From: k at phpkoala dot com
Operating system: Linux
PHP version: 5.1.2
PHP Bug Type: Scripting Engine problem
Bug description: debug_backtrace information has mixed scope
Description:
------------
When I call debug_backtrace, I find that the results do not match
expectations. Specifically, the line number does not match the values for
function and class.
As shown below, I would expect to see the line number match the values for
function and class, at the point referenced. If this point is deemed to be
the point where debug_backtrace is called from, then I would expect the
details to show the function and class in scope at the line number that
debug_backtrace was called, and then as the next most recent entry, the
line number etc. for the code that called the function containing the
debug_backtrace command.
Otherwise, if the reported details should ignore the point in the code
that calls debug_backtrace (the current scope at that point) then that
entry should not be reported, and the function and class should be
relative to the line number that called the function.
It would appear that the second of these two options is intended, but that
the function and class are being reported for the scope "now" (when
debug_backtrace is called) rather than "then" (the last call, i.e. the
call to the function) which is what the line number reports.
To further clarify; I would expect the output to match the details that
would be shown if I used __FILE__, __LINE__, __FUNCTION__, __CLASS__ at
each call point. Surely these should all match up...?
I am running dot-deb packages for PHP 5.1.2. No customisations.
This issue also occurs on PHP 4.3.10.
Reproduce code:
---------------
<?php
class test {
function check1() {
print_r(debug_backtrace());
}
function check2() {
self::check1(); // Line 8
}
}
echo "Test 1:\n\n";
test::check1(); // Line 13
echo "\n\nTest 2:\n\n";
test::check2(); // Line 16
Expected result:
----------------
Test 1:
Array
(
[0] => Array
(
[file] => /home/test.php
[line] => 13
[function] =>
[class] =>
[type] =>
[args] =>
)
)
Test 2:
Array
(
[0] => Array
(
[file] => /home/test.php
[line] => 8
[function] => check2
[class] => test
[type] => ::
[args] => Array
(
)
)
[1] => Array
(
[file] => /home/test.php
[line] => 16
[function] =>
[class] =>
[type] =>
[args] =>
)
)
-------------------- OR --------------------
Test 1:
Array
(
[0] => Array
(
[file] => /home/test.php
[line] => 5
[function] => check1
[class] => test
[type] => ::
[args] => Array
(
)
)
[1] => Array
(
[file] => /home/test.php
[line] => 13
[function] =>
[class] =>
[type] =>
[args] =>
)
)
Test 2:
Array
(
[0] => Array
(
[file] => /home/test.php
[line] => 5
[function] => check1
[class] => test
[type] => ::
[args] => Array
(
)
)
[1] => Array
(
[file] => /home/test.php
[line] => 8
[function] => check2
[class] => test
[type] => ::
[args] => Array
(
)
)
[2] => Array
(
[file] => /home/test.php
[line] => 16
[function] =>
[class] =>
[type] =>
[args] =>
)
)
Actual result:
--------------
Test 1:
Array
(
[0] => Array
(
[file] => /home/test.php
[line] => 13
[function] => check1
[class] => test
[type] => ::
[args] => Array
(
)
)
)
Test 2:
Array
(
[0] => Array
(
[file] => /home/test.php
[line] => 8
[function] => check1
[class] => test
[type] => ::
[args] => Array
(
)
)
[1] => Array
(
[file] => /home/test.php
[line] => 16
[function] => check2
[class] => test
[type] => ::
[args] => Array
(
)
)
)
--
Edit bug report at http://bugs.php.net/?id=36883&edit=1
--
Try a CVS snapshot (PHP 4.4):
http://bugs.php.net/fix.php?id=36883&r=trysnapshot44
Try a CVS snapshot (PHP 5.1):
http://bugs.php.net/fix.php?id=36883&r=trysnapshot51
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=36883&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=36883&r=fixedcvs
Fixed in release:
http://bugs.php.net/fix.php?id=36883&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=36883&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=36883&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=36883&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=36883&r=support
Expected behavior: http://bugs.php.net/fix.php?id=36883&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=36883&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=36883&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=36883&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=36883&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=36883&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=36883&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=36883&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=36883&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=36883&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=36883&r=mysqlcfg
