PHP static member inheritance

Question

I have this base class:

<?php

use Parse\ParseObject;
use Parse\ParseQuery;

class BaseModel extends ParseObject
{

    public static $className = 'PlaceHolder';

    public static function query() {
        return new ParseQuery(self::$className);
    }

}

And this child class

<?php

class Post extends BaseModel
{

    public static $className = 'Post';

}

When I call Post::$className I get 'Post' but when I use Post::query() it uses the parent classes value 'PlaceHolder'.

Why does the inherited static function use the value from the parent class?

The query function is in the parent class, and as such self will always be the parent class, it doesn't matter that you've redefined the variable in another class. — adeneo
– adeneo, Commented Apr 6, 2015 at 11:38
The simple solution would be to just pass the classname in as an argument instead. — adeneo
– adeneo, Commented Apr 6, 2015 at 11:39

TiiJ7 · Accepted Answer · 2015-04-06 11:44:12Z

3

The query function is defined in the parent class and will thus use the value of that class. This is a limitation of the self keyword. You will want to look into Late Static Binding to get around this.

public static function query() {
    return new ParseQuery(static::$className);
}

answered Apr 6, 2015 at 11:44

TiiJ7

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