Invalid array key type for 3-nested for loops #3044
Description
Bug report
When using 3 nested for loops on an array<int, array<int, float>> and assigning them to an array phpstan believes the first index can be int|string.
Method HelloWorld::invalidType() should return array<int, array<int, float>> but returns array<int|string, array<int, float>>. |
Code snippet that reproduces the problem
https://phpstan.org/r/899f83f5-5deb-4335-b8e7-54c4f3315abb
<?php declare(strict_types = 1);
class HelloWorld
{
/**
* @return array<int, array<int, float>>
*/
private function getIntArrayFloatArray() : array
{
return [
0 => [1.1, 2.2, 3.3],
1 => [1.1, 2.2, 3.3],
2 => [1.1, 2.2, 3.3],
];
}
/**
* @return array<int, array<int, float>>
*/
public function invalidType() : array
{
$X = $this->getIntArrayFloatArray();
$L = $this->getIntArrayFloatArray();
$n = 3;
$m = 3;
for ($k = 0; $k < $m; ++$k) {
for ($j = 0; $j < $n; ++$j) {
for ($i = 0; $i < $k; ++$i) {
$X[$k][$j] -= $X[$i][$j] * $L[$k][$i];
}
}
}
return $X;
}
}
Expected output
No error.