Fix get_class in match expression

Author: ondrejmirtes

src/Analyser/TypeSpecifier.php

@@ -334,15 +334,7 @@ public function specifyTypesInCondition(
 					&& isset($exprNode->getArgs()[0])
 					&& $constantType instanceof ConstantStringType
 				) {
-					return $this->specifyTypesInCondition(
-						$scope,
-						new Instanceof_(
-							$exprNode->getArgs()[0]->value,
-							new Name($constantType->getValue()),
-						),
-						$context,
-						$rootExpr,
-					);
+					return $this->specifyTypesInCondition($scope, new Expr\BinaryOp\Identical($expr->left, $expr->right), $context, $rootExpr);
 				}
 			}
 
@@ -1118,6 +1110,24 @@ private function specifyTypesForConstantStringBinaryExpression(
 			}
 		}
 
+		if (
+			$context->true()
+			&& $unwrappedExprNode instanceof FuncCall
+			&& $unwrappedExprNode->name instanceof Name
+			&& strtolower($unwrappedExprNode->name->toString()) === 'get_class'
+			&& isset($unwrappedExprNode->getArgs()[0])
+		) {
+			return $this->specifyTypesInCondition(
+				$scope,
+				new Instanceof_(
+					$unwrappedExprNode->getArgs()[0]->value,
+					new Name($constantType->getValue()),
+				),
+				$context,
+				$rootExpr,
+			)->unionWith($this->create($exprNode, $constantType, $context, false, $scope, $rootExpr));
+		}
+
 		if (
 			$context->true()
 			&& $exprNode instanceof FuncCall

tests/PHPStan/Analyser/TypeSpecifierTest.php

@@ -193,8 +193,8 @@ public function dataCondition(): array
 					]),
 					new String_('Foo'),
 				),
-				['$foo' => 'Foo'],
-				['$foo' => '~Foo'],
+				['$foo' => 'Foo', 'get_class($foo)' => '\'Foo\''],
+				['get_class($foo)' => '~\'Foo\''],
 			],
 			[
 				new Equal(
@@ -203,8 +203,8 @@ public function dataCondition(): array
 						new Arg(new Variable('foo')),
 					]),
 				),
-				['$foo' => 'Foo'],
-				['$foo' => '~Foo'],
+				['$foo' => 'Foo', 'get_class($foo)' => '\'Foo\''],
+				['get_class($foo)' => '~\'Foo\''],
 			],
 			[
 				new BooleanNot(

tests/PHPStan/Analyser/data/match-expr.php

@@ -2,6 +2,7 @@
 
 namespace MatchExpr;
 
+use function get_class;
 use function PHPStan\Testing\assertType;
 
 class Foo
@@ -77,3 +78,26 @@ public function doGettype(int|float|bool|string|object|array $value): void
 	}
 
 }
+
+final class FinalFoo
+{
+
+}
+
+final class FinalBar
+{
+
+}
+
+class TestGetClass
+{
+
+	public function doMatch(FinalFoo|FinalBar $class): void
+	{
+		match (get_class($class)) {
+			FinalFoo::class => assertType(FinalFoo::class, $class),
+			FinalBar::class => assertType(FinalBar::class, $class),
+		};
+	}
+
+}

tests/PHPStan/Rules/Comparison/data/match-expr.php

@@ -180,3 +180,26 @@ function (): string {
 		-1 => 'down',
 	};
 };
+
+final class FinalFoo
+{
+
+}
+
+final class FinalBar
+{
+
+}
+
+class TestGetClass
+{
+
+	public function doMatch(FinalFoo|FinalBar $class): void
+	{
+		match (get_class($class)) {
+			FinalFoo::class => 1,
+			FinalBar::class => 2,
+		};
+	}
+
+}