Only treat constants as deprecated on PHP≥7.3

Author: cs278

src/Rules/Deprecations/FetchingDeprecatedConstRule.php

@@ -17,14 +17,17 @@ class FetchingDeprecatedConstRule implements \PHPStan\Rules\Rule
 	private $reflectionProvider;
 
 	/** @var array<string,string> */
-	private $deprecatedConstants = [
-		'FILTER_FLAG_SCHEME_REQUIRED' => 'Use of constant %s is deprecated since PHP 7.3.',
-		'FILTER_FLAG_HOST_REQUIRED' => 'Use of constant %s is deprecated since PHP 7.3.',
-	];
+	private $deprecatedConstants = [];
 
 	public function __construct(ReflectionProvider $reflectionProvider)
 	{
 		$this->reflectionProvider = $reflectionProvider;
+
+		// phpcs:ignore SlevomatCodingStandard.ControlStructures.EarlyExit.EarlyExitNotUsed
+		if (PHP_VERSION_ID >= 70300) {
+			$this->deprecatedConstants['FILTER_FLAG_SCHEME_REQUIRED'] = 'Use of constant %s is deprecated since PHP 7.3.';
+			$this->deprecatedConstants['FILTER_FLAG_HOST_REQUIRED'] = 'Use of constant %s is deprecated since PHP 7.3.';
+		}
 	}
 
 	public function getNodeType(): string

tests/Rules/Deprecations/FetchingDeprecatedConstRuleTest.php

@@ -19,35 +19,39 @@ public function testFetchingDeprecatedConst(): void
 			$this->markTestSkipped('Required constants are not available, PHP≥8?');
 		}
 
+		$expectedErrors = [];
+
+		if (PHP_VERSION_ID >= 70300) {
+			$expectedErrors[] = [
+				'Use of constant FILTER_FLAG_SCHEME_REQUIRED is deprecated since PHP 7.3.',
+				5,
+			];
+			$expectedErrors[] = [
+				'Use of constant FILTER_FLAG_HOST_REQUIRED is deprecated since PHP 7.3.',
+				6,
+			];
+			$expectedErrors[] = [
+				'Use of constant FILTER_FLAG_SCHEME_REQUIRED is deprecated since PHP 7.3.',
+				7,
+			];
+			$expectedErrors[] = [
+				'Use of constant FILTER_FLAG_HOST_REQUIRED is deprecated since PHP 7.3.',
+				8,
+			];
+			$expectedErrors[] = [
+				'Use of constant FILTER_FLAG_SCHEME_REQUIRED is deprecated since PHP 7.3.',
+				37,
+			];
+			$expectedErrors[] = [
+				'Use of constant FILTER_FLAG_HOST_REQUIRED is deprecated since PHP 7.3.',
+				38,
+			];
+		}
+
 		require_once __DIR__ . '/data/fetching-deprecated-const-definition.php';
 		$this->analyse(
 			[__DIR__ . '/data/fetching-deprecated-const.php'],
-			[
-				[
-					'Use of constant FILTER_FLAG_SCHEME_REQUIRED is deprecated since PHP 7.3.',
-					5,
-				],
-				[
-					'Use of constant FILTER_FLAG_HOST_REQUIRED is deprecated since PHP 7.3.',
-					6,
-				],
-				[
-					'Use of constant FILTER_FLAG_SCHEME_REQUIRED is deprecated since PHP 7.3.',
-					7,
-				],
-				[
-					'Use of constant FILTER_FLAG_HOST_REQUIRED is deprecated since PHP 7.3.',
-					8,
-				],
-				[
-					'Use of constant FILTER_FLAG_SCHEME_REQUIRED is deprecated since PHP 7.3.',
-					37,
-				],
-				[
-					'Use of constant FILTER_FLAG_HOST_REQUIRED is deprecated since PHP 7.3.',
-					38,
-				],
-			]
+			$expectedErrors
 		);
 	}