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Date: Wed, 18 Jul 2007 13:41:32 -0700
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To: Arnold Daniels <info@adaniels.nl>
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Subject: Re: private_write/protected_write properties
From: pollita@php.net (Sara Golemon)

> I'll probably be lynched for bringing up this subject again, since it 
> caused a long discussion a year ago. Anyway I look in the archives and 
> there was never a real conclusion made, so I'm bringing it up again. 
> This time for a feature I personally would like to see in PHP 6.
> 
> Very often I want to be able to be get a property publicly, while only 
> being able to set it within the class. You can solve this by using a 
> getPropery() method or by using __get($property), but this feels more 
> like a workaround. I think the private/public state of properties is 
> becoming more important now that using public frameworks is becoming 
> main stream. Therefor I believe this would be a good addition.
> 
Unfortunately, there are a few caveats to this when used with objects, 
resources, and arrays.  The simplest way to explain would be to show 
some sample code:

class foo {
   public $bar = 'baz';
}

class myclass {
   protected_write $f;
   private_write $fp;

   function __construct() {
     $this->f = new foo;

     $this->fp = fopen('somefile.txt', 'r');
   }
}

$m = new myclass;

$F = $myclass->f;
$F->bar = 'blong';

$FP = $myclass->fp;
fclose($FP);


The explanation of arrays is a bit more involved, but it's got some 
gotchas too...