From 28b69d51758e34ab12e8b5e33be5506bf87ed101 Mon Sep 17 00:00:00 2001
From: Takashi Kanemoto <ttskch@gmail.com>
Date: Thu, 30 Oct 2025 14:37:19 +0900
Subject: [PATCH 1/2] =?UTF-8?q?fix:=20=F0=9F=90=9B=20eliminate=20duplicate?=
 =?UTF-8?q?=20keys=20in=20the=20constructor=20of=20`Parameters`?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 src/Metadata/Parameters.php | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/Metadata/Parameters.php b/src/Metadata/Parameters.php
index 2f20937cb64..0bb13dabf70 100644
--- a/src/Metadata/Parameters.php
+++ b/src/Metadata/Parameters.php
@@ -37,9 +37,13 @@ public function __construct(array $parameters = [])
                 $parameterName = $parameter->getKey();
             }
 
-            $this->parameters[] = [$parameterName, $parameter];
+            $key = \sprintf('%s.%s', $parameter::class, $parameterName);
+
+            $this->parameters[$key] = [$parameterName, $parameter];
         }
 
+        $this->parameters = array_values($this->parameters);
+
         $this->sort();
     }
 

From 05712d334e99ca48658afab71c55a1705d0c2a0c Mon Sep 17 00:00:00 2001
From: Takashi Kanemoto <ttskch@gmail.com>
Date: Thu, 30 Oct 2025 16:36:06 +0900
Subject: [PATCH 2/2] =?UTF-8?q?test:=20=F0=9F=92=8D=20add=20tests?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 src/Metadata/Tests/ParametersTest.php | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/src/Metadata/Tests/ParametersTest.php b/src/Metadata/Tests/ParametersTest.php
index 6b7b5583390..edc26ff817a 100644
--- a/src/Metadata/Tests/ParametersTest.php
+++ b/src/Metadata/Tests/ParametersTest.php
@@ -13,6 +13,7 @@
 
 namespace ApiPlatform\Metadata\Tests;
 
+use ApiPlatform\Metadata\HeaderParameter;
 use ApiPlatform\Metadata\Parameters;
 use ApiPlatform\Metadata\QueryParameter;
 use PHPUnit\Framework\TestCase;
@@ -25,4 +26,27 @@ public function testDefaultValue(): void
         $parameters = new Parameters(['a' => $r]);
         $this->assertSame($r, $parameters->get('a'));
     }
+
+    public function testDuplicated(): void
+    {
+        $r1 = new QueryParameter(key: 'a');
+        $r2 = new QueryParameter(key: 'b');
+        $r3 = new HeaderParameter(key: 'a');
+        $r4 = new HeaderParameter(key: 'b');
+        $parameters = new Parameters([$r1, $r2, $r3, $r4]);
+        $this->assertCount(4, $parameters);
+        $this->assertSame($r1, $parameters->get('a'));
+        $this->assertSame($r2, $parameters->get('b'));
+        $this->assertSame($r3, $parameters->get('a', HeaderParameter::class));
+        $this->assertSame($r4, $parameters->get('b', HeaderParameter::class));
+
+        $r1 = new QueryParameter(key: 'a');
+        $r2 = new QueryParameter(key: 'a');
+        $r3 = new HeaderParameter(key: 'a');
+        $r4 = new HeaderParameter(key: 'a');
+        $parameters = new Parameters([$r1, $r2, $r3, $r4]);
+        $this->assertCount(2, $parameters);
+        $this->assertSame($r2, $parameters->get('a'));
+        $this->assertSame($r4, $parameters->get('a', HeaderParameter::class));
+    }
 }