php magic setters - modified child properties -

lets say, have following php class:

class product {     protected $data = array();     protected $modified = false;      public function __construct($data) {         $this->data = $data;     }      public function & __get($name) {         if(array_key_exists($name, $this->data)) {             return $this->data->$name;         }          $null = null;          return $null;     }      public function __set($name, $value) {         $this->data->$name = $value;         $this->modified = true;     }         } $obj = new product([]); 

if set value (for example $obj->name = "name";), class property $modified set true. thats want achive.

but somehow possible, "track" modifications, if done in object values? example:

$property = new stdclass(); $property->name = "name of prop"; $obj = new product([     "name" => "name",     "someobject" => $property ]);  // here comes change $obj->someobject->name = "new name"; 

because code above, $obj->modified false

i guess, have pass new value "set" function. way changes value without going function declared, "modified" turns true.

like maybe?

$obj->someobject->__set($name, 'new name');