Ds\Map::intersect

(PECL ds >= 1.0.0)

Ds\Map::intersectCreates a new map by intersecting keys with another map

Descrizione

public Ds\Map::intersect(Ds\Map $map): Ds\Map

Creates a new map containing the pairs of the current instance whose keys are also present in the given map. In other words, returns a copy of the current instance with all keys removed that are not also in the other map.

A ∩ B = {x : x ∈ A ∧ x ∈ B}

Nota:

Values from the current instance will be kept.

Elenco dei parametri

map

The other map, containing the keys to intersect with.

Valori restituiti

The key intersection of the current instance and another map.

See Also

Esempi

Example #1 Ds\Map::intersect() example

<?php
$a 
= new \Ds\Map(["a" => 1"b" => 2"c" => 3]);
$b = new \Ds\Map(["b" => 4"c" => 5"d" => 6]);

var_dump($a->intersect($b));
?>

Il precedente esempio visualizzerà qualcosa simile a:

object(Ds\Map)#3 (2) {
  [0]=>
  object(Ds\Pair)#4 (2) {
    ["key"]=>
    string(1) "b"
    ["value"]=>
    int(2)
  }
  [1]=>
  object(Ds\Pair)#5 (2) {
    ["key"]=>
    string(1) "c"
    ["value"]=>
    int(3)
  }
}
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