initializeAttributes(); } /** * Initialize the attributes array. * * This is vital to distinguish between metadata and base parameters. * * @return void */ protected function initializeAttributes() { initialise_entity_cache(); // Create attributes array if not already created if (!is_array($this->attributes)) { $this->attributes = array(); } if (!is_array($this->temp_metadata)) { $this->temp_metadata = array(); } if (!is_array($this->temp_annotations)) { $this->temp_annotations = array(); } if (!is_array($this->volatile)) { $this->volatile = array(); } $this->attributes['guid'] = ""; $this->attributes['type'] = ""; $this->attributes['subtype'] = ""; $this->attributes['owner_guid'] = get_loggedin_userid(); $this->attributes['container_guid'] = get_loggedin_userid(); $this->attributes['site_guid'] = 0; $this->attributes['access_id'] = ACCESS_PRIVATE; $this->attributes['time_created'] = ""; $this->attributes['time_updated'] = ""; $this->attributes['last_action'] = ''; $this->attributes['enabled'] = "yes"; // There now follows a bit of a hack /* Problem: To speed things up, some objects are split over several tables, * this means that it requires n number of database reads to fully populate * an entity. This causes problems for caching and create events * since it is not possible to tell whether a subclassed entity is complete. * * Solution: We have two counters, one 'tables_split' which tells whatever is * interested how many tables are going to need to be searched in order to fully * populate this object, and 'tables_loaded' which is how many have been * loaded thus far. * * If the two are the same then this object is complete. * * Use: isFullyLoaded() to check */ $this->attributes['tables_split'] = 1; $this->attributes['tables_loaded'] = 0; } /** * Clone an entity * * Resets the guid so that the entity can be saved as a distinct entity from * the original. Creation time will be set when this new entity is saved. * The owner and container guids come from the original entity. The clone * method copies metadata but does not copy annotations or private settings. * * @note metadata will have its owner and access id set when the entity is saved * and it will be the same as that of the entity. * * @return void */ public function __clone() { $orig_entity = get_entity($this->guid); if (!$orig_entity) { elgg_log("Failed to clone entity with GUID $this->guid", "ERROR"); return; } $metadata_array = get_metadata_for_entity($this->guid); $this->attributes['guid'] = ""; $this->attributes['subtype'] = $orig_entity->getSubtype(); // copy metadata over to new entity - slightly convoluted due to // handling of metadata arrays if (is_array($metadata_array)) { // create list of metadata names $metadata_names = array(); foreach ($metadata_array as $metadata) { $metadata_names[] = $metadata['name']; } // arrays are stored with multiple enties per name $metadata_names = array_unique($metadata_names); // move the metadata over foreach ($metadata_names as $name) { $this->set($name, $orig_entity->$name); } } } /** * Return the value of a property. * * If $name is defined in $this->attributes that value is returned, otherwise it will * pull from the entity's metadata. * * Q: Why are we not using __get overload here? * A: Because overload operators cause problems during subclassing, so we put the code here and * create overloads in subclasses. * * @todo What problems are these? * * @warning Subtype is returned as an id rather than the subtype string. Use getSubtype() * to get the subtype string. * * @param string $name Name * * @return mixed Returns the value of a given value, or null. */ public function get($name) { // See if its in our base attributes if (isset($this->attributes[$name])) { return $this->attributes[$name]; } // No, so see if its in the meta data for this entity $meta = $this->getMetaData($name); // getMetaData returns NULL if $name is not found return $meta; } /** * Sets the value of a property. * * If $name is defined in $this->attributes that value is set, otherwise it will * set the appropriate item of metadata. * * @warning It is important that your class populates $this->attributes with keys * for all base attributes, anything not in their gets set as METADATA. * * Q: Why are we not using __set overload here? * A: Because overload operators cause problems during subclassing, so we put the code here and * create overloads in subclasses. * * @todo What problems? * * @param string $name Name * @param mixed $value Value * * @return bool */ public function set($name, $value) { if (array_key_exists($name, $this->attributes)) { // Certain properties should not be manually changed! switch ($name) { case 