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Date: Sat, 30 Jul 2022 16:01:09 +0200
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To: juan carlos morales <dev.juan.morales@gmail.com>
Cc: internals@lists.php.net
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Subject: Re: [PHP-DEV] RFC Idea - is_json - looking for feedback
From: nikita.ppv@gmail.com (Nikita Popov)

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On Fri, Jul 29, 2022 at 4:27 PM juan carlos morales <
dev.juan.morales@gmail.com> wrote:

> I am following the RFC guideline for the first time. (
> https://wiki.php.net/rfc/howto)
>
> As suggested there, I am here to get a feeling from you, regarding the
> following RFC for PHP.
>
> # Change (draft):
>
> New function in php called like:
>
> is_json(string $string): bool
>
> ## Description
> ### Parameters
> string $string -> string to find out if is a valid JSON or not
>
> ### Return
> Returns a bool. The function is capable to determine if the passed string
> is a valid JSON (true) or not (false).
>
> # Why this function ?
>
> At the moment the only way to determine if a JSON-string is valid we have
> to execute the json_decode() function.
>
> The drawback about this, is that json_decode() generates an in memory an
> object/array (depending on parameters) while parsing the string; this leads
> to a memory usage that is not needed (because we use memory for creating
> the object/array) and also can cause an error for reaching the memory-limit
> of the php process.
>
> Sometimes we just need to know is the string is a valid json or not, and
> nothing else.
>
> # Do we need something like this? If a check to an string is valid JSON
> then for sure I will have to use it in my code either as an object or an
> array.
>
> Well that is not true. There are plenty of cases where you just need to
> check if a string is a valid json and that is it. Just looking into
> stackoverflow will give you an idea about how many people is looking for
> something like this in an efficient way.
>

Could you please give some specific examples where the proposed
functionality would be useful?

Regards,
Nikita

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