php - When I do a successful insert, mysql_insert_id() returns 0 -

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i have class db.

when insert (a success one) calling function singlequery, $id=mysql_insert_id(); returns me 0. why?

i want auto_increment id.

what doing wrong?

thanks!

class database{      //atributos     private $connectionstring="mysql:host=localhost;dbname=practica";     private $user="root"; //usuario de la bbdd con permisos filtrados     private $password="root";     private $db;        private function connect(){          $flag=true;         try{             $this->db = new pdo($this->connectionstring, $this->user, $this->password);           }catch(pdoexception $e) {             $flag=false;         }         return $flag;     }      private function disconnect(){         $this->db=null;     }      public function singlequery($sql,$vector){         //insert, update, delete         if($this->connect()){             $fla="products";              $posicion = strpos($sql,$fla);              if ($posicion === false) //normal             {                 //code              } else //especial x productes x obtenir la id del prod. insertat             {                  $sentencia = $this->db->prepare($sql);                  $sentencia->execute($vector);                 $id=mysql_insert_id(); //the problem here                 $cuenta = $sentencia->rowcount();                  echo $id; //prints 0 :(             }             $this->disconnect();         }else{             $cuenta=-1;         }         return $cuenta;     }


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