'guid': case 'time_created': case 'time_updated': case 'last_action': return FALSE; break; default: $this->attributes[$name] = $value; break; } } else { return $this->setMetaData($name, $value); } return TRUE; } /** * Return the value of a piece of metadata. * * @param string $name Name * * @return mixed The value, or NULL if not found. */ public function getMetaData($name) { if ((int) ($this->guid) > 0) { $md = get_metadata_byname($this->getGUID(), $name); } else { if (isset($this->temp_metadata[$name])) { return $this->temp_metadata[$name]; } } if ($md && !is_array($md)) { return $md->value; } else if ($md && is_array($md)) { return metadata_array_to_values($md); } return null; } /** * Return an attribute or a piece of metadata. * * @param string $name Name * * @return mixed */ function __get($name) { return $this->get($name); } /** * Set an attribute or a piece of metadata. * * @param string $name Name * @param mixed $value Value * * @return mixed */ function __set($name, $value) { return $this->set($name, $value); } /** * Test if property is set either as an attribute or metadata. * * @tip Use isset($entity->property) * * @param string $name The name of the attribute or metadata. * * @return bool */ function __isset($name) { return $this->$name !== NULL; } /** * Unset a property from metadata or attribute. * * @warning If you use this to unset an attribute, you must save the object! * * @param string $name The name of the attribute or metadata. * * @return void */ function __unset($name) { if (array_key_exists($name, $this->attributes)) { $this->attributes[$name] = ""; } else { $this->clearMetaData($name); } } /** * Set a piece of metadata. * * @tip Plugin authors should use the magic methods. * * @access private * * @param string $name Name of the metadata * @param mixed $value Value of the metadata * @param string $value_type Types supported: integer and string. Will auto-identify if not set * @param bool $multiple Allow multiple values for a single name (doesn't support assoc arrays) * * @return bool */ public function setMetaData($name, $value, $value_type = "", $multiple = false) { if (is_array($value)) { unset($this->temp_metadata[$name]); remove_metadata($this->getGUID(), $name); foreach ($value as $v) { if ((int) $this->guid > 0) { $multiple = true; if (!create_metadata($this->getGUID(), $name, $v, $value_type, $this->getOwner(), $this->getAccessID(), $multiple)) { return false; } } else { if (($multiple) && (isset($this->temp_metadata[$name]))) { if (!is_array($this->temp_metadata[$name])) { $tmp = $this->temp_metadata[$name]; $this->temp_metadata[$name] = array(); $this->temp_metadata[$name][] = $tmp; } $this->temp_metadata[$name][] = $value; } else { $this->temp_metadata[$name] = $value; } } } return true; } else { unset($this->temp_metadata[$name]); if ((int) $this->guid > 0) { $result = create_metadata($this->getGUID(), $name, $value, $value_type, $this->getOwner(), $this->getAccessID(), $multiple); return (bool)$result; } else { if (($multiple) && (isset($this->temp_metadata[$name]))) { if (!is_array($this->temp_metadata[$name])) { $tmp = $this->temp_metadata[$name]; $this->temp_metadata[$name] = array(); $this->temp_metadata[$name][] = $tmp; } $this->temp_metadata[$name][] = $value; } else { $this->temp_metadata[$name] = $value; } return true; } } } /** * Remove metadata * * @warning Calling this with no or empty arguments will clear all metadata on the entity. * * @param string $name The name of the metadata to clear * * @return mixed bool */ public function clearMetaData($name = "") { if (empty($name)) { return clear_metadata($this->getGUID()); } else { return remove_metadata($this->getGUID(), $name); } } /** * Get a piece of volatile (non-persisted) data on this entity. * * @param string $name The name of the volatile data * * @return mixed The value or NULL if not found. */ public function getVolatileData($name) { if (!is_array($this->volatile)) { $this->volatile = array(); } if (array_key_exists($name, $this->volatile)) { return $this->volatile[$name]; } else { return NULL; } } /** * Set a piece of volatile (non-persisted) data on this entity * * @param string $name Name * @param mixed $value Value * * @return void */ public function setVolatileData($name, $value) { if (!is_array($this->volatile)) { $this->volatile = array(); } $this->volatile[$name] = $value; } /** * Remove all relationships to and from this entity. * * @return true * @todo This should actually return if it worked. * @see ElggEntity::addRelationship() * @see ElggEntity::removeRelationship() */ public function clearRelationships() { remove_entity_relationships($this->getGUID()); remove_entity_relationships($this->getGUID(), "", true); return