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To: internals@lists.php.net
Cc: Kuba Wieczorek <faw217@gmail.com>
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Organization: ooKoo.org
Date: Sun, 05 Oct 2008 00:01:25 +0200
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Subject: Re: [PHP-DEV] __get() magic method and its use with empty()
	function.
From: karpeles@ookoo.org ("M." =?ISO-8859-1?Q?Karpel=E8s?=)

Hello,

Le samedi 04 octobre 2008 à 22:59 +0200, Kuba Wieczorek a écrit :
> Well, this is a sample code for this:
> 
> <?php
> header('Content-type: text/plain');
> 
> class test
> {
> 	protected $a;
> 	protected $b = 'test';
> 
> 	public function __get($var)
> 	{
> 		return $this->$var;
> 	}
> }
> 
> $test = new test;
> print 'a: ' . var_export($test->a, true) . ' ' . 
> var_export(empty($test->a), true) . "\n";
> print 'b: ' . var_export($test->b, true) . ' ' . 
> var_export(empty($test->b), true) . "\n";
> ?>
> 
> This is the current result:
> a: NULL true
> b: 'test' true
> 
> The expected one should be:
> a: NULL true
> b: 'test' false

Please implement magic method __isset($var) and try again. You'll see it
works fine this way.

Did a little test :

class test {
	private $a;
	private $b = 'foo';

	public function __get($var) {
		echo "__get($var)\n";
		return $this->$var;
	}

	public function __isset($var) {
		echo "__isset($var)\n";
		return isset($this->$var);
	}
}

$t = new test();

var_dump($t->a, empty($t->a));
var_dump($t->b, empty($t->b));

Output :

__get(a)
__isset(a)
NULL
bool(true)
__get(b)
__isset(b)
__get(b)
string(3) "foo"
bool(false)


Mark