From: [EMAIL PROTECTED]
Operating system: RedHat 8.0
PHP version: 4.2.2
PHP Bug Type: Zend Engine 2 problem
Bug description: strange behaviour regarding $this
We have found a strange behaviour regarding $this. One of our programmers
made a mistake during programming, which led to "Heisenbugs", which were
not quite easy to find and fix. We could reduce the problem to a simple
program to present it:
<?
class Foo {
var $bla;
function quux() {
$this->bla = 5;
}
}
class Bar {
var $bla;
function do_stuff() {
$this->bla = 10;
Foo::quux();
echo $this->bla;
}
}
$blabla = new Bar;
$blabla->do_stuff();
?>
The output is: "5"
Obviously, Bar::do_stuff() is not allowed to call Foo::quux() since
Foo::quux() is using $this. Now the strange thing comes: instead of
casting an error, PHP happily accepts the code. But the $this in Foo::quux
is the same $this as in Bar::do_stuff(), i.e. $blabla, and that's why the
output is 5. Is this behaviour intended? At least I couldn't find it
documented anywhere. IMO the user should be warned when $this is used in a
static function.
--
Edit bug report at http://bugs.php.net/?id=20760&edit=1
--
Try a CVS snapshot: http://bugs.php.net/fix.php?id=20760&r=trysnapshot
Fixed in CVS: http://bugs.php.net/fix.php?id=20760&r=fixedcvs
Fixed in release: http://bugs.php.net/fix.php?id=20760&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=20760&r=needtrace
Try newer version: http://bugs.php.net/fix.php?id=20760&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=20760&r=support
Expected behavior: http://bugs.php.net/fix.php?id=20760&r=notwrong
Not enough info: http://bugs.php.net/fix.php?id=20760&r=notenoughinfo
Submitted twice: http://bugs.php.net/fix.php?id=20760&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=20760&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=20760&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=20760&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=20760&r=isapi
