Ds\Map::get

(PECL ds >= 1.0.0)

Ds\Map::get — Returns the value for a given key

説明

public function Ds\Map::get(mixed $key, mixed $default = ?): mixed

Returns the value for a given key, or an optional default value if the key could not be found.

注意:
Keys of type object are supported. If an object implements Ds\Hashable, equality will be determined by the object's equals function. If an object does not implement Ds\Hashable, objects must be references to the same instance to be considered equal.

注意:
You can also use array syntax to access values by key, eg. $map["key"].

警告

Be careful when using array syntax. Scalar keys will be coerced to integers by the engine. For example, $map["1"] will attempt to access int(1), while $map->get("1") will correctly look up the string key.

See Arrays.

パラメータ

key: The key to look up.
default: The optional default value, returned if the key could not be found.

戻り値

The value mapped to the given key, or the default value if provided and the key could not be found in the map.

エラー / 例外

OutOfBoundsException if the key could not be found and a default value was not provided.

例

例1 Ds\Map::get() example

<?php
$map = new \Ds\Map(["a" => 1, "b" => 2, "c" => 3]);

var_dump($map->get("a"));       // 1
var_dump($map->get("d", 10));   // 10 (default used)
?>

上の例の出力は、たとえば以下のようになります。

int(1)
int(10)

例2 Ds\Map::get() example using array syntax

<?php
$map = new \Ds\Map(["a" => 1, "b" => 2, "c" => 3]);

var_dump($map["a"]); // 1
?>

上の例の出力は、たとえば以下のようになります。

int(1)

関連キーワード:

default given found mixed syntax example dump optional Hashable access using look provided first hasKey Keys type supported implements equality determined equals implement objects references