php - How to check if the mysqli_object has been freed? -

i need check if mysqli_result has been freed.

with ext/mysql functions function is_resource

i tried checking if $result istance of mysqli_result, after been freed $result still mysqli_result object

$db = mysqli_connect("myhost", "myuser", "mypass", "mydb"); $result = $db->query("select * mytable"); $result->free(); var_dump(is_a($result, "mysqli_result")); // => true, if freed 

cant wrap in function or method?

class result {     private $result;      public function __construct(mysqli_result $result) {         $this->result = $result;     }      public function getresult() {         return $this->result;     }      public function free() {         $this->result->free();         $this->result = null;     }      public function __destruct() {         $this->free();     } }