phpstan-src/tests/PHPStan/Rules/Variables/data/bug-14124.php at 502a4b6cdf6f5137802a883e937fc85bff17c32b · staabm/phpstan-src · GitHub

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<?php

namespace Bug14124;

use function PHPStan\Testing\assertType;

/**
 * @param array<string, list<string>> $convert
 * @param-out array<string, list<string>> $convert
 */
function example3a(array &$convert): void
{
	foreach ($convert as &$inner) {
		foreach ($inner as &$val) {
			$val = strtoupper($val);
		}
	}
	assertType('array<string, list<string>>', $convert);
}

/**
 * @param array<string, list<string>> $convert
 * @param-out array<string, list<string>> $convert
 */
function example3b(array &$convert): void
{
	foreach ($convert as $outerKey => $inner) {
		foreach ($inner as $key => $val) {
			$convert[$outerKey][$key] = strtoupper($val);
		}
	}
	assertType('array<string, list<string>>', $convert);
}