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Map
Creates a new map using a callable to determine which pairs to include

Ds\Map::filter

(PECL ds >= 1.0.0)

Ds\Map::filter — Creates a new map using a callable to determine which pairs to include

说明

public Ds\Map::filter ([ callable $callback ] ) : Ds\Map

Creates a new map using a callable to determine which pairs to include.

参数

callback

callback ( mixed $key , mixed $value ) : bool

Optional callable which returns TRUE if the pair should be included, FALSE otherwise.

If a callback is not provided, only values which are TRUE (see converting to boolean) will be included.

返回值

A new map containing all the pairs for which either the callback returned TRUE, or all values that convert to TRUE if a callback was not provided.

范例

Example #1 Ds\Map::filter() example using callback function

 <?php
$map = new \Ds\Map(["a", "b", "c", "d", "e"]);

var_dump($map->filter(function($key, $value) {
    return $key % 2 == 0;
}));
?>

以上例程的输出类似于：

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

Example #2 Ds\Map::filter() example without a callback function

 <?php
$map = new \Ds\Map(["a" => 0, "b" => 1, "c" => true, "d" => false]);

var_dump($map->filter());
?>

以上例程的输出类似于：

object(Ds\Map)#2 (3) {
  [0]=>
  int(1)
  [1]=>
  string(1) "a"
  [2]=>
  bool(true)
}