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Thread-Topic: [PHP-DEV] RFC: Property get/set syntax (added isset/unset and
 references)
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Date: Tue, 24 Apr 2012 12:31:16 +0000
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Subject: [PHP-DEV] RFC: Property get/set syntax (added isset/unset and
 references)
From: cpriest@zerocue.com (Clint M Priest)

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I've updated the RFC to include details on adding isset/unset as well as re=
ferences, detailed below:

isset/unset:

class TimePeriod {
    private $Seconds =3D 3600;

    public $Hours {
        get { return $this->Seconds / 3600; }
        set { $this->Seconds =3D $value; }
        isset { return !is_null($this->Seconds); }
        unset { $this->Seconds =3D NULL; }
    }
}

References:


class SampleClass {

    private $_dataArray =3D array(1,2,5,3);



    public $dataArray {

        &get { return &$this->_dataArray; }

    }

}



$o =3D new SampleClass();

sort($o->dataArray);

/* $o->dataArray =3D=3D array(1,2,3,5); */

Comments?

These would also include automatic implementations which call the respectiv=
e functions on the backing field.  I could see only allowing isset/unset au=
tomatic implementations if get/set were also specified as automatic impleme=
ntations.

Default implementations of isset/unset

I'm also fielding comments/ideas on a way to always provide automatic imple=
mentations of isset/unset for any accessor that didn't define one automatic=
ally.  One idea was for the isset (unspecified implementation) which would =
return true if the getter provided any value which evaluated to true, such =
as this:

class TimePeriod {
    private $Seconds =3D 3600;

    public $Hours {
        get { return $this->Seconds / 3600; }
        set { $this->Seconds =3D $value; }
    }
}
/* Default Implementation Concept */

        isset { return (int)$this->Hours; }
        unset { $this->Hours =3D NULL; }

Note that the automatic implementation of unset is not strictly the same as=
 an unset() but without any sort of unset implementation a call to unset() =
would do nothing.  Alternatively we could throw an error to a call on isset=
 and/or unset against a property which didn't define an implementation.

Thoughts?

-Clint

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