Gazelle/sections/artist/autocomplete.php

<?
if (empty($_GET['query'])) {
	error(0);
}
header('Content-Type: application/json; charset=utf-8');

$FullName = rawurldecode($_GET['query']);

$MaxKeySize = 4;
if (strtolower(substr($FullName,0,4)) == 'the ') {
	$MaxKeySize += 4;
}
$KeySize = min($MaxKeySize,max(1,strlen($FullName)));

$Letters = strtolower(substr($FullName,0,$KeySize));
$AutoSuggest = $Cache->get('autocomplete_artist_'.$KeySize.'_'.$Letters);

if (!$AutoSuggest) {
	$Limit = (($KeySize === $MaxKeySize) ? 250 : 10);
	$DB->query("
		SELECT
			a.ArtistID,
			a.Name
		FROM artists_group AS a
			INNER JOIN torrents_artists AS ta ON ta.ArtistID=a.ArtistID
			INNER JOIN torrents AS t ON t.GroupID=ta.GroupID
		WHERE a.Name LIKE '".db_string(str_replace('\\','\\\\',$Letters),true)."%'
		GROUP BY ta.ArtistID
		ORDER BY t.Snatched DESC
		LIMIT $Limit");
	$AutoSuggest = $DB->to_array(false,MYSQLI_NUM,false);
	$Cache->cache_value('autocomplete_artist_'.$KeySize.'_'.$Letters,$AutoSuggest,1800 + 7200 * ($MaxKeySize - $KeySize)); // Can't cache things for too long in case names are edited
}

$Matched = 0;
$ArtistIDs = array();
$Response = array(
	'query' => $FullName,
	'suggestions' => array()
);
foreach ($AutoSuggest as $Suggestion) {
	list($ID, $Name) = $Suggestion;
	if (stripos($Name, $FullName) === 0) {
		$Response['suggestions'][] = array('value' => $Name, 'data' => $ID);
		if (++$Matched > 9) {
			break;
		}
	}
}
echo json_encode($Response);