Bug #64239 [Asn]: Debug backtrace changed behavior since 5.4.10 or 5.4.11

From: Date: Tue, 19 Feb 2013 08:43:01 +0000
Subject: Bug #64239 [Asn]: Debug backtrace changed behavior since 5.4.10 or 5.4.11
References: 1  Groups: php.bugs 
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Edit report at https://bugs.php.net/bug.php?id=64239&edit=1

 ID:                 64239
 Updated by:         laruence@php.net
 Reported by:        kusmierz at o2 dot pl
 Summary:            Debug backtrace changed behavior since 5.4.10 or
                     5.4.11
 Status:             Assigned
 Type:               Bug
 Package:            *General Issues
 Operating System:   Ubuntu,Debian,Windows
 PHP Version:        5.4.11
 Assigned To:        dmitry
 Block user comment: N
 Private report:     N

 New Comment:

yes, that alias name gave us too many pains :)...

add a new alias_name is a easy and clear way. 

thanks


Previous Comments:
------------------------------------------------------------------------
[2013-02-19 07:11:45] dmitry@php.net

Laruence, you are right. Reflection, debug_backtrace() and get_class_methods() are affected.

It would be good to fix it, however, I don't see a good way to do it, and I don't like to
introduce a new hack. (e.g. resolving alias name by looking into hash table key).

Actually we have the same situation with class aliases.

In general, we can fix it in 5.5 using some inefficient way (e.g. add
op_array->alias_function_name)

Any ideas are welcome.

------------------------------------------------------------------------
[2013-02-19 04:14:26] laruence@php.net

seems due to the new implemention of trait, not only debug_backtrace, I think the 
reflection is also affected.

dmitry, do you think this should be fixed?

thanks

------------------------------------------------------------------------
[2013-02-18 20:48:20] kusmierz at o2 dot pl

Description:
------------
The debug_backtrace behavior has been changed since 5.4.9. Previously first method 
in backtrace array was an alias name (Bmethod in my example) which seems to be ok 
as only one possibility to check name of trait's aliased method name (see also 
#61033). Now it returns trait's method name (t2method), which is incorrect in my 
mind - I can't now check which method was originally called.

Test script:
---------------
class A {
	use T1;
	public function test() { $this->backtrace(); }
}
class B {
	use T2 { t2method as Bmethod; }
}
trait T1 {
	protected function backtrace() {
		$b = new B();
		$b->Bmethod();
	}
}
trait T2 {
	public function t2method() {
		var_dump(debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 1));
	}
}
$a = new A(); $a->test();

Expected result:
----------------
// php 5.4.9
array(1) {
  [0]=>
  array(5) {
    ["file"]=>
    string(24) "/home/adam/test/test.php"
    ["line"]=>
    int(25)
    ["function"]=>
    string(7) "Bmethod" // OK;
    ["class"]=>
    string(1) "B"
    ["type"]=>
    string(2) "->"
  }
}

Actual result:
--------------
// php 5.4.11
array(1) {
  [0] =>
  array(5) {
    'file' =>
    string(19) "/home/adam/test.php"
    'line' =>
    int(25)
    'function' =>
    string(8) "t2method" // !
    'class' =>
    string(1) "B"
    'type' =>
    string(2) "->"
  }
}



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



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