true; } /** * Add a relationship between this an another entity. * * @tip Read the relationship like "$guid is a $relationship of this entity." * * @param int $guid Entity to link to. * @param string $relationship The type of relationship. * * @return bool * @see ElggEntity::removeRelationship() * @see ElggEntity::clearRelationships() */ public function addRelationship($guid, $relationship) { return add_entity_relationship($this->getGUID(), $relationship, $guid); } /** * Remove a relationship * * @param int $guid GUID of the entity to make a relationship with * @param str $relationship Name of relationship * * @return bool * @see ElggEntity::addRelationship() * @see ElggEntity::clearRelationships() */ public function removeRelationship($guid, $relationship) { return remove_entity_relationship($this->getGUID(), $relationship, $guid); } /** * Adds a private setting to this entity. * * Private settings are similar to metadata but will not * be searched and there are fewer helper functions for them. * * @param string $name Name of private setting * @param mixed $value Value of private setting * * @return bool * @link http://docs.elgg.org/DataModel/Entities/PrivateSettings */ function setPrivateSetting($name, $value) { return set_private_setting($this->getGUID(), $name, $value); } /** * Returns a private setting value * * @param string $name Name of the private setting * * @return mixed */ function getPrivateSetting($name) { return get_private_setting($this->getGUID(), $name); } /** * Removes private setting * * @param string $name Name of the private setting * * @return bool */ function removePrivateSetting($name) { return remove_private_setting($this->getGUID(), $name); } /** * Adds an annotation to an entity. * * @warning By default, annotations are private. * * @param string $name Annotation name * @param mixed $value Annotation value * @param int $access_id Access ID * @param int $owner_id GUID of the annotation owner * @param string $vartype The type of annotation value * * @return bool * * @link http://docs.elgg.org/DataModel/Annotations */ function annotate($name, $value, $access_id = ACCESS_PRIVATE, $owner_id = 0, $vartype = "") { if ((int) $this->guid > 0) { return create_annotation($this->getGUID(), $name, $value, $vartype, $owner_id, $access_id); } else { $this->temp_annotations[$name] = $value; } return true; } /** * Returns an array of annotations. * * @param string $name Annotation name * @param int $limit Limit * @param int $offset Offset * @param string $order asc or desc * * @return array */ function getAnnotations($name, $limit = 50, $offset = 0, $order = "asc") { if ((int) ($this->guid) > 0) { return get_annotations($this->getGUID(), "", "", $name, "", 0, $limit, $offset, $order); } else { return $this->temp_annotations[$name]; } } /** * Remove an annotation or all annotations for this entity. * * @warning Calling this method with no or an empty argument will remove * all annotations on the entity. * * @param string $name Annotation name * * @return bool */ function clearAnnotations($name = "") { return clear_annotations($this->getGUID(), $name); } /** * Count annotations. * * @param string $name The type of annotation. * * @return int */ function countAnnotations($name = "") { return count_annotations($this->getGUID(), "", "", $name); } /** * Get the average of an integer type annotation. * * @param string $name Annotation name * * @return int */ function getAnnotationsAvg($name) { return get_annotations_avg($this->getGUID(), "", "", $name); } /** * Get the sum of integer type annotations of a given name. * * @param string $name Annotation name * * @return int */ function getAnnotationsSum($name) { return get_annotations_sum($this->getGUID(), "", "", $name); } /** * Get the minimum of integer type annotations of given name. * * @param string $name Annotation name * * @return int */ function getAnnotationsMin($name) { return get_annotations_min($this->getGUID(), "", "", $name); } /** * Get the maximum of integer type annotations of a given name. * * @param string $name Annotation name * * @return int */ function getAnnotationsMax($name) { return get_annotations_max($this->getGUID(), "", "", $name); } /** * Gets an array of entities with a relationship to this entity. * * @param string $relationship Relationship type (eg "friends") * @param bool $inverse Is this an inverse relationship? * @param int $limit Number of elements to return * @param int $offset Indexing offset * * @return array|false An array of entities or false on failure */ function getEntitiesFromRelationship($relationship, $inverse = false, $limit = 50, $offset = 0) { return