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Date: Tue, 13 Dec 2022 14:32:12 +0000
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To: Rowan Tommins <rowan.collins@gmail.com>
Subject: Re: [PHP-DEV] Revisiting RFC: Engine Warnings -- Undefined array
 index
From: craig@craigfrancis.co.uk (Craig Francis)

On 13 Dec 2022, at 12:39, Rowan Tommins <rowan.collins@gmail.com> wrote:
> On 13/12/2022 10:11, Craig Francis wrote:
>> The null value can come from many sources (e.g. =
GET/POST/COOKIE/databases)
>=20
>=20
> These two examples are interesting in conjunction: $_GET, $_POST, and =
$_COOKIE will never contain null values unless you have code writing =
directly to them, because HTTP has no representation for it, only empty =
strings.



Most frameworks return NULL when the user has not provided the value:

    $search =3D $request->input('q'); // Laravel
    $search =3D $request->get('q'); // Symfony
    $search =3D $this->request->getQuery('q'); // CakePHP
    $search =3D $request->getGet('q'); // CodeIgniter

This is also common, to avoid undefined indexes (as you suggested =
earlier):

    $search =3D ($_GET['q'] ?? NULL);

And some developers use:

    $search =3D filter_input(INPUT_GET, 'q');

That said, I'm glad you have found a positive example from this change.

Craig