#40797 [NEW]: empty() breaks when overloading with __get

[stephan_schmidt at usa dot com]

From: stephan_schmidt at usa dot com
Operating system: Windows 200X
PHP version: 5.2.1
PHP Bug Type: Class/Object related
Bug description: empty() breaks when overloading with __get

Description:
------------
When overloading with __get() to grab an index of an associative array
inside an object, the overloaded variable returns 'false' when tested with
empty() whether the value is empty or not (see Example 2 for incorrect
results).

Testing overloaded variables that were not in an associative array with
empty() returns the expected results (Example 3).

Reproduce code:
---------------
<?
class A {
public $myArray = array('nonEmptyVar' => 5, 'emptyVar' => '');
function __get($var) {
return $this->myArray[$var];
}
}

class B {
public $nonEmptyVar = 5;
public $emptyVar = '';
function __get($var) {
return $this->$var;
}
}

$a = new A();
$b = new B();

echo '<p>Example 1:<br>';
echo empty($a->myArray['nonEmptyVar']) ? 'empty' : 'not empty';
echo '<br>';
echo empty($a->myArray['emptyVar']) ? 'empty' : 'not empty';

echo '<p>Example 2:<br>';
var_dump($a->nonEmptyVar);
echo empty($a->nonEmptyVar) ? 'empty' : 'not empty';
echo '<br>';
var_dump($a->emptyVar);
echo empty($a->emptyVar) ? 'empty' : 'not empty';

echo '<p>Example 3:<br>';
echo empty($b->nonEmptyVar) ? 'empty' : 'not empty';
echo '<br>';
echo empty($b->emptyVar) ? 'empty' : 'not empty';
?>

Expected result:
----------------
Example 1:
not empty
empty

Example 2:
int(5) not empty
string(0) "" empty

Example 3:
not empty
empty

Actual result:
--------------
Example 1:
not empty
empty

Example 2:
int(5) empty
string(0) "" empty

Example 3:
not empty
empty

--
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[tony2001@php.net]

ID: 40797
Updated by: [email]tony2001@php.net[/email]
Reported By: stephan_schmidt at usa dot com
-Status: Open
+Status: Feedback
Bug Type: Class/Object related
Operating System: Windows 200X
PHP Version: 5.2.1
New Comment:

That's exactly how it works here.
Make sure you've disable any zend_extensions.


Previous Comments:
------------------------------------------------------------------------

[2007-03-13 23:57:17] stephan_schmidt at usa dot com

Description:
------------
When overloading with __get() to grab an index of an associative array
inside an object, the overloaded variable returns 'false' when tested
with empty() whether the value is empty or not (see Example 2 for
incorrect results).

Testing overloaded variables that were not in an associative array with
empty() returns the expected results (Example 3).

Reproduce code:
---------------
<?
class A {
public $myArray = array('nonEmptyVar' => 5, 'emptyVar' => '');
function __get($var) {
return $this->myArray[$var];
}
}

class B {
public $nonEmptyVar = 5;
public $emptyVar = '';
function __get($var) {
return $this->$var;
}
}

$a = new A();
$b = new B();

echo '<p>Example 1:<br>';
echo empty($a->myArray['nonEmptyVar']) ? 'empty' : 'not empty';
echo '<br>';
echo empty($a->myArray['emptyVar']) ? 'empty' : 'not empty';

echo '<p>Example 2:<br>';
var_dump($a->nonEmptyVar);
echo empty($a->nonEmptyVar) ? 'empty' : 'not empty';
echo '<br>';
var_dump($a->emptyVar);
echo empty($a->emptyVar) ? 'empty' : 'not empty';

echo '<p>Example 3:<br>';
echo empty($b->nonEmptyVar) ? 'empty' : 'not empty';
echo '<br>';
echo empty($b->emptyVar) ? 'empty' : 'not empty';
?>

Expected result:
----------------
Example 1:
not empty
empty

Example 2:
int(5) not empty
string(0) "" empty

Example 3:
not empty
empty

Actual result:
--------------
Example 1:
not empty
empty

Example 2:
int(5) empty
string(0) "" empty

Example 3:
not empty
empty


------------------------------------------------------------------------


--
Edit this bug report at [url]http://bugs.php.net/?id=40797&edit=1[/url]

[stephan_schmidt at usa dot com]

ID: 40797
User updated by: stephan_schmidt at usa dot com
Reported By: stephan_schmidt at usa dot com
-Status: Feedback
+Status: Open
Bug Type: Class/Object related
Operating System: Windows 200X
PHP Version: 5.2.1
New Comment:

The "Actual Results" were from the results of the above script run on a
clean install of PHP 5.2.1 (Win 2000 SP4). No zend extensions are
present or in use.

The code above did not run as expected on any of the Win 200X servers
it was tested on. Line 6 of the output read "int(5) empty" in every
test case.

I suspect it may have to do with the fact that empty() does not accept
a function call as a parameter (i.e. empty(trim($myVar))) since
overloading calls __get. However, one would expect it to also result in
a fatal error if that were the case.


Previous Comments:
------------------------------------------------------------------------

[2007-03-14 00:11:15] [email]tony2001@php.net[/email]

That's exactly how it works here.
Make sure you've disable any zend_extensions.

------------------------------------------------------------------------

[2007-03-13 23:57:17] stephan_schmidt at usa dot com

Description:
------------
When overloading with __get() to grab an index of an associative array
inside an object, the overloaded variable returns 'false' when tested
with empty() whether the value is empty or not (see Example 2 for
incorrect results).

Testing overloaded variables that were not in an associative array with
empty() returns the expected results (Example 3).

Reproduce code:
---------------
<?
class A {
public $myArray = array('nonEmptyVar' => 5, 'emptyVar' => '');
function __get($var) {
return $this->myArray[$var];
}
}

class B {
public $nonEmptyVar = 5;
public $emptyVar = '';
function __get($var) {
return $this->$var;
}
}

$a = new A();
$b = new B();

echo '<p>Example 1:<br>';
echo empty($a->myArray['nonEmptyVar']) ? 'empty' : 'not empty';
echo '<br>';
echo empty($a->myArray['emptyVar']) ? 'empty' : 'not empty';

echo '<p>Example 2:<br>';
var_dump($a->nonEmptyVar);
echo empty($a->nonEmptyVar) ? 'empty' : 'not empty';
echo '<br>';
var_dump($a->emptyVar);
echo empty($a->emptyVar) ? 'empty' : 'not empty';

echo '<p>Example 3:<br>';
echo empty($b->nonEmptyVar) ? 'empty' : 'not empty';
echo '<br>';
echo empty($b->emptyVar) ? 'empty' : 'not empty';
?>

Expected result:
----------------
Example 1:
not empty
empty

Example 2:
int(5) not empty
string(0) "" empty

Example 3:
not empty
empty

Actual result:
--------------
Example 1:
not empty
empty

Example 2:
int(5) empty
string(0) "" empty

Example 3:
not empty
empty


------------------------------------------------------------------------


--
Edit this bug report at [url]http://bugs.php.net/?id=40797&edit=1[/url]