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array_shift() regression with some arrays #7968

cs278 opened this issue Sep 8, 2022 · 2 comments · Fixed by phpstan/phpstan-src#1712

array_shift() regression with some arrays #7968

cs278 opened this issue Sep 8, 2022 · 2 comments · Fixed by phpstan/phpstan-src#1712


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cs278 commented Sep 8, 2022

Bug report

PHPStan 1.8.2 didn't raise an error on this code but starting from 1.8.3 an error is raised, the rules for array_shift()/array_pop() no longer seem to understand that the array can be empty.

Code snippet that reproduces the problem

<?php declare(strict_types = 1);

class HelloWorld
	 * @param array{name: string, age: int} $a
	 * @param array{name: string, age: int} $b
	public function compare(array $a, array $b): int
		$sort = [
			$a['name'] <=> $b['name'],
			$a['age'] <=> $b['age'],
		$sort = array_filter($sort, function (int $value): bool {
			return $value !== 0;
		return array_shift($sort) ?? 0; // Error: Expression on left side of ?? is not nullable.

Expected output

No error should be raised.

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herndlm commented Sep 8, 2022

I'm on it, this should be a similar thing as phpstan/phpstan-src#1696
also: I broke that, sorry 😅

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2 participants