ArrayObject exchangeArray() function in PHP

The exchangeArray() function of the ArrayObject class in PHP is used to exchange an array from an ArrayObject. That is, it replaces existing array from an ArrayObject with a newly described array.

Syntax:

ArrayObject exchangeArray( $inputArray )  

Parameters: This function accepts a single parameter $inputArray which is the new array with which the old array will be exchanged in the ArrayObject.

Return Value: This function returns the old array.

Below programs illustrate the above function:

Program 1:

<?php
// PHP program to illustrate the
// exchangeArray() function

$arr = array("a" => "geeks", "b" => "are", "c" => "awesome");

// Create array object
$arrObject = new ArrayObject($arr);

// New Array
$newArr = array("1" => "New", "2" => "Array");

// Exchange arrays in ArrayObject
$arrObject->exchangeArray($newArr);

print_r($arrObject);

?>

Output:

ArrayObject Object
(
    [storage:ArrayObject:private] => Array
        (
            [1] => New
            [2] => Array
        )

)

Program 2:

<?php
// PHP program to illustrate the
// exchangeArray() function

$arr = array("a" => "Welcome", "b" => "2", "c" => "GFG");

// Create array object
$arrObject = new ArrayObject($arr);

// New Array
$newArr = array("1" => "Hello", "2" => "World");

// Exchange arrays in ArrayObject
$arrObject->exchangeArray($newArr);

print_r($arrObject);

?>

Output:

ArrayObject Object
(
    [storage:ArrayObject:private] => Array
        (
            [1] => Hello
            [2] => World
        )

)

Reference: http://php.net/manual/en/arrayobject.exchangearray.php