feat: Handle case when preg_split returns false

Author: malsuke

src/Type/Php/PregSplitDynamicReturnTypeExtension.php

@@ -157,6 +157,9 @@ public function getTypeFromFunctionCall(FunctionReflection $functionReflection,
 				foreach ($limits as $limit) {
 					foreach ($flags as $flag) {
 						$result = @preg_split($patternConstantType->getValue(), $subjectConstantType->getValue(), (int) $limit, (int) $flag);
+						if ($result === false) {
+							return new ErrorType();
+						}
 						$constantArray = ConstantArrayTypeBuilder::createEmpty();
 						foreach ($result as $key => $value) {
 							if (is_array($value)) {