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Doc Bug #47402 call_user_func propagating the scope while it didn't in 5_2
Submitted: 2009-02-16 10:33 UTC Modified: 2009-02-24 01:00 UTC
From: colder@php.net Assigned:
Status: No Feedback Package: Documentation problem
PHP Version: 5.3.0beta1 OS:
Private report: No CVE-ID: None
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 [2009-02-16 10:33 UTC] colder@php.net
Description:
------------
Depending on the context and the callback, call_user_func didn't propagate $this in 5_2. It now does in 5_3. Not sure which one is more correct, but there is definitely a potential BC break here.

Reproduce code:
---------------
<?php
class A {
    public function test() {
        B::foo();
        call_user_func(array("B", "foo"));
    }

}

class B extends A {
    public function foo() {
        var_dump($this);
    }
}

$b = new B; $b->test();

?>

Expected result:
----------------
// 5_2's output
object(B)#1 (0) {
}
NULL

Actual result:
--------------
// 5_3's output
object(B)#1 (0) {
}
object(B)#1 (0) {
}

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History

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 [2009-02-16 16:25 UTC] dmitry@php.net
This is not a bug, but just an illustration of is_callable/call_user_func mess which was fixed in 5.3 comparing to 5.2. The following extended example illustrates inconsistent behaviour of 5.2. Using call_user_func() it passes $this in one case and not in the other, however direct call passes %this in both cases.

<?php
class A {
    public function test() {
        B::foo();
        call_user_func(array("B","foo"));
    }
    public function bar() {
        var_dump($this);
    }
}

class B extends A {
    public function foo() {
        var_dump($this);
    }
    public function test2() {
        A::bar();
        call_user_func(array("A","bar"));
    }
}

$b = new B; $b->test(); $b->test2();
?>

PHP-5.2
-------
object(B)#1 (0) {
}
NULL
object(B)#1 (0) {
}
object(B)#1 (0) {
}

PHP-5.3
-------
object(B)#1 (0) {
}
object(B)#1 (0) {
}
object(B)#1 (0) {
}
object(B)#1 (0) {
}

 [2009-02-16 22:35 UTC] colder@php.net
Ok then, if this is intended, it should probably get mentionned in 5_2->5_3 migration guide, I just added it to the scratchpad and reclassify as documentation problem so it's not forgotten.
 [2009-02-24 01:00 UTC] doc-bugs at lists dot php dot net
No feedback was provided for this bug for over a week, so it is
being suspended automatically. If you are able to provide the
information that was originally requested, please do so and change
the status of the bug back to "Open".
 
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