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    Ds\Vector::filter

    (PECL ds >= 1.0.0)

    Ds\Vector::filter — Creates a new vector using a callable to determine which values to include

    説明

    public Ds\Vector::filter(callable $callback = ?): Ds\Vector

    Creates a new vector using a callable to determine which values to include.

    パラメータ

    callback

    callback(mixed $value): bool

    Optional callable which returns true if the value should be included, false otherwise.

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

    戻り値

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

    例

    例1 Ds\Vector::filter() example using callback function

    <?php
    $vector     = new \Ds\Vector([1, 2, 3, 4, 5]);

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

    上の例の出力は、 たとえば以下のようになります。

    object(Ds\Vector)#3 (2) {
  [0]=>
  int(2)
  [1]=>
  int(4)
}

    例2 Ds\Vector::filter() example without a callback function

    <?php
    $vector     = new \Ds\Vector([0, 1, 'a', true, false]);

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

    上の例の出力は、 たとえば以下のようになります。

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

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