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Bug #63025 Method in trait not called when called as __constructor() argument
Submitted: 2012-09-07 05:20 UTC Modified: 2012-09-09 09:02 UTC
From: hinikato at mail dot ru Assigned: laruence (profile)
Status: Closed Package: Documentation problem
PHP Version: 5.4.6 OS: Windows 7 x64
Private report: No CVE-ID: None
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 [2012-09-07 05:20 UTC] hinikato at mail dot ru 
Description:
------------
Please see the code below.

If I try move the $this->getSomething() to var:

$tmp = $this->getSomething();
return new Bar($tmp);

it works as expected, however it does not work as shown below.

Test script:
---------------
class Foo {
    use TFoo;
    
    function test() {
        $this->getFromTrait();
    }
}

class Bar {
  function some() {
    die(__METHOD__);
  }
}

trait TFoo {
  function getFromTrait() {
    return new Bar($this->getSomething());
  }
  
  function getSomething() {
    // Must be called!!!
    die(__METHOD__);
  }
}

(new Foo())->test();


Expected result:
----------------
THe TFoo::getSomething() should be called.

Actual result:
--------------
The TFoo::getSomething()not called.

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 [2012-09-07 05:50 UTC] reeze dot xia at gmail dot com 
There is nothing to do with trait. look
http://3v4l.org/eOVRJ

class A {
    /* no constructor  public function __construct() {} */
}
class B {
    public function __construct() {
		die("DIE ME!");
    }
}

$a = new A(new B());
// output nothing. it didn't die with "DIE ME!"

since class A didn't have any constructor, so the construct params will not 
executed the same as:

if (false && $it->iWillNotBeExecuted()) {
  //
}

I thought this is a document problem :)
 [2012-09-07 07:04 UTC] hinikato at mail dot ru 
@reeze.xia, yes, this weird behavior, because we can do somethink like this:
function __construct() {
   $args = func_get_args();
   // do something with $args
}

It seems like a bug.
 [2012-09-07 07:14 UTC] reeze dot xia at gmail dot com 
hi hinikato, 
 Yes, as previous email, if constructor was defined it will get called
so your func_get_args() test script works :)
.
if not it will not get called, so the params expression will not executed.

new operator is not the same as normal function call. so it behavior 
differently,
 [2012-09-07 08:41 UTC] laruence@php.net 
construct is a fcall after ZEND_NEW opcode, if there is construct, then no fcall 
at all(thus no argument substituation).

<?php
class Foo {
}

function a() {
    die("DIE ME!");
}

$b = new Foo(a());
?>

I'd like to mark this as a DOC bug, since agrumets eval is useless in most of 
the times.
 [2012-09-07 08:41 UTC] laruence@php.net
-Package: Scripting Engine problem +Package: Documentation problem
 [2012-09-07 08:42 UTC] laruence@php.net 
s #if there is construct,#if there is no constructor,#
 [2012-09-08 15:38 UTC] reeze dot xia at gmail dot com 
I found a same bug reported before:
https://bugs.php.net/bug.php?id=54162

we could mark one of them as duplicated
 [2012-09-09 06:14 UTC] hinikato at mail dot ru 
@reeze.xia, ok, fine ;) I agree, that the #54162 issue can be marked as duplicated, this issue contains more information.
 [2012-09-09 09:02 UTC] laruence@php.net 
as felipe closed a similar one #54162. then I think this could also be closed

see: http://news.php.net/php.bugs/173260
 [2012-09-09 09:02 UTC] laruence@php.net
-Status: Open +Status: Closed -Assigned To: +Assigned To: laruence
 
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