ArrayObject::exchangeArray()

(PHP 5 >= 5.1.0, PHP 7)

Exchange the array for another one

说明

Exchange the current array with another array or object.

参数

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

返回值

Returns the old array.

范例

ArrayObject::exchangeArray()example

以上例程会输出：

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

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.

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: