#35899 [Opn->Bgs]: Empty objects returned from simplexml_load_string evaluate to false.

[sniper]

 ID:               35899
 Updated by:       [EMAIL PROTECTED]
 Reported By:      si at tinypla dot net
-Status:           Open
+Status:           Bogus
 Bug Type:         SimpleXML related
 Operating System: RHEL3
 PHP Version:      5.1.1
 New Comment:

Please do not submit the same bug more than once. An existing
bug report already describes this very problem. Even if you feel
that your issue is somewhat different, the resolution is likely
to be the same. 

Thank you for your interest in PHP.




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

[2006-01-05 02:40:33] si at tinypla dot net

Description:
------------
Hi All,
   Firstly, this covers ground in <a
href="http://bugs.php.net/bug.php?id=35028";>bug #35028</a> and is
related, but more specific. 

php 5.1.1 appears to interpret standard empty objects as "true" (as did
5.0.x). 
Unlike 5.0.x (and StdClass() in 5.1.1) empty objects returned from the
simpleXML parser in 5.1.1 appear to be evaluated as "false" when
queried in an if() statement.  

I know we should all be using isset(), but not all programmers play by
these rules, and code which was made based on 5.0.x's way of doing it
doesn't work. If I try and include this code in my app, it breaks. It
could be argued that this logic is counter intuitive.

Reproduce code:
---------------
function runTest($object){
  if($object) { 
    echo "php 5.1.1 evaluates object as true\n";
  } else {
    echo "php 5.1.1 evaluates object as false\n";
  }
  var_dump($object);
}

$object0 = new StdClass();
$object1 = simplexml_load_string('<foo attr="value">bar</foo>');
$object2 = simplexml_load_string('<foo attr="value"></foo>');
$object3 = simplexml_load_string('<foo attr="value" />');

runTest($object0);
runTest($object1);
runTest($object2);
runTest($object3);


Expected result:
----------------
php 5.1.1 evaluates object as true
object(stdClass)#1 (0) {
}

php 5.1.1 evaluates object as true
object(SimpleXMLElement)#2 (1) {
  [0]=>
  string(3) "bar"
}

php 5.1.1 evaluates object as true
object(SimpleXMLElement)#2 (0) {
}

php 5.1.1 evaluates object as true
object(SimpleXMLElement)#2 (0) {
}

Actual result:
--------------
php 5.1.1 evaluates object as true
object(stdClass)#1 (0) {
}

php 5.1.1 evaluates object as true
object(SimpleXMLElement)#2 (1) {
  [0]=>
  string(3) "bar"
}

php 5.1.1 evaluates object as false
object(SimpleXMLElement)#2 (0) {
}

php 5.1.1 evaluates object as false
object(SimpleXMLElement)#2 (0) {
}


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


-- 
Edit this bug report at http://bugs.php.net/?id=35899&edit=1