PHP Interface Gliph\Graph\Digraph

Inheritance: extends Gliph\Graph\Graph

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Public Methods

Method	Description
arcsFrom ( $vertex ) : Generator	Enumerates each out-arc from the provided vertex via a generator.
arcsTo ( $vertex ) : Generator	Enumerates each in-arc from the provided vertex via a generator.
getCycles ( ) : array	Returns the cycles in this graph, if any.
inDegreeOf ( object $vertex ) : integer	Returns the in-degree (number of incoming edges) for the provided vertex.
isAcyclic ( ) : boolean	Indicates whether or not this graph is acyclic.
outDegreeOf ( object $vertex ) : integer	Returns the out-degree (count of outgoing edges) for the provided vertex.
predecessorsOf ( object $vertex ) : Generator	Enumerates each predecessor vertex to the provided vertex via a generator.
successorsOf ( object $vertex ) : Generator	Enumerates each successor vertex to the provided vertex via a generator.
transpose ( ) : Gliph\Graph\Digraph	Returns the transpose of this graph.

Method Details

arcsFrom() public method

An arc is outbound from a vertex if that vertex is the 'tail' of the arc. Returns a generator that yields 2-tuple (array) where the first two values represent the vertex pair. Vertex order is guaranteed: the first vertex is the tail, and the second vertex is the head. If the graph has additional edge data (e.g., weight), additional elements are appended to the edge array as needed. (See implementation-specific documentation for more detail).

arcsTo() public method

An arc is inbound to a vertex if that vertex is the 'head' of the arc. Returns a generator that yields 2-tuple (array) where the first two values represent the vertex pair. Vertex order is guaranteed: the first vertex is the tail, and the second vertex is the head. If the graph has additional edge data (e.g., weight), additional elements are appended to the edge array as needed. (See implementation-specific documentation for more detail).

getCycles() public method

Returns the cycles in this graph, if any.

public getCycles ( ) : array
return	array	An array of arrays, each subarray representing a full cycle in the graph. If the array is empty, the graph is acyclic.

inDegreeOf() public method

In undirected graphs, in-degree and out-degree are the same.

public inDegreeOf ( object $vertex ) : integer
$vertex	object	The vertex for which to retrieve in-degree information.
return	integer

isAcyclic() public method

Indicates whether or not this graph is acyclic.

public isAcyclic ( ) : boolean
return	boolean

outDegreeOf() public method

In undirected graphs, in-degree and out-degree are the same.

public outDegreeOf ( object $vertex ) : integer
$vertex	object	The vertex for which to retrieve out-degree information.
return	integer

predecessorsOf() public method

A vertex (B) is a predecessor to another vertex (A) if an arc points from B to A. In such an arc, B is considered the 'tail', A is considered the 'head', as it would be visually represented with an arrow: B -> A Note that, in set terms, g.adjacentTo(x) == g.successorsOf(x) ∪ g.predecessorsOf(x)

public predecessorsOf ( object $vertex ) : Generator
$vertex	object	The vertex whose predecessor vertices should be enumerated.
return	Generator	A generator that yields predecessor vertices as values.

successorsOf() public method

A vertex (B) is a successor to another vertex (A) if an arc points from A to B. In such an arc, A is considered the 'tail', B is considered the 'head', as it would be visually represented with an arrow: A -> B Note that, in set terms, g.adjacentTo(x) == g.successorsOf(x) ∪ g.predecessorsOf(x)

public successorsOf ( object $vertex ) : Generator
$vertex	object	The vertex whose successor vertices should be enumerated.
return	Generator	A generator that yields successor vertices as values.

transpose() public method

A transpose is identical to the current graph, except that its edges have had their directionality reversed. Transposed graphs are sometimes called the 'reverse' or 'converse'.

public transpose ( ) : Gliph\Graph\Digraph
return	Gliph\Graph\Digraph

public arcsFrom ( $vertex ) : Generator
$vertex		The vertex whose out-arcs should be visited.
return	Generator	A generator that yields out-arcs as values.

public arcsTo ( $vertex ) : Generator
$vertex		The vertex whose in-arcs should be visited.
return	Generator	A generator that yields in-arcs as values.