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    ArrayObject::exchangeArray

    (PHP 5 >= 5.1.0, PHP 7, PHP 8)

    ArrayObject::exchangeArray — 配列を別の配列と交換する

    説明

    public ArrayObject::exchangeArray(array|object $array): array

    現在の配列を、別の配列あるいはオブジェクトと交換します。

    パラメータ

    array

    現在の配列と交換する配列あるいはオブジェクト。

    戻り値

    元の配列を返します。

    例

    例1 ArrayObject::exchangeArray() の例

    <?php
    // フルーツの配列
    $fruits = array("lemons" => 1, "oranges" => 4, "bananas" => 5, "apples" => 10);
    // ヨーロッパの都市の配列
    $locations = array('Amsterdam', 'Paris', 'London');

    $fruitsArrayObject = new ArrayObject($fruits);

    // フルーツを都市と交換します
    $old = $fruitsArrayObject->exchangeArray($locations);
    print_r($old);
    print_r($fruitsArrayObject);

    ?>

    上の例の出力は以下となります。

    Array
(
    [lemons] => 1
    [oranges] => 4
    [bananas] => 5
    [apples] => 10
)
ArrayObject Object
(
    [0] => Amsterdam
    [1] => Paris
    [2] => London
)

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    User Contributed Notes 3 notes

    up
    4
    Corentin Larose
    10 years ago
    It's worth notting that ArrayObject::exchangeArray() doesn't call ArrayObject::offsetSet() internally for each offset/property of the array/object provided in argument.

    It's also worth noting the let's say "unexpected" behavior of get/set:

    <?php
    class MyArrayObject extends ArrayObject
    {
        public function     offsetSet($name, $value)
        {
                parent::offsetSet($name . '_control', $value);
                parent::offsetSet($name, $value);
        }
    }

    $test = new MyArrayObject();
    $test->setFlags(\ArrayObject::ARRAY_AS_PROPS);
    $test['my_value_1'] = 1;
    $test['my_value_1'] = $test['my_value_1'] + 1;
    $test['my_value_1'] += 1;
    $test['my_value_1'] ++;
    ++     $test['my_value_1'];

    $test->my_value_2 = 1;
    $test->my_value_2 = $test->my_value_2 + 1;
    $test->my_value_2 += 1;
    $test->my_value_2 ++;
    ++     $test->my_value_2;

    print_r($test);

    // Prints out:
    MyArrayObject Object
    (
        [    storage:ArrayObject:private] => Array
            (
                [    my_value_1_control] => 3
                    [my_value_1] => 5
                    [my_value_2_control] => 2
                    [my_value_2] => 5
                )
    )
    ?>
    up
    6
    Dmitri Snytkine
    15 years ago
    It seems that input array is always passed by reference.
    For example if you have an existing array
    $array with some values
    then you have an arrayobject $o
    and then you do this:
    $o->exchangeArray($array);
    $o->offsetSet('somekey', 'some value');

    Now if you check your $array array, it will have
    a key 'somekey' with value of 'some value'

    I totally did not expect that, I am sure it was a mistake to pass array by reference by default.
    up
    0
    ievgen dot varava at spryker dot com
    3 years ago
    Looks like PHP8 brings undocumented change to this method signature. Example:

    <?php
    interface intA {
        public function     exchangeArray($param);
    }

    class     classB extends ArrayObject implements intA {}
    ?>

    PHP 7.4.13: no errors

    PHP 8.0.0: Fatal error:  Declaration of ArrayObject::exchangeArray(object|array $array) must be compatible with intA::exchangeArray($param)
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