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<?php
/**
* Elgg geo-location tagging library.
*
* @package Elgg.Core
* @subpackage Location
*/
/**
* Encode a location into a latitude and longitude, caching the result.
*
* Works by triggering the 'geocode' 'location' plugin
* hook, and requires a geocoding plugin to be installed.
*
* @param string $location The location, e.g. "London", or "24 Foobar Street, Gotham City"
* @return string|false
*/
function elgg_geocode_location($location) {
global $CONFIG;
if (is_array($location)) {
return false;
}
$location = sanitise_string($location);
// Look for cached version
$query = "SELECT * from {$CONFIG->dbprefix}geocode_cache WHERE location='$location'";
$cached_location = get_data_row($query);
if ($cached_location) {
return array('lat' => $cached_location->lat, 'long' => $cached_location->long);
}
// Trigger geocode event if not cached
$return = false;
$return = elgg_trigger_plugin_hook('geocode', 'location', array('location' => $location), $return);
// If returned, cache and return value
if (($return) && (is_array($return))) {
$lat = (float)$return['lat'];
$long = (float)$return['long'];
// Put into cache at the end of the page since we don't really care that much
$query = "INSERT DELAYED INTO {$CONFIG->dbprefix}geocode_cache "
. " (location, lat, `long`) VALUES ('$location', '{$lat}', '{$long}')"
. " ON DUPLICATE KEY UPDATE lat='{$lat}', `long`='{$long}'";
execute_delayed_write_query($query);
}
return $return;
}
/**
* Return entities within a given geographic area.
*
* Also accepts all options available to elgg_get_entities().
*
* @see elgg_get_entities
*
* @param array $options Array in format:
*
* latitude => FLOAT Latitude of the location
*
* longitude => FLOAT Longitude of the location
*
* distance => FLOAT/ARR (
* latitude => float,
* longitude => float,
* )
* The distance in degrees that determines the search box. A
* single float will result in a square in degrees.
* @warning The Earth is round.
*
* @see ElggEntity::setLatLong()
*
* @return array
* @since 1.8.0
*/
function elgg_get_entities_from_location(array $options = array()) {
global $CONFIG;
if (!isset($options['latitude']) || !isset($options['longitude']) ||
!isset($options['distance'])) {
return false;
}
if (!is_array($options['distance'])) {
$lat_distance = (float)$options['distance'];
$long_distance = (float)$options['distance'];
} else {
$lat_distance = (float)$options['distance']['latitude'];
$long_distance = (float)$options['distance']['longitude'];
}
$lat = (float)$options['latitude'];
$long = (float)$options['longitude'];
$lat_min = $lat - $lat_distance;
$lat_max = $lat + $lat_distance;
$long_min = $long - $long_distance;
$long_max = $long + $long_distance;
$where = array();
$wheres[] = "lat_name.string='geo:lat'";
$wheres[] = "lat_value.string >= $lat_min";
$wheres[] = "lat_value.string <= $lat_max";
$wheres[] = "lon_name.string='geo:long'";
$wheres[] = "lon_value.string >= $long_min";
$wheres[] = "lon_value.string <= $long_max";
$joins = array();
$joins[] = "JOIN {$CONFIG->dbprefix}metadata lat on e.guid=lat.entity_guid";
$joins[] = "JOIN {$CONFIG->dbprefix}metastrings lat_name on lat.name_id=lat_name.id";
$joins[] = "JOIN {$CONFIG->dbprefix}metastrings lat_value on lat.value_id=lat_value.id";
$joins[] = "JOIN {$CONFIG->dbprefix}metadata lon on e.guid=lon.entity_guid";
$joins[] = "JOIN {$CONFIG->dbprefix}metastrings lon_name on lon.name_id=lon_name.id";
$joins[] = "JOIN {$CONFIG->dbprefix}metastrings lon_value on lon.value_id=lon_value.id";
// merge wheres to pass to get_entities()
if (isset($options['wheres']) && !is_array($options['wheres'])) {
$options['wheres'] = array($options['wheres']);
} elseif (!isset($options['wheres'])) {
$options['wheres'] = array();
}
$options['wheres'] = array_merge($options['wheres'], $wheres);
// merge joins to pass to get_entities()
if (isset($options['joins']) && !is_array($options['joins'])) {
$options['joins'] = array($options['joins']);
} elseif (!isset($options['joins'])) {
$options['joins'] = array();
}
$options['joins'] = array_merge($options['joins'], $joins);
return elgg_get_entities_from_relationship($options);
}
/**
* Returns a viewable list of entities from location
*
* @param array $options
*
* @see elgg_list_entities()
* @see elgg_get_entities_from_location()
*
* @return string The viewable list of entities
* @since 1.8.0
*/
function elgg_list_entities_from_location(array $options = array()) {
return elgg_list_entities($options, 'elgg_get_entities_from_location');
}
// Some distances in degrees (approximate)
// @todo huh? see warning on elgg_get_entities_from_location()
define("MILE", 0.01515);
define("KILOMETER", 0.00932);
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