elgg_get_entities_from_relationship(array( 'relationship' => $relationship, 'relationship_guid' => $this->getGUID(), 'inverse_relationship' => $inverse, 'limit' => $limit, 'offset' => $offset )); } /** * Gets the number of of entities from a specific relationship type * * @param string $relationship Relationship type (eg "friends") * @param bool $inverse_relationship Invert relationship * * @return int|false The number of entities or false on failure */ function countEntitiesFromRelationship($relationship, $inverse_relationship = FALSE) { return elgg_get_entities_from_relationship(array( 'relationship' => $relationship, 'relationship_guid' => $this->getGUID(), 'inverse_relationship' => $inverse_relationship, 'count' => TRUE )); } /** * Can a user edit this entity. * * @param int $user_guid The user GUID, optionally (default: logged in user) * * @return bool */ function canEdit($user_guid = 0) { return can_edit_entity($this->getGUID(), $user_guid); } /** * Can a user edit metadata on this entity * * @param ElggMetadata $metadata The piece of metadata to specifically check * @param int $user_guid The user GUID, optionally (default: logged in user) * * @return true|false */ function canEditMetadata($metadata = null, $user_guid = 0) { return can_edit_entity_metadata($this->getGUID(), $user_guid, $metadata); } /** * Can a user write to this entity's container. * * @param int $user_guid The user. * * @return bool */ public function canWriteToContainer($user_guid = 0) { return can_write_to_container($user_guid, $this->getGUID()); } /** * Returns the access_id. * * @return int The access ID */ public function getAccessID() { return $this->get('access_id'); } /** * Returns the guid. * * @return int GUID */ public function getGUID() { return $this->get('guid'); } /** * Returns the entity type * * @return string Entity type */ public function getType() { return $this->get('type'); } /** * Returns the entity subtype string * * @note This returns a string. If you want the id, use ElggEntity::subtype. * * @return string The entity subtype */ public function getSubtype() { // If this object hasn't been saved, then return the subtype string. if (!((int) $this->guid > 0)) { return $this->get('subtype'); } return get_subtype_from_id($this->get('subtype')); } /** * Returns the UNIX epoch time that this entity was last updated * * @return int UNIX epoch time */ public function getTimeUpdated() { return $this->get('time_updated'); } /** * Returns the URL for this entity * * @return string The URL * @see register_entity_url_handler() * @see ElggEntity::setURL() */ public function getURL() { if (!empty($this->url_override)) { return $this->url_override; } return get_entity_url($this->getGUID()); } /** * Overrides the URL returned by getURL() * * @warning This override exists only for the life of the object. * * @param string $url The new item URL * * @return string The URL */ public function setURL($url) { $this->url_override = $url; return $url; } /** * Returns a URL for the entity's icon. * * @param string $size Either 'large', 'medium', 'small' or 'tiny' * * @return string The url or false if no url could be worked out. * @see get_entity_icon_url() */ public function getIcon($size = 'medium') { if (isset($this->icon_override[$size])) { return $this->icon_override[$size]; } return get_entity_icon_url($this, $size); } /** * Set an icon override for an icon and size. * * @warning This override exists only for the life of the object. * * @param string $url The url of the icon. * @param string $size The size its for. * * @return bool */ public function setIcon($url, $size = 'medium') { $url = sanitise_string($url); $size = sanitise_string($size); if (!$this->icon_override) { $this->icon_override = array(); } $this->icon_override[$size] = $url; return true; } /** * Tests to see whether the object has been fully loaded. * * @return bool */ public function isFullyLoaded() { return ! ($this->attributes['tables_loaded'] < $this->attributes['tables_split']); } /** * Save attributes to the entities table. * * @return bool * @throws IOException */ public function save() { $guid = (int) $this->guid; if ($guid > 0) { cache_entity($this); return update_entity( $this->get('guid'), $this->get('owner_guid'), $this->get('access_id'), $this->get('container_guid') ); } else { // Create a new entity (nb: using attribute array directly // 'cos set function does something special!) $this->attributes['guid'] = create_entity($this->attributes['type'], $this->attributes['subtype'], $this->attributes['owner_guid'], $this->attributes['access_id'], $this->attributes['site_guid'], $this->attributes['container_guid']); if (!