fix combinations count

Author: staabm

src/Type/Php/ImplodeFunctionReturnTypeExtension.php

@@ -22,7 +22,6 @@
 use function count;
 use function implode;
 use function in_array;
-use const COUNT_RECURSIVE;
 
 final class ImplodeFunctionReturnTypeExtension implements DynamicFunctionReturnTypeExtension
 {
@@ -116,15 +115,17 @@ private function inferConstantType(ConstantArrayType $arrayType, ConstantStringT
 			$valueTypes = $array->getValueTypes();
 
 			$arrayValues = [];
+			$combinationsCount = 1;
 			foreach ($valueTypes as $valueType) {
 				$constScalars = $valueType->getConstantScalarValues();
 				if (count($constScalars) === 0) {
 					return null;
 				}
 				$arrayValues[] = $constScalars;
+				$combinationsCount *= count($constScalars);
 			}
 
-			if (count($strings) + count($arrayValues, COUNT_RECURSIVE) > InitializerExprTypeResolver::CALCULATE_SCALARS_LIMIT) {
+			if ($combinationsCount > InitializerExprTypeResolver::CALCULATE_SCALARS_LIMIT) {
 				return null;
 			}
 
@@ -134,6 +135,10 @@ private function inferConstantType(ConstantArrayType $arrayType, ConstantStringT
 			}
 		}
 
+		if (count($strings) > InitializerExprTypeResolver::CALCULATE_SCALARS_LIMIT) {
+			return null;
+		}
+
 		return TypeCombinator::union(...$strings);
 	}