Move args count check before expensive phpVersion/reflectionProvider checks in FilterVarRule

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: phpstan-bot

src/Rules/Functions/FilterVarRule.php

@@ -46,17 +46,17 @@ public function processNode(Node $node, Scope $scope): array
 
 		$args = $node->getArgs();
 
+		if (count($args) < 3) {
+			return [];
+		}
+
 		if (
 			!$this->phpVersion->hasFilterThrowOnFailureConstant()
 			|| !$this->reflectionProvider->hasConstant(new Name\FullyQualified('FILTER_THROW_ON_FAILURE'), null)
 		) {
 			return [];
 		}
 
-		if (count($args) < 3) {
-			return [];
-		}
-
 		$flagsType = $scope->getType($args[2]->value);
 
 		if ($this->filterFunctionReturnTypeHelper->hasFlag('FILTER_NULL_ON_FAILURE', $flagsType)