From: Ultrasick at gmx dot de
Operating system: probably any
PHP version: 5.2.6
PHP Bug Type: Scripting Engine problem
Bug description: array_walk ignores to pass reference if & is in function
definition at userdata
Description:
------------
The function "array_walk" ignores to pass the reference and passes the
content instead for the parameter "userdata" if the "&" isn't written
inside the "array_walk()" but inside the function definition ("function
somename(&$value, &$key, &$userdata)"). This doesn't work for the
"userdata"-parameter but it does work for the "value" and the
"key"-parameter.
Have a look at the code at the bottom and the expected and the actual
result. Now compare what would happen if you would call "my_function"
manually by using
my_function($any_value, $any_key, $my_variable);
echo $my_variable;
and then using
my_function($any_value, $any_key, &$my_variable);
echo $my_variable;
In both cases $my_variable would be increased, of course.
So in my oppinion the userdata-problem it's not just inconsistency. It's a
bug because a part of the function definition is beeing ignored.
Reproduce code:
---------------
<?
function my_function(&$value, &$key, &$userdata){
$userdata++;
}
$my_array = array('one', 'two', 'three');
$my_variable = 1;
array_walk($my_array, 'my_function', $my_variable);
echo $my_variable;
echo '<p><hr></p>';
array_walk($my_array, 'my_function', &$my_variable);
echo $my_variable;
?>
Expected result:
----------------
expected output:
4
-----------
4
Actual result:
--------------
actual output:
1
-----------
4
--
Edit bug report at http://bugs.php.net/?id=45780&edit=1
--
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=45780&r=trysnapshot52
Try a CVS snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=45780&r=trysnapshot53
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=45780&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=45780&r=fixedcvs
Fixed in release:
http://bugs.php.net/fix.php?id=45780&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=45780&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=45780&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=45780&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=45780&r=support
Expected behavior: http://bugs.php.net/fix.php?id=45780&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=45780&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=45780&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=45780&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=45780&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=45780&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=45780&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=45780&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=45780&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=45780&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=45780&r=mysqlcfg
