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<?php class BaseRoProp { protected $title; protected $data; public function __construct( $title, $data ) { $this->title = $title; $this->data = $data; } } class RoProp extends BaseRoProp { public function __get(string $name) { if(property_exists($this, $name)){ return $this->$name; }else{ new \Exception('No property'); } } public function addToProperty($name, $value) { $this->$name .= $value; } } $roObj = new RoProp('title 1', 'data 1'); $r0Obj = addToProperty('title', ' added title'); printf('Class RoProp. Read only property Title value: %s', $roObj->title); $roBaseObj = new BaseRoProp('title 1', 'data 1'); printf('Class BaseRoProp. Read only property Title value: %s', $roBaseObj->title);