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From: "J.O. Aho" <user@example.net>
Newsgroups: comp.lang.php
Subject: Re: JSON encode "corrupted"?
Date: Thu, 5 Aug 2021 21:49:48 +0200
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On 05/08/2021 21:25, Torakiki wrote:
> 
>  > Why? $array is still just an array with one scalar element.
> 
> Try this (last PHP 7.4.22 x64):
> 
> <?php
> 
> $array=[];
> $array[0]="Some text";
> var_dump($array);
> 
> $json=json_encode($array);
> var_dump($json);
> 
> 
> $array=[];
> $array[1]="Some text";
> var_dump($array);
> 
> $json=json_encode($array);
> var_dump($json);
> 
> ?>
> 
> IMHO, seem to be a bug!

nope, not a bug, just a standard how to represent different types of arrays.
https://cswr.github.io/JsonSchema/spec/arrays/