PHPStan reports possibly undefined variable, but it's defined in included script

Question

I have an application where I define some variables in a file (a.php), then include this from another file (b.php). PHPStan is complaining about possibly undefined variables.

Simplified example:

a.php:

$config['foo'] = 'bar';

b.php:

<?php

require 'a.php';

//new SlimApp($config)->run();
echo $config;

PHPStan says:

------ ---------------------------------------- 
  Line   b.php                                   
 ------ ---------------------------------------- 
  :6     Variable $config might not be defined.  
 ------ ----------------------------------------

Also: I don't know why but if I remove the <?php line at the beginning of b.php, the warning goes away.

How can I have PHPStan realize that $config is actually defined?

Btw I am aware of this question. It is not the same problem as I am explicitly including the file where the variable is defined.

You cannot echo an Array! Could it just be that thats causing the message — RiggsFolly
– RiggsFolly, Commented Nov 17, 2022 at 10:48
Read the comment under/in your linked question that starts with "just a config/bootstrap file". Thats explains it good. And "might not" is not "not" defined. — Foobar
– Foobar, Commented Nov 17, 2022 at 10:50
@Foobar No, the linked question does not explicitly require or include anything, it just relies on the variables being defined elsewhere. PHPStan cannot know that. This case is different. — Grodriguez
– Grodriguez, Commented Nov 17, 2022 at 11:20
@Grodriguez Ok, then try something like /** @var array $config */ at the top of the file, see: github.com/phpstan/phpstan/issues/5815 — Foobar
– Foobar, Commented Nov 17, 2022 at 11:45

Grodriguez · Accepted Answer · 2022-11-17 18:27:52Z

2

One Solution:

Yo can prevent the notice with /** @var array $config */ at the top of the file.

See for more information here: https://github.com/phpstan/phpstan/issues/5815

edited Nov 17, 2022 at 18:27

Grodriguez

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answered Nov 17, 2022 at 12:53

Foobar

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