php.net |  support |  documentation |  report a bug |  advanced search |  search howto |  statistics |  random bug |  login

go to bug id or search bugs for

Bug #70593 Logic behind debug_backtrace options
Submitted: 2015-09-27 13:01 UTC Modified: 2015-09-27 13:50 UTC
From: david at davidsteinsland dot net Assigned:
Status: Not a bug Package: Unknown/Other Function
PHP Version: 5.6.13 OS: OSX
Private report: No CVE-ID: None
View Developer Edit
Welcome back! If you're the original bug submitter, here's where you can edit the bug or add additional notes.
If you forgot your password, you can retrieve your password here.
Password:
Status:
Package:
Bug Type:
Summary:
From: david at davidsteinsland dot net
New email:
PHP Version: OS:

 

 [2015-09-27 13:01 UTC] david at davidsteinsland dot net 
Description:
------------
What is the logic behind the options in debug_backtrace? As far as I can see, there is no way of getting only "args", and no "object" in the return value.

Option                                                              object      args
~DEBUG_BACKTRACE_PROVIDE_OBJECT | ~DEBUG_BACKTRACE_IGNORE_ARGS          1       0
DEBUG_BACKTRACE_PROVIDE_OBJECT  | DEBUG_BACKTRACE_IGNORE_ARGS           1       0
DEBUG_BACKTRACE_IGNORE_ARGS                                             0       0
~DEBUG_BACKTRACE_PROVIDE_OBJECT | DEBUG_BACKTRACE_IGNORE_ARGS           0       0
~DEBUG_BACKTRACE_PROVIDE_OBJECT                                         0       0
DEBUG_BACKTRACE_PROVIDE_OBJECT  | ~DEBUG_BACKTRACE_IGNORE_ARGS          1       1
DEBUG_BACKTRACE_PROVIDE_OBJECT                                          1       1
~DEBUG_BACKTRACE_IGNORE_ARGS                                            1       1

With these two constants, there is only possible to:
- get object only
- get nothing
- get object and args

Patches

Pull Requests

History

AllCommentsChangesGit/SVN commitsRelated reports
 [2015-09-27 13:50 UTC] requinix@php.net
-Status: Open +Status: Not a bug
 [2015-09-27 13:50 UTC] requinix@php.net 
PROVIDE_OBJECT is an opt-in flag: set this flag and you will get the object.
IGNORE_ARGS is an opt-out flag: set this flag and you will not get args.
If you do not want to opt-into getting the object do not want to opt-out of not getting the args then pass 0.

https://3v4l.org/qj87i

If you absolutely must use the flags then the correct bitmask is
  ~(DEBUG_BACKTRACE_PROVIDE_OBJECT | DEBUG_BACKTRACE_IGNORE_ARGS)
ie. negate the combination of both options. Or without the parentheses,
  ~DEBUG_BACKTRACE_PROVIDE_OBJECT & ~DEBUG_BACKTRACE_IGNORE_ARGS
 
PHP Copyright © 2001-2025 The PHP Group
All rights reserved. 		Last updated: Fri Oct 24 02:00:01 2025 UTC