Report uses of deprecated constants

src/Reflection/BetterReflection/BetterReflectionProvider.php

@@ -43,6 +43,7 @@
 use PHPStan\Reflection\SignatureMap\NativeFunctionReflectionProvider;
 use PHPStan\Reflection\SignatureMap\SignatureMapProvider;
 use PHPStan\ShouldNotHappenException;
+use PHPStan\TrinaryLogic;
 use PHPStan\Type\FileTypeMapper;
 use PHPStan\Type\Generic\TemplateTypeMap;
 use PHPStan\Type\Type;
@@ -360,11 +361,25 @@ public function getConstant(Node\Name $nameNode, ?NamespaceAnswerer $namespaceAn
 		$constantReflection = $this->reflector->reflectConstant($constantName);
 		$fileName = $constantReflection->getFileName();
 		$constantValueType = $this->initializerExprTypeResolver->getType($constantReflection->getValueExpression(), InitializerExprContext::fromGlobalConstant($constantReflection));
+		$docComment = $constantReflection->getDocComment();
+
+		$isDeprecated = TrinaryLogic::createNo();
+		$deprecatedDescription = null;
+		if ($docComment !== null) {
+			$resolvedPhpDoc = $this->fileTypeMapper->getResolvedPhpDoc($fileName, null, null, null, $docComment);
+			$isDeprecated = TrinaryLogic::createFromBoolean($resolvedPhpDoc->isDeprecated());
+
+			if ($resolvedPhpDoc->isDeprecated() && $resolvedPhpDoc->getDeprecatedTag() !== null) {
+				$deprecatedDescription = $resolvedPhpDoc->getDeprecatedTag()->getMessage();
+			}
+		}
 
 		return $this->cachedConstants[$constantName] = new RuntimeConstantReflection(
 			$constantName,
 			$constantValueType,
 			$fileName,
+			$isDeprecated,
+			$deprecatedDescription,
 		);
 	}
 

src/Reflection/Constant/RuntimeConstantReflection.php

@@ -13,6 +13,8 @@ public function __construct(
 		private string $name,
 		private Type $valueType,
 		private ?string $fileName,
+		private TrinaryLogic $isDeprecated,
+		private ?string $deprecatedDescription,
 	)
 	{
 	}
@@ -34,12 +36,12 @@ public function getFileName(): ?string
 
 	public function isDeprecated(): TrinaryLogic
 	{
-		return TrinaryLogic::createNo();
+		return $this->isDeprecated;
 	}
 
 	public function getDeprecatedDescription(): ?string
 	{
-		return null;
+		return $this->deprecatedDescription;
 	}
 
 	public function isInternal(): TrinaryLogic

tests/PHPStan/Reflection/Constant/RuntimeConstantReflectionTest.php

@@ -0,0 +1,59 @@
+<?php declare(strict_types = 1);
+
+namespace PHPStan\Reflection\Constant;
+
+use PhpParser\Node\Name;
+use PHPStan\Testing\PHPStanTestCase;
+use PHPStan\TrinaryLogic;
+use const PHP_VERSION_ID;
+
+class RuntimeConstantReflectionTest extends PHPStanTestCase
+{
+
+	public function dataDeprecatedConstants(): iterable
+	{
+		if (PHP_VERSION_ID >= 80100) {
+			yield [
+				new Name('\FILTER_SANITIZE_STRING'),
+				TrinaryLogic::createYes(),
+				'8.1', // deprecation message used in e.g. https://github.com/JetBrains/phpstorm-stubs/blob/9608c953230b08f07b703ecfe459cc58d5421437/filter/filter.php#L478
+			];
+		}
+		yield [
+			new Name('\CURLOPT_FTP_SSL'),
+			TrinaryLogic::createYes(),
+			'use <b>CURLOPT_USE_SSL</b> instead.',
+		];
+
+		yield [
+			new Name('\DeprecatedConst\FINE'),
+			TrinaryLogic::createNo(),
+			null,
+		];
+		yield [
+			new Name('\DeprecatedConst\MY_CONST'),
+			TrinaryLogic::createYes(),
+			null,
+		];
+		yield [
+			new Name('\DeprecatedConst\MY_CONST2'),
+			TrinaryLogic::createYes(),
+			"don't use it!",
+		];
+	}
+
+	/**
+	 * @dataProvider dataDeprecatedConstants
+	 */
+	public function testDeprecatedConstants(Name $constName, TrinaryLogic $isDeprecated, ?string $deprecationMessage): void
+	{
+		require_once __DIR__ . '/data/deprecated-constant.php';
+
+		$reflectionProvider = $this->createReflectionProvider();
+
+		$this->assertTrue($reflectionProvider->hasConstant($constName, null));
+		$this->assertSame($isDeprecated, $reflectionProvider->getConstant($constName, null)->isDeprecated());
+		$this->assertSame($deprecationMessage, $reflectionProvider->getConstant($constName, null)->getDeprecatedDescription());
+	}
+
+}

tests/PHPStan/Reflection/Constant/data/deprecated-constant.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace DeprecatedConst;
+
+const FINE = '1';
+
+/**
+ * @deprecated
+ */
+const MY_CONST = '1';
+
+/**
+ * @deprecated don't use it!
+ */
+const MY_CONST2 = '1';