0) {
$content[strtolower($elem['tag'])] = $val;
$content['rating'] += 5;
} else {
$content['rating'] -= 5;
continue 2;
}
break;
case 'MEDIA:DESCRIPTION':
// YT:RATING : attributes : NUMDISLIKES, NUMLIKES
$val = $elem['value'];
if ($rtags) {
$matches = count_matches(explode(' ', $val), explode(',', $rtags));
} else {
$matches = false;
}
if ($matches && $matches > 0) {
$content[strtolower($elem['tag'])] = $val;
$content['rating'] += 2;
} else {
$content['rating'] -= 2;
continue 2;
}
break;
case 'TITLE':
$val = $elem['value'];
$content[strtolower($elem['tag'])] = $val;
break;
case 'ENTRY':
if ($elem['type'] == 'open') {
$content = array('src' => false, 'title' => false, 'media:keywords' => false, 'media:description' => false, 'category' => false, 'rating' => 10, 'thumbnail_url' => false, 'thumbnail_width' => false, 'thumbnail_height' => false, 'link' => false, 'source' => 'youtube');
} else {
if ($elem['type'] == 'close') {
if ($content['rating'] > 8) {
if ($CONFIG['debug']) {
$content['title'] .= ' - rating=' . $content['rating'];
}
array_push($store, $content);
}
}
}
default:
}
}
profiling_end('youtube_query');
return $store;
}
