Namespaces
	Elgg\Core
	Activate a plugin or plugins.

Functions
	row_to_elggrelationship ($row)
	Convert a database row to a new ElggRelationship. More...

	get_relationship ($id)
	Get a relationship by its ID. More...

	_elgg_get_relationship_row ($id)
	Get a database row from the relationship table. More...

	delete_relationship ($id)
	Delete a relationship by its ID. More...

	add_entity_relationship ($guid_one, $relationship, $guid_two)
	Create a relationship between two entities. More...

	check_entity_relationship ($guid_one, $relationship, $guid_two)
	Check if a relationship exists between two entities. More...

	remove_entity_relationship ($guid_one, $relationship, $guid_two)
	Delete a relationship between two entities. More...

	remove_entity_relationships ($guid, $relationship="", $inverse_relationship=false, $type= '')
	Removes all relationships originating from a particular entity. More...

	get_entity_relationships ($guid, $inverse_relationship=false)
	Get all the relationships for a given GUID. More...

	elgg_get_entities_from_relationship ($options)
	Return entities matching a given query joining against a relationship. More...

	elgg_get_entity_relationship_where_sql ($column, $relationship=null, $relationship_guid=null, $inverse_relationship=false)
	Returns SQL appropriate for relationship joins and wheres. More...

	elgg_list_entities_from_relationship (array $options=array())
	Returns a viewable list of entities by relationship. More...

	elgg_get_entities_from_relationship_count (array $options=array())
	Gets the number of entities by a the number of entities related to them in a particular way. More...

	elgg_list_entities_from_relationship_count ($options)
	Returns a list of entities by relationship count. More...

Function Documentation

_elgg_get_relationship_row ( $id )

Get a database row from the relationship table.

Parameters

int $id The relationship ID

Returns: stdClass|false False if no row found private

Definition at line 49 of file relationships.php.

add_entity_relationship	(	$guid_one,
		$relationship,
		$guid_two
	)

Create a relationship between two entities.

E.g. friendship, group membership, site membership.

This function lets you make the statement "$guid_one is a $relationship of $guid_two". In the statement, $guid_one is the subject of the relationship, $guid_two is the target, and $relationship is the type.

Parameters

int	$guid_one	GUID of the subject entity of the relationship
string	$relationship	Type of the relationship
int	$guid_two	GUID of the target entity of the relationship

Returns: bool

Exceptions

InvalidArgumentException

Definition at line 91 of file relationships.php.

check_entity_relationship	(	$guid_one,
		$relationship,
		$guid_two
	)

Check if a relationship exists between two entities.

If so, the relationship object is returned.

This function lets you ask "Is $guid_one a $relationship of $guid_two?"

Parameters

int	$guid_one	GUID of the subject entity of the relationship
string	$relationship	Type of the relationship
int	$guid_two	GUID of the target entity of the relationship

Returns: ElggRelationship|false Depending on success

Definition at line 141 of file relationships.php.

delete_relationship ( $id )

Delete a relationship by its ID.

Parameters

int $id The relationship ID

Returns: bool

Definition at line 64 of file relationships.php.

elgg_get_entities_from_relationship ( $options )

Return entities matching a given query joining against a relationship.

Also accepts all options available to elgg_get_entities() and elgg_get_entities_from_metadata().

To ask for entities that do not have a particular relationship to an entity, use a custom where clause like the following:

$options['wheres'][] = "NOT EXISTS (
    SELECT 1 FROM {$db_prefix}entity_relationships
        WHERE guid_one = e.guid
        AND relationship = '$relationship'
)";

See also: elgg_get_entities; elgg_get_entities_from_metadata

Parameters

array $options Array in format:

relationship => null|STR Type of the relationship

relationship_guid => null|INT GUID of the subject or target entity

inverse_relationship => false|BOOL Is relationship_guid is the target entity of the relationship? By default, relationship_guid is the subject.

relationship_join_on => null|STR How the entities relate: guid (default), container_guid, or owner_guid Add in Elgg 1.9.0. Examples using the relationship 'friend':

use 'guid' if you want the user's friends
use 'owner_guid' if you want the entities the user's friends own (including in groups)
use 'container_guid' if you want the entities in the user's personal space (non-group)

Returns: ElggEntity[]|mixed If count, int. If not count, array. false on errors.

Since: 1.7.0

Definition at line 304 of file relationships.php.

elgg_get_entities_from_relationship_count ( array $options = array() )

Gets the number of entities by a the number of entities related to them in a particular way.

This is a good way to get out the users with the most friends, or the groups with the most members.

Parameters

array $options An options array compatible with elgg_get_entities_from_relationship()

Returns: ElggEntity[]|int|boolean If count, int. If not count, array. false on errors.

Since: 1.8.0

Definition at line 437 of file relationships.php.

elgg_get_entity_relationship_where_sql	(	$column,
		$relationship = `null`,
		$relationship_guid = `null`,
		$inverse_relationship = `false`
	)

Returns SQL appropriate for relationship joins and wheres.

Parameters

string	$column	Column name the GUID should be checked against. Provide in table.column format.
string	$relationship	Type of the relationship
int	$relationship_guid	Entity GUID to check
bool	$inverse_relationship	Is $relationship_guid the target of the relationship?

Returns: mixed

Since: 1.7.0 private

Definition at line 370 of file relationships.php.

elgg_list_entities_from_relationship ( array $options = array() )

Returns a viewable list of entities by relationship.

Parameters

array $options Options array for retrieval of entities

See also: elgg_list_entities(); elgg_get_entities_from_relationship()

Returns: string The viewable list of entities

Definition at line 423 of file relationships.php.

elgg_list_entities_from_relationship_count ( $options )

Returns a list of entities by relationship count.

See also: elgg_get_entities_from_relationship_count()

Parameters

array $options Options array

Returns: string

Since: 1.8.0

Definition at line 454 of file relationships.php.

get_entity_relationships	(	$guid,
		$inverse_relationship = `false`
	)

Get all the relationships for a given GUID.

Parameters

int	$guid	GUID of the subject or target entity (see $inverse)
bool	$inverse_relationship	Is $guid the target of the deleted relationships? By default $guid is the subject of the relationships.

Returns: ElggRelationship[]

Definition at line 257 of file relationships.php.

get_relationship ( $id )

Get a relationship by its ID.

Parameters

int $id The relationship ID

Returns: ElggRelationship|false False if not found

Definition at line 32 of file relationships.php.

remove_entity_relationship	(	$guid_one,
		$relationship,
		$guid_two
	)

Delete a relationship between two entities.

This function lets you say "$guid_one is no longer a $relationship of $guid_two."

Parameters

int	$guid_one	GUID of the subject entity of the relationship
string	$relationship	Type of the relationship
int	$guid_two	GUID of the target entity of the relationship

Returns: bool

Definition at line 172 of file relationships.php.

remove_entity_relationships	(	$guid,
		$relationship = `""`,
		$inverse_relationship = `false`,
		$type = `''`
	)

Removes all relationships originating from a particular entity.

Parameters

int	$guid	GUID of the subject or target entity (see $inverse)
string	$relationship	Type of the relationship (optional, default is all relationships)
bool	$inverse_relationship	Is $guid the target of the deleted relationships? By default, $guid is the subject of the relationships.
string	$type	The type of entity related to $guid (defaults to all)

Returns: true

Definition at line 211 of file relationships.php.

row_to_elggrelationship ( $row )

Convert a database row to a new ElggRelationship.

Parameters

stdClass $row Database row from the relationship table

Returns: ElggRelationship|false private

Definition at line 17 of file relationships.php.

Namespaces

Functions

Function Documentation