ArrayObject::exchangeArray

(PHP 5 >= 5.1.0)

ArrayObject::exchangeArrayExchange the array for another one.

Description

public array ArrayObject::exchangeArray ( mixed $input )

Exchange the current array with another array or object.

Parameters

input

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
)

Коментарии

Автор:
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.
2009-12-15 16:11:24
http://php5.kiev.ua/manual/ru/arrayobject.exchangearray.html
Автор:
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
       
)
)
?>
2014-05-09 17:59:13
http://php5.kiev.ua/manual/ru/arrayobject.exchangearray.html
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)
2021-03-03 01:02:12
http://php5.kiev.ua/manual/ru/arrayobject.exchangearray.html

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