如何在PHP中将get和set方法/函数指定为类的属性的一部分？

Question

Using PHP, how do I define/declare getter and setter methods/functions as part of the declaration of a property in a class?

What I'm trying to do is specify the getter and setter methods as part of a property, instead of declaring separate set_propertyName($value) and get_propertyName() functions/methods.

What I've got:

class my_entity {
    protected $is_new;
    protected $eid; // entity ID for an existing entity
    public function __construct($is_new = FALSE, $eid = 0) {
        $this->is_new = $is_new;
        if ($eid > 0) {
            $this->set_eid($eid);
        }
    }

    // setter method
    public function set_eid($eid) {
        $is_set = FALSE;
        if (is_numeric($eid)) {
            $this->eid = intval($eid);
            $is_set = TRUE;
        }
        return $is_set;
    }
}

What I want (without making $this->eid an object):

class my_entity {
    protected $is_new;
    // entity ID for an existing entity
    protected $eid {
      set: function($value) {
        $is_set = FALSE;
        if (is_numeric($value)) {
            $this->eid = intval($value);
            $is_set = TRUE;
        }
        return $is_set;

      }, // end setter

    }; 
    public function __construct($is_new = FALSE, $eid = 0) {
        $this->is_new = $is_new;
        if ($eid > 0) {
            $this->set_eid($eid);
        }
    }

    // setter method/function removed
}

Answer 1

This was proposed for PHP 5.5, but the vote failed to get the necessary 2/3 majority required to accept it into core, so it won't be implemented (despite the code to implement that change having been submitted).

It's entirely possible (with the plethora of new PHP engines and Hacklang currently appearing) that it will be resubmitted at a future time, especially if Hacklang decides to implement it; but for the moment the option of using C# getters/setters isn't available in PHP