$my_post['post_category'] = array(215); 
var_dump (  $my_post)   ;
    } 
?>

array(5) {
  ["post_title"]=>
  string(6) "deneme"
  ["post_content"]=>
  string(81) "<iframe width="640" height="360" src="" frameborder="0" allowfullscreen></iframe>"
  ["post_status"]=>
  string(5) "draft"
  ["post_author"]=>
  int(1)
  ["post_category"]=>
  array(1) {
    [0]=>
    int(215)
  }
}