[edit] Last updated: Fri, 23 Mar 2012

ArrayObject::exchangeArray

(PHP 5 >= 5.1.0)

ArrayObject::exchangeArray — Exchange the array for another one.

Opis

public array ArrayObject::exchangeArray ( mixed $input )

Exchange the current array with another array or object.

Parametry

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

Zwracane wartości

Returns the old array.

Przykłady

Przykład #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);

?>

Powyższy przykład wyświetli:

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

add a note User Contributed Notes ArrayObject::exchangeArray

Dmitri Snytkine 15-Dec-2009 07:11


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.

add a note