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<?php
/**
* Elgg tags
* Functions for managing tags and tag clouds.
*
* @package Elgg
* @subpackage Core
* @author Curverider Ltd <info@elgg.com>
* @link http://elgg.org/
*/
/**
* The algorithm working out the size of font based on the number of tags.
* This is quick and dirty.
*/
function calculate_tag_size($min, $max, $number_of_tags, $buckets = 6)
{
$delta = (($max - $min) / $buckets);
$thresholds = array();
for ($n=1; $n <= $buckets; $n++) {
$thresholds[$n-1] = ($min + $n) * $delta;
}
// Correction
if ($thresholds[$buckets-1]>$max) $thresholds[$buckets-1] = $max;
$size = 0;
for ($n = 0; $n < count($thresholds); $n++) {
if ($number_of_tags >= $thresholds[$n])
$size = $n;
}
return $size;
}
/**
* This function generates an array of tags with a weighting.
*
* @param array $tags The array of tags.
* @return An associated array of tags with a weighting, this can then be mapped to a display class.
*/
function generate_tag_cloud(array $tags, $buckets = 6)
{
$cloud = array();
$min = 65535;
$max = 0;
foreach ($tags as $tag)
{
$cloud[$tag]++;
if ($cloud[$tag]>$max) $max = $cloud[$tag];
if ($cloud[$tag]<$min) $min = $cloud[$tag];
}
foreach ($cloud as $k => $v)
$cloud[$k] = calculate_tag_size($min, $max, $v, $buckets);
return $cloud;
}
/**
* Get an array of tags with weights for use with the output/tagcloud view.
*
* @param int $threshold Get the threshold of minimum number of each tags to bother with (ie only show tags where there are more than $threshold occurances)
* @param int $limit Number of tags to return
* @param string $metadata_name Optionally, the name of the field you want to grab for
* @param string $entity_type Optionally, the entity type ('object' etc)
* @param string $entity_subtype The entity subtype, optionally
* @param int $owner_guid The GUID of the tags owner, optionally
* @param int $site_guid Optionally, the site to restrict to (default is the current site)
* @param int $start_ts Optionally specify a start timestamp for tags used to generate cloud.
* @param int $ent_ts Optionally specify an end timestamp for tags used to generate cloud.
* @return array|false Array of objects with ->tag and ->total values, or false on failure
*/
function get_tags($threshold = 1, $limit = 10, $metadata_name = "", $entity_type = "object", $entity_subtype = "", $owner_guid = "", $site_guid = -1, $start_ts = "", $end_ts = "") {
global $CONFIG;
$threshold = (int) $threshold;
$limit = (int) $limit;
if (!empty($metadata_name)) {
$metadata_name = (int) get_metastring_id($metadata_name);
} else {
$metadata_name = 0;
}
$entity_subtype = get_subtype_id($entity_type, $entity_subtype);
$entity_type = sanitise_string($entity_type);
if ($owner_guid != "")
if (is_array($owner_guid)) {
foreach($owner_guid as $key => $val)
$owner_guid[$key] = (int) $val;
} else {
$owner_guid = (int) $owner_guid;
}
if ($site_guid < 0) {
$site_guid = $CONFIG->site_id;
}
//$access = get_access_list();
$query = "SELECT msvalue.string as tag, count(msvalue.id) as total ";
$query .= "FROM {$CONFIG->dbprefix}entities e join {$CONFIG->dbprefix}metadata md on md.entity_guid = e.guid ";
if ($entity_subtype > 0)
$query .= " join {$CONFIG->dbprefix}entity_subtypes subtype on subtype.id = e.subtype ";
$query .= " join {$CONFIG->dbprefix}metastrings msvalue on msvalue.id = md.value_id ";
$query .= " where msvalue.string != '' ";
if ($metadata_name > 0) {
$query .= " and md.name_id = {$metadata_name} ";
}
if ($site_guid > 0) {
$query .= " and e.site_guid = {$site_guid} ";
}
if ($entity_subtype > 0) {
$query .= " and e.subtype = {$entity_subtype} ";
}
if ($entity_type != "") {
$query .= " and e.type = '{$entity_type}' ";
}
if (is_array($owner_guid)) {
$query .= " and e.container_guid in (".implode(",",$owner_guid).")";
} else if (is_int($owner_guid)) {
$query .= " and e.container_guid = {$owner_guid} ";
}
if ($start_ts) {
$start_ts = (int)$start_ts;
$query .= " and e.time_created>=$start_ts";
}
if ($end_ts) {
$end_ts = (int)$end_ts;
$query .= " and e.time_created<=$end_ts";
}
//$userid = get_loggedin_userid();
//$query .= " and (e.access_id in {$access} or (e.access_id = " . ACCESS_PRIVATE . " and e.owner_guid = {$userid}))";
$query .= ' and ' . get_access_sql_suffix("e"); // Add access controls
$query .= " group by msvalue.string having total > {$threshold} order by total desc limit {$limit} ";
return get_data($query);
}
/**
* Loads and displays a tagcloud given particular criteria.
*
* @param int $threshold Get the threshold of minimum number of each tags to bother with (ie only show tags where there are more than $threshold occurances)
* @param int $limit Number of tags to return
* @param string $metadata_name Optionally, the name of the field you want to grab for
* @param string $entity_type Optionally, the entity type ('object' etc)
* @param string $entity_subtype The entity subtype, optionally
* @param int $owner_guid The GUID of the tags owner, optionally
* @param int $site_guid Optionally, the site to restrict to (default is the current site)
* @return string THe HTML (or other, depending on view type) of the tagcloud.
*/
function display_tagcloud($threshold = 1, $limit = 10, $metadata_name = "", $entity_type = "object", $entity_subtype = "", $owner_guid = "", $site_guid = -1) {
return elgg_view("output/tagcloud",array('value' => get_tags($threshold, $limit, $metadata_name, $entity_type, $entity_subtype, $owner_guid, $site_guid),'object' => $entity_type, 'subtype' => $entity_subtype));
}
?>
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