Constant arrays should be preserved after sorting, just not as certain lists

Author: ondrejmirtes

src/Analyser/NodeScopeResolver.php

@@ -3207,6 +3207,22 @@ private function getArraySortDoNotPreserveListFunctionType(Type $type): Type
 				return $traverse($type);
 			}
 
+			$constantArrays = $type->getConstantArrays();
+			if (count($constantArrays) > 0) {
+				$types = [];
+				foreach ($constantArrays as $constantArray) {
+					$types[] = new ConstantArrayType(
+						$constantArray->getKeyTypes(),
+						$constantArray->getValueTypes(),
+						$constantArray->getNextAutoIndexes(),
+						$constantArray->getOptionalKeys(),
+						TrinaryLogic::createMaybe(),
+					);
+				}
+
+				return TypeCombinator::union(...$types);
+			}
+
 			$newArrayType = new ArrayType($type->getIterableKeyType(), $type->getIterableValueType());
 			if ($isIterableAtLeastOnce->yes()) {
 				$newArrayType = TypeCombinator::intersect($newArrayType, new NonEmptyArrayType());

tests/PHPStan/Analyser/NodeScopeResolverTest.php

@@ -654,7 +654,10 @@ public function dataFileAsserts(): iterable
 		}
 
 		yield from $this->gatherAssertTypes(__DIR__ . '/data/never.php');
-		yield from $this->gatherAssertTypes(__DIR__ . '/data/bug-10627.php');
+
+		if (PHP_VERSION_ID >= 80100) {
+			yield from $this->gatherAssertTypes(__DIR__ . '/data/bug-10627.php');
+		}
 
 		yield from $this->gatherAssertTypes(__DIR__ . '/data/native-intersection.php');
 

tests/PHPStan/Analyser/data/bug-10627.php

@@ -2,6 +2,7 @@
 
 namespace Bug10627;
 
+use function array_is_list;
 use function PHPStan\Testing\assertType;
 
 class HelloWorld
@@ -10,35 +11,40 @@ public function sayHello(): void
 	{
 		$list = ['A', 'C', 'B'];
 		natcasesort($list);
-		assertType("non-empty-array<0|1|2, 'A'|'B'|'C'>", $list);
+		assertType("array{'A', 'C', 'B'}", $list);
+		assertType('bool', array_is_list($list));
 	}
 
 	public function sayHello2(): void
 	{
 		$list = ['A', 'C', 'B'];
 		natsort($list);
-		assertType("non-empty-array<0|1|2, 'A'|'B'|'C'>", $list);
+		assertType("array{'A', 'C', 'B'}", $list);
+		assertType('bool', array_is_list($list));
 	}
 
 	public function sayHello3(): void
 	{
 		$list = ['A', 'C', 'B'];
 		arsort($list);
-		assertType("non-empty-array<0|1|2, 'A'|'B'|'C'>", $list);
+		assertType("array{'A', 'C', 'B'}", $list);
+		assertType('bool', array_is_list($list));
 	}
 
 	public function sayHello4(): void
 	{
 		$list = ['A', 'C', 'B'];
 		asort($list);
-		assertType("non-empty-array<0|1|2, 'A'|'B'|'C'>", $list);
+		assertType("array{'A', 'C', 'B'}", $list);
+		assertType('bool', array_is_list($list));
 	}
 
 	public function sayHello5(): void
 	{
 		$list = ['A', 'C', 'B'];
 		ksort($list);
-		assertType("non-empty-array<0|1|2, 'A'|'B'|'C'>", $list);
+		assertType("array{'A', 'C', 'B'}", $list);
+		assertType('bool', array_is_list($list));
 	}
 
 	public function sayHello6(): void
@@ -47,7 +53,8 @@ public function sayHello6(): void
 		uasort($list, function () {
 
 		});
-		assertType("non-empty-array<0|1|2, 'A'|'B'|'C'>", $list);
+		assertType("array{'A', 'C', 'B'}", $list);
+		assertType('bool', array_is_list($list));
 	}
 
 	public function sayHello7(): void
@@ -56,14 +63,16 @@ public function sayHello7(): void
 		uksort($list, function () {
 
 		});
-		assertType("non-empty-array<0|1|2, 'A'|'B'|'C'>", $list);
+		assertType("array{'A', 'C', 'B'}", $list);
+		assertType('bool', array_is_list($list));
 	}
 
 	public function sayHello8(): void
 	{
 		$list = ['A', 'C', 'B'];
 		krsort($list);
-		assertType("non-empty-array<0|1|2, 'A'|'B'|'C'>", $list);
+		assertType("array{'A', 'C', 'B'}", $list);
+		assertType('bool', array_is_list($list));
 	}
 
 	/**
@@ -75,4 +84,12 @@ public function sayHello9(array $list): void
 		krsort($list);
 		assertType("array<int<0, max>, string>", $list);
 	}
+
+	public function sayHello10(): void
+	{
+		$list = ['a' => 'A', 'c' => 'C', 'b' => 'B'];
+		krsort($list);
+		assertType("array{a: 'A', c: 'C', b: 'B'}", $list);
+		assertType('false', array_is_list($list));
+	}
 }

tests/PHPStan/Analyser/data/param-out.php

@@ -221,7 +221,7 @@ function foo15() {
 		$manifest,
 		"fooCompare"
 	);
-	assertType('non-empty-array<0|1|2, 1|2|3>', $manifest);
+	assertType('array{1, 2, 3}', $manifest);
 }
 
 function fooSpaceship (string $a, string $b): int {
@@ -234,7 +234,7 @@ function foo16() {
 		$array,
 		"fooSpaceship"
 	);
-	assertType('non-empty-array<0|1, 1|2>', $array);
+	assertType('array{1, 2}', $array);
 }
 
 function fooShuffle() {
@@ -251,6 +251,7 @@ function fooSort() {
 	$array = ["foo" => 123, "bar" => 456];
 	sort($array);
 	assertType('non-empty-list<123|456>', $array);
+	assertType('true', array_is_list($array));
 
 	$emptyArray = [];
 	sort($emptyArray);