From:
Operating system:
PHP version