$this->attributes['guid']) { throw new IOException(elgg_echo('IOException:BaseEntitySaveFailed')); } // Save any unsaved metadata // @todo How to capture extra information (access id etc) if (sizeof($this->temp_metadata) > 0) { foreach ($this->temp_metadata as $name => $value) { $this->$name = $value; unset($this->temp_metadata[$name]); } } // Save any unsaved annotations metadata. // @todo How to capture extra information (access id etc) if (sizeof($this->temp_annotations) > 0) { foreach ($this->temp_annotations as $name => $value) { $this->annotate($name, $value); unset($this->temp_annotations[$name]); } } // set the subtype to id now rather than a string $this->attributes['subtype'] = get_subtype_id($this->attributes['type'], $this->attributes['subtype']); // Cache object handle if ($this->attributes['guid']) { cache_entity($this); } return $this->attributes['guid']; } } /** * Loads attributes from the entities table into the object. * * @param int $guid GUID of Entity * * @return bool */ protected function load($guid) { $row = get_entity_as_row($guid); if ($row) { // Create the array if necessary - all subclasses should test before creating if (!is_array($this->attributes)) { $this->attributes = array(); } // Now put these into the attributes array as core values $objarray = (array) $row; foreach ($objarray as $key => $value) { $this->attributes[$key] = $value; } // Increment the portion counter if (!$this->isFullyLoaded()) { $this->attributes['tables_loaded']++; } // Cache object handle if ($this->attributes['guid']) { cache_entity($this); } return true; } return false; } /** * Disable this entity. * * Disabled entities are not returned by getter functions. * To enable an entity, use {@link enable_entity()}. * * Recursively disabling an entity will disable all entities * owned or contained by the parent entity. * * @internal Disabling an entity sets the 'enabled' column to 'no'. * * @param string $reason Optional reason * @param bool $recursive Recursively disable all contained entities? * * @return bool * @see enable_entity() * @see ElggEntity::enable() */ public function disable($reason = "", $recursive = true) { if ($r = disable_entity($this->get('guid'), $reason, $recursive)) { $this->attributes['enabled'] = 'no'; } return $r; } /** * Enable an entity * * @warning Disabled entities can't be loaded unless * {@link access_show_hidden_entities(true)} has been called. * * @see enable_entity() * @see access_show_hiden_entities() * @return bool */ public function enable() { if ($r = enable_entity($this->get('guid'))) { $this->attributes['enabled'] = 'yes'; } return $r; } /** * Is this entity enabled? * * @return boolean */ public function isEnabled() { if ($this->enabled == 'yes') { return true; } return false; } /** * Delete this entity. * * @return bool */ public function delete() { return delete_entity($this->get('guid')); } /* * LOCATABLE INTERFACE */ /** * Sets the 'location' metadata for the entity * * @todo Unimplemented * * @param string $location String representation of the location * * @return true */ public function setLocation($location) { $location = sanitise_string($location); $this->location = $location; return true; } /** * Set latitude and longitude metadata tags for a given entity. * * @param float $lat Latitude * @param float $long Longitude * * @return true * @todo Unimplemented */ public function setLatLong($lat, $long) { $lat = sanitise_string($lat); $long = sanitise_string($long); $this->set('geo:lat', $lat); $this->set('geo:long', $long); return true; } /** * Return the entity's latitude. * * @return int * @todo Unimplemented */ public function getLatitude() { return $this->get('geo:lat'); } /** * Return the entity's longitude * * @return Int */ public function getLongitude() { return $this->get('geo:long'); } /** * Return the entity's location * * @return string */ public function getLocation() { return $this->get('location'); } /* * NOTABLE INTERFACE */ /** * Set the time and duration of an object * * @param int $hour If ommitted, now is assumed. * @param int $minute If ommitted, now is assumed. * @param int $second If ommitted, now is assumed. * @param int $day If ommitted, now is assumed. * @param int $month If ommitted, now is assumed. * @param int $year If ommitted, now is assumed. * @param int $duration Duration of event, remainder of the day is assumed. * * @return true * @todo Unimplemented */ public function setCalendarTimeAndDuration($hour = NULL, $minute = NULL, $second = NULL, $day = NULL, $month = NULL, $year = NULL, $duration = NULL) { $start = mktime($hour, $minute, $second, $month, $day, $year); $end = $start + abs($duration); if (!