Weird error on unset of array #3391
Description
Bug report
I'm utilising the Symfony Normalizer in my project. I've only got PHPStan on level 2 but this error occurs when trying to unset a value returned in the serializer.
Cannot unset offset 'id' on array('bar' => 'b').
Code snippet that reproduces the problem
<?php declare(strict_types=1);
class HelloWorld
{
/**
* This method represents \Symfony\Component\Serializer\Normalizer\NormalizerInterface::normalize().
*
* @return array|string|int|float|bool|null
*/
public function getArray()
{
return ['id' => 1];
}
public function test()
{
$data = $this->getArray();
$data['foo'] = 'a';
$data['bar'] = 'b';
unset($data['id']);
return $data;
}
}Expected output
No errors.
Examples
This shows the error:
https://phpstan.org/r/d3f05294-9abc-4f48-ad77-c71d371b4cfd
However, when removing either of lines 8/20/21 the error goes away...
https://phpstan.org/r/fba7b0b0-735f-4ba5-8fc4-b33a94dcff04
or... https://phpstan.org/r/4b79df96-40b4-4720-b270-ac98455f80b3