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php 7.4: null["key"]

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I'm upgrading code to PHP 7.4, which will now blow a notice for things
such as

  null["key"]
  (1.2)["key"]
  (123)["key"]

All of these seem to reduce to null.  (The footnote explains why I think
so.)

I have a lot of code which could be depending on such things.  I'd like
to rewrite such code, but I have no idea how to find such code.  I
suppose a loop such as

  while ($a["key"]) { ... }

could be depending on $a sometimes being null or even being undefined
(because ``$a === null'' when $a is undefined).  (These are very weird
things about PHP to my way of looking at things.)

How would you search for something like that?  I just have no idea.  My
best idea is to just watch a log of errors and notices and try to spot
the code that way.

(*) Footnote

I say this because of 

--8<---------------cut here---------------start------------->8---
php > var_dump((123)["key"] === null);
PHP Notice: Trying to access array offset on value of type int in php
shell code on line 1

Notice: Trying to access array offset on value of type int in php shell
code on line 1
bool(true)
php >
--8<---------------cut here---------------end--------------->8---

(By the way, I don't know why I get two notices.)

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php 7.4: null["key"] Meredith Montgomery <mmontgomery@levado.to> - 2022-05-20 17:34 -0300
  Re: php 7.4: null["key"] Meredith Montgomery <mmontgomery@levado.to> - 2022-05-29 23:13 -0300
    Re: php 7.4: null["key"] "J.O. Aho" <user@example.net> - 2022-05-30 08:06 +0200
      Re: php 7.4: null["key"] Meredith Montgomery <mmontgomery@levado.to> - 2022-05-31 19:27 -0300
        Re: php 7.4: null["key"] De ongekruisigde <ongekruisigde@news.eternal-september.org> - 2022-05-31 22:39 +0000
          Re: php 7.4: null["key"] Meredith Montgomery <mmontgomery@levado.to> - 2022-06-02 17:26 -0300
            Re: php 7.4: null["key"] Meredith Montgomery <mmontgomery@levado.to> - 2022-06-03 17:09 -0300
              Re: php 7.4: null["key"] De ongekruisigde <ongekruisigde@news.eternal-september.org> - 2022-06-04 14:35 +0000

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