PHP 8.4.0 RC4 available for testing

    ArrayObject::exchangeArray

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

    ArrayObject::exchangeArray — Exchange the array for another one

    Description

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

    Exchange the current array with another array or object.

    Parameters

    array

    The new array or object to exchange with the current array.

    Return Values

    Returns the old array.

    Examples

    Example #1 ArrayObject::exchangeArray() example

    <?php
    // Array of available fruits
    $fruits = array("lemons" => 1, "oranges" => 4, "bananas" => 5, "apples" => 10);
    // Array of locations in Europe
    $locations = array('Amsterdam', 'Paris', 'London');

    $fruitsArrayObject = new ArrayObject($fruits);

    // Now exchange fruits for locations
    $old = $fruitsArrayObject->exchangeArray($locations);
    print_r($old);
    print_r($fruitsArrayObject);

    ?>

    The above example will output:

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

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    User Contributed Notes 1 note

    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
    )
    )
    ?>
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