Get Classname of Inherited Class when using Scope Resolution Operator (::)

Question

Possible Duplicate:
Functionality of PHP get_class

For a small ORM-ish class-set, I have the following:

class Record {
  //Implementation is simplified, details out of scope for this question.
  static public function table() {
    return strtolower(preg_replace('/([a-z])([A-Z])/', '$1_$2', get_class()))."s";
  }

  static public function find($conditions) {
    //... db-selection calls go here.
    var_dump(self::table());
  }
}

class Payment extends Record {
}

class Order extends Record {
  public $id = 12;
  public function payments() {
    $this->payments = Payment::find(array('order_id', $this->id, '='));
  }
}

$order = new Order();
$order->payments();
#=> string(7) "records"

I would expect this code to print:

#=> string(8) "payments"

But, instead, it prints records. I have tried self::table(), but that gives the same result.

Edit, after some questions in the comments table() is a method that simply maps the name of the Class to the table in wich its objects live: Order lives in orders, Payment lives in payments; records does not exist!). When I call Payments::find(), I expect it to search on the table payments, not on the table records, nor on the table orders.

What am I doing wrong? How can I get the classname of the class on which ::is called, instead of the class in which is was defined?

Important part is probably the get_class(), not being able to return the proper classname.

@lanzz: no, but it is very much related to [get classname from static call in extended class](http://stackoverflow.com/questions/506705/php-get-classname-from-static-call-in-extended-class?rq=1) — berkes, Sep 13 '12 at 14:05
Sorry, didn't notice your call is static, since your method is incorrectly declared as not static. — lanzz, Sep 13 '12 at 14:06
Referencing `$this` in a static method is an error (in your `Payment::find` method). — lanzz, Sep 13 '12 at 14:09
Lanzz: thanks. I edited without compiling/running. Changed to reflect the static-declarations in my last edit. — berkes, Sep 13 '12 at 14:12
Calling `self::table()` destroys whatever inheritance context you might have had, as `self` always points to the class you have _defined_ the method in, not the one that has inherited it. Perhaps `static::table()` might do? But still, `get_class()` without argument is defined to also return the class the calling method is defined in, not the LSB one. — lanzz, Sep 13 '12 at 14:15
@lanzz: got it! `static::table()` and then `get_called_class()` did the trick. If you make it an answer, I can accept. Thanks! — berkes, Sep 13 '12 at 14:24

Asciiom · Accepted Answer · 2012-09-13T14:27:13.847

4

You can use get_called_class if you're using php 5.3 or higher. It gives you the class the static method is called on, not the one where the method is actually defined.

UPDATE

You need the class name of the class on which 'find' is called. You can fetch the class name in the find method and provide it as a parameter to the table (maybe rename it to getTableForClass($class)) method. get_called_class will give you the Payment class, the table method derives the table name and returns it:

class Record {
    //Implementation is simplified, details out of scope for this question.
    static public function getTableForClass($class) {
        return strtolower(preg_replace('/([a-z])([A-Z])/', '$1_$2', $class))."s";
    }

    static public function find($conditions) {
        //... db-selection calls go here.
        $className = get_called_class();
        $tableName = self::getTableForClass($class);

        var_dump($tableName);
    }
 }

edited Sep 13 '12 at 14:27

answered Sep 13 '12 at 13:58

Asciiom

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When changing to get_called_class() as explained on [PHPs docs on late static binding](http://www.php.net/manual/en/function.get-called-class.php), I now get `orders`. Whereas I want `records`. – berkes Sep 13 '12 at 14:06
In your question you say you don't expect 'records' but 'payments'. I'm not sure what you want now. :) You can use `__CLASS__` if you need it to print 'Records'. – Asciiom Sep 13 '12 at 14:11
table() is a method that simply maps the name of the Class to the table in wich its objects live (Order lives in orders, Payment, lives in payments; records does not exist!). When I call Payments::find(), I expect it to search on the table "payments", not on the table "records", nor on the table "orders"). Will add that to the question to clarify it. Thanks – berkes Sep 13 '12 at 14:17

Get Classname of Inherited Class when using Scope Resolution Operator (::)

1 Answers1