$duration) { $end = get_day_end($day, $month, $year); } $this->calendar_start = $start; $this->calendar_end = $end; return true; } /** * Returns the start timestamp. * * @return int * @todo Unimplemented */ public function getCalendarStartTime() { return (int)$this->calendar_start; } /** * Returns the end timestamp. * * @todo Unimplemented * * @return int */ public function getCalendarEndTime() { return (int)$this->calendar_end; } /* * EXPORTABLE INTERFACE */ /** * Returns an array of fields which can be exported. * * @return array */ public function getExportableValues() { return array( 'guid', 'type', 'subtype', 'time_created', 'time_updated', 'container_guid', 'owner_guid', 'site_guid' ); } /** * Export this class into an array of ODD Elements containing all necessary fields. * Override if you wish to return more information than can be found in * $this->attributes (shouldn't happen) * * @return array */ public function export() { $tmp = array(); // Generate uuid $uuid = guid_to_uuid($this->getGUID()); // Create entity $odd = new ODDEntity( $uuid, $this->attributes['type'], get_subtype_from_id($this->attributes['subtype']) ); $tmp[] = $odd; $exportable_values = $this->getExportableValues(); // Now add its attributes foreach ($this->attributes as $k => $v) { $meta = NULL; if (in_array( $k, $exportable_values)) { switch ($k) { case 'guid' : // Dont use guid in OpenDD case 'type' : // Type and subtype already taken care of case 'subtype' : break; case 'time_created' : // Created = published $odd->setAttribute('published', date("r", $v)); break; case 'site_guid' : // Container $k = 'site_uuid'; $v = guid_to_uuid($v); $meta = new ODDMetaData($uuid . "attr/$k/", $uuid, $k, $v); break; case 'container_guid' : // Container $k = 'container_uuid'; $v = guid_to_uuid($v); $meta = new ODDMetaData($uuid . "attr/$k/", $uuid, $k, $v); break; case 'owner_guid' : // Convert owner guid to uuid, this will be stored in metadata $k = 'owner_uuid'; $v = guid_to_uuid($v); $meta = new ODDMetaData($uuid . "attr/$k/", $uuid, $k, $v); break; default : $meta = new ODDMetaData($uuid . "attr/$k/", $uuid, $k, $v); } // set the time of any metadata created if ($meta) { $meta->setAttribute('published', date("r", $this->time_created)); $tmp[] = $meta; } } } // Now we do something a bit special. /* * This provides a rendered view of the entity to foreign sites. */ elgg_set_viewtype('default'); $view = elgg_view_entity($this, true); elgg_set_viewtype(); $tmp[] = new ODDMetaData($uuid . "volatile/renderedentity/", $uuid, 'renderedentity', $view, 'volatile'); return $tmp; } /* * IMPORTABLE INTERFACE */ /** * Import data from an parsed ODD xml data array. * * @param array $data XML data * * @return true */ public function import(ODD $data) { if (!($data instanceof ODDEntity)) { throw new InvalidParameterException(elgg_echo('InvalidParameterException:UnexpectedODDClass')); } // Set type and subtype $this->attributes['type'] = $data->getAttribute('class'); $this->attributes['subtype'] = $data->getAttribute('subclass'); // Set owner $this->attributes['owner_guid'] = get_loggedin_userid(); // Import as belonging to importer. // Set time $this->attributes['time_created'] = strtotime($data->getAttribute('published')); $this->attributes['time_updated'] = time(); return true; } /* * SYSTEM LOG INTERFACE */ /** * Return an identification for the object for storage in the system log. * This id must be an integer. * * @return int */ public function getSystemLogID() { return $this->getGUID(); } /** * For a given ID, return the object associated with it. * This is used by the river functionality primarily. * * This is useful for checking access permissions etc on objects. * * @param int $id GUID. * * @todo How is this any different or more useful than get_entity($guid) * or new ElggEntity($guid)? * * @return int GUID */ public function getObjectFromID($id) { return get_entity($id); } /** * Returns tags for this entity. * * @warning Tags must be registered by {@link elgg_register_tag_metadata_name()}. * * @param array $tag_names Optionally restrict by tag metadata names. * * @return array */ public function getTags($tag_names = NULL) { global $CONFIG; if ($tag_names && !is_array($tag_names)) { $tag_names = array($tag_names); } $valid_tags = elgg_get_registered_tag_metadata_names(); $entity_tags = array(); foreach ($valid_tags as $tag_name) { if (is_array($tag_names) && !in_array($tag_name, $tag_names)) { continue; } if ($tags = $this->$tag_name) { // if a single tag, metadata returns a string. // if multiple tags, metadata returns an array. if (is_array($tags)) { $entity_tags = array_merge($entity_tags, $tags); } else { $entity_tags[] = $tags; } } } return $entity_tags; } }