From d7fe7893597489aad37525063ad75dc0a83c497a Mon Sep 17 00:00:00 2001
From: phpstan-bot <79867460+phpstan-bot@users.noreply.github.com>
Date: Fri, 27 Feb 2026 13:40:41 +0000
Subject: [PATCH 1/2] Fix false positive class.nameCase when use alias matches
 another class

- In getOriginalClassNamePairsFromTypeNode(), detect when original name
  parts are a use alias (not just a case variant) by comparing them
  case-insensitively with the resolved name's suffix parts
- When parts differ (not just in case), skip creating a pair since the
  alias name is unrelated to the actual class name
- New regression test in tests/PHPStan/Rules/Methods/data/bug-14205.php

Closes https://github.com/phpstan/phpstan/issues/14205
---
 src/Rules/FunctionDefinitionCheck.php             |  7 +++++++
 .../ExistingClassesInTypehintsRuleTest.php        |  5 +++++
 tests/PHPStan/Rules/Methods/data/bug-14205.php    | 15 +++++++++++++++
 3 files changed, 27 insertions(+)
 create mode 100644 tests/PHPStan/Rules/Methods/data/bug-14205.php

diff --git a/src/Rules/FunctionDefinitionCheck.php b/src/Rules/FunctionDefinitionCheck.php
index c888ed886f..ca78471312 100644
--- a/src/Rules/FunctionDefinitionCheck.php
+++ b/src/Rules/FunctionDefinitionCheck.php
@@ -860,6 +860,13 @@ private function getOriginalClassNamePairsFromTypeNode(Identifier|Name|ComplexTy
 			$resolvedPartsCount = count($resolvedParts);
 
 			if ($originalPartsCount <= $resolvedPartsCount) {
+				$suffixParts = array_slice($resolvedParts, $resolvedPartsCount - $originalPartsCount);
+				for ($i = 0; $i < $originalPartsCount; $i++) {
+					if (strtolower($originalParts[$i]) !== strtolower($suffixParts[$i])) {
+						return []; // use alias, not just a case difference
+					}
+				}
+
 				$prefixParts = array_slice($resolvedParts, 0, $resolvedPartsCount - $originalPartsCount);
 				$originalCaseClassName = implode('\\', array_merge($prefixParts, $originalParts));
 			} else {
diff --git a/tests/PHPStan/Rules/Methods/ExistingClassesInTypehintsRuleTest.php b/tests/PHPStan/Rules/Methods/ExistingClassesInTypehintsRuleTest.php
index 929b3bdfd4..dd9f891c4a 100644
--- a/tests/PHPStan/Rules/Methods/ExistingClassesInTypehintsRuleTest.php
+++ b/tests/PHPStan/Rules/Methods/ExistingClassesInTypehintsRuleTest.php
@@ -657,4 +657,9 @@ public function testBug11470(): void
 		]);
 	}
 
+	public function testBug14205(): void
+	{
+		$this->analyse([__DIR__ . '/data/bug-14205.php'], []);
+	}
+
 }
diff --git a/tests/PHPStan/Rules/Methods/data/bug-14205.php b/tests/PHPStan/Rules/Methods/data/bug-14205.php
new file mode 100644
index 0000000000..35ab5741a0
--- /dev/null
+++ b/tests/PHPStan/Rules/Methods/data/bug-14205.php
@@ -0,0 +1,15 @@
+<?php declare(strict_types = 1);
+
+namespace Bug14205\Competitie\Team;
+
+class TeamsamenstellingService {}
+
+class SamenstellingService {}
+
+namespace Bug14205\Service;
+
+use Bug14205\Competitie\Team\SamenstellingService as TeamSamenstellingService;
+
+abstract class Foo {
+	abstract public function test(): TeamSamenstellingService;
+}

From 3830fe02266f5ad77d833cccbf7a7665fe11666f Mon Sep 17 00:00:00 2001
From: Vincent Langlet <vincentlanglet@hotmail.fr>
Date: Wed, 4 Mar 2026 20:20:23 +0100
Subject: [PATCH 2/2] Rework

---
 src/Rules/FunctionDefinitionCheck.php | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/src/Rules/FunctionDefinitionCheck.php b/src/Rules/FunctionDefinitionCheck.php
index ca78471312..6ef8f74b15 100644
--- a/src/Rules/FunctionDefinitionCheck.php
+++ b/src/Rules/FunctionDefinitionCheck.php
@@ -860,19 +860,17 @@ private function getOriginalClassNamePairsFromTypeNode(Identifier|Name|ComplexTy
 			$resolvedPartsCount = count($resolvedParts);
 
 			if ($originalPartsCount <= $resolvedPartsCount) {
-				$suffixParts = array_slice($resolvedParts, $resolvedPartsCount - $originalPartsCount);
-				for ($i = 0; $i < $originalPartsCount; $i++) {
-					if (strtolower($originalParts[$i]) !== strtolower($suffixParts[$i])) {
-						return []; // use alias, not just a case difference
-					}
-				}
-
 				$prefixParts = array_slice($resolvedParts, 0, $resolvedPartsCount - $originalPartsCount);
 				$originalCaseClassName = implode('\\', array_merge($prefixParts, $originalParts));
 			} else {
 				$originalCaseClassName = $originalName->toString();
 			}
 
+			if (strtolower($originalCaseClassName) !== strtolower($resolvedName)) {
+				// use alias, not just a case difference
+				return [];
+			}
+
 			if ($originalCaseClassName === $resolvedName) {
 				return [];
 			}