Edit report at http://bugs.php.net/bug.php?id=52482&edit=1
ID: 52482
User updated by: sjon at react dot com
Reported by: sjon at react dot com
Summary: Casting SimpleXMLElement('0') to boolean results in
true
Status: Open
Type: Feature/Change Request
Package: SimpleXML related
Operating System: Linux
PHP Version: Irrelevant
Block user comment: N
New Comment:
Then why does this work correctly?
var_dump((int)new SimpleXMLElement("<w>2</w>")); (returns int(2))
The reason is SimpleXMLElements do not follow the normal rules, have a
look at simplexml.c line 1762:
if (type == IS_BOOL) {
node = php_sxe_get_first_node(sxe, NULL TSRMLS_CC);
prop_hash = sxe_get_prop_hash(readobj, 1 TSRMLS_CC);
INIT_PZVAL(writeobj);
ZVAL_BOOL(writeobj, node != NULL ||
zend_hash_num_elements(prop_hash) > 0);
zend_hash_destroy(prop_hash);
efree(prop_hash);
return SUCCESS;
}
Previous Comments:
------------------------------------------------------------------------
[2010-07-29 11:02:50] sala...@php.net
You are not casting the string "0" to boolean, you're casting the
object. As such,
it follows normal rules for casting objects. The only time a
SimpleXMLElement will
cast to boolean false is with an "empty" element (e.g. "<w/>").
If you want your sample element to cast to false, you will first need to
cast to a
string: (bool) (string) new SimpleXMLElement...
------------------------------------------------------------------------
[2010-07-29 10:50:11] sjon at react dot com
Description:
------------
I understand the bug I am reporting is described in the manual, which is
why I am reporting it as a feature request. When casting
SimpleXMLElements to boolean, most values comply with the way PHP casts
them. There is however one exception: the string '0' is cast to true,
which is unexpected. This is especially annoying when using XmlRpc,
which uses <boolean>0</boolean> for its values.
Test script:
---------------
<?php
var_dump((bool)new SimpleXMLElement("<w>0</w>"));
Expected result:
----------------
bool(false)
Actual result:
--------------
bool(true)
------------------------------------------------------------------------
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Edit this bug report at http://bugs.php.net/bug.php?id=52482&edit=1
