Re: I have two identical keys in an array.

On 04.03.2022 at 16:34, Romain Moyne wrote:

> working with php 8.0.16, i am meeting a hard bug I can't really explain.
> One of my script populates an array and doing a var_dump I have that :
>
> Notice the duplicate -1 key. It should not exist as php should erase the
> previous key.
>
> array(3) {
>   [-1]=>
>   array(1) {
>     [0]=>
>     int(10585779)
>   }
>   [18]=>
>   array(2) {
>     [0]=>
>     int(10585779)
>     [1]=>
>     int(10586274)
>   }
>   [-1]=>
>   array(1) {
>     [0]=>
>     int(10586274)
>   }
> }
>
>
> And when doing a json_encode of that, I get that :
> "id_hash":{"-1":[10585779],"18":[10585779,10586274],"-1":[10586274]}
>
>
> I suspected a utf8 misencoding, but it seems it's not.
>
> Any thoughts?

To my knowledge, this is not supposed to happen, although the Zend
engine exposes at least one API (zend_hash_index_add_new()) which allows
to construct such arrays.  There might be a bug lurking around, possibly
in some extension.  Do you have a way to reproduce building this array?

--
Christoph M. Becker