php foreach duplicate first item

Question

For object created from array foreach cycle go through first item twice

$list = (object)['a' => 1, 'b' => 2];
echo json_encode($list);

$pointers = [];
foreach($list as $n => $v)
    $pointers[] = &$list->$n;

var_dump($pointers);

json returns 2 items, pointers at end returns 3 items. What can be wrong?

But if I create object as stdClass, it works as expected.

$list = new stdClass();
$list->a = 1;
$list->b = 2;
echo json_encode($list);

$pointers = [];
foreach($list as $n => $v)
    $pointers[] = &$list->$n;

var_dump($pointers);

json returns 2 items, pointers at end returns 2 items

The pointer array is returning 2 items ideone.com/yWDVh3 . Check it out. — Ayush
– Ayush, Commented Mar 21, 2017 at 14:19
I don't know exactly but this might be related with pointer. If you change to $list->$n in your first example you correctly have 2 items. Maybe there is some additional pointer defined when casting to (object). Need to check that out. — Unex
– Unex, Commented Mar 21, 2017 at 14:20
@Ayush In php 7 i have this output {"a":1,"b":2}array(3) { [0]=> &int(1) [1]=> &int(1) [2]=> &int(2) } but it works fine in php 5.6 — Unex
– Unex, Commented Mar 21, 2017 at 14:22

CMR · Accepted Answer · 2017-03-21 14:37:55Z

3

It appears to be an oddity with PHP 7.0, as it works as expected in 7.1 and < 7.

You may have to do something like this instead:

$list = (object)['a' => 1, 'b' => 2];
echo json_encode($list);

$pointers = [];
$items = get_object_vars($list);

foreach($items as $key => $val){
    $pointers[] = &$list->$key;
}


var_dump($pointers);

answered Mar 21, 2017 at 14:37

CMR

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