stmtsManipulator = $stmtsManipulator; $this->betterNodeFinder = $betterNodeFinder; $this->exprUsedInNodeAnalyzer = $exprUsedInNodeAnalyzer; } public function getRuleDefinition() : RuleDefinition { return new RuleDefinition('Remove unused variable in catch()', [new CodeSample(<<<'CODE_SAMPLE' final class SomeClass { public function run() { try { } catch (Throwable $notUsedThrowable) { } } } CODE_SAMPLE , <<<'CODE_SAMPLE' final class SomeClass { public function run() { try { } catch (Throwable) { } } } CODE_SAMPLE )]); } /** * @return array> */ public function getNodeTypes() : array { return [StmtsAwareInterface::class]; } /** * @param StmtsAwareInterface $node */ public function refactor(Node $node) : ?Node { if ($node->stmts === null) { return null; } $hasChanged = \false; foreach ($node->stmts as $key => $stmt) { if (!$stmt instanceof TryCatch) { continue; } foreach ($stmt->catches as $catch) { $caughtVar = $catch->var; if (!$caughtVar instanceof Variable) { continue; } /** @var string $variableName */ $variableName = $this->getName($caughtVar); $isFoundInCatchStmts = (bool) $this->betterNodeFinder->findFirst($catch->stmts, function (Node $subNode) use($caughtVar) : bool { return $this->exprUsedInNodeAnalyzer->isUsed($subNode, $caughtVar); }); if ($isFoundInCatchStmts) { continue; } if ($this->stmtsManipulator->isVariableUsedInNextStmt($node, $key + 1, $variableName)) { continue; } $catch->var = null; $hasChanged = \true; } } if ($hasChanged) { return $node; } return null; } public function provideMinPhpVersion() : int { return PhpVersionFeature::NON_CAPTURING_CATCH; } }