phpのポインタの変な挙動(再)

<?php

$a = [0,1,2];

$unko = &$a[1];

$result = $a;

foreach($a as &$v){
    $v += 100;
}

print_r($result);

<?php

$a = [0,1,2];

$unko = &$a[1];

$result = $a;

foreach($a as &$v){

$v += 100;

}

print_r($result);

Array
(
    [0] => 0
    [1] => 101
    [2] => 2
)

Array

(

[0] => 0

[1] => 101

[2] => 2

)