Ds\Map::intersect

(PECL ds >= 1.0.0)

Ds\Map::intersect — Creates a new map by intersecting keys with another map

Açıklama

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}

Bilginize:

Values from the current instance will be kept.

Değiştirgeler

map

The other map, containing the keys to intersect with.

Dönen Değerler

The key intersection of the current instance and another map.

See Also

Örnekler

Örnek 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));
?>

Yukarıdaki örnek şuna benzer bir çıktı üretir:

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)
  }
}