ArrayObject::exchangeArray

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

ArrayObject::exchangeArray — Exchange the array for another one

说明

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

Exchange the current array with another array or object.

参数

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

返回值

Returns the old array.

示例

示例 #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);

?>

以上示例会输出：

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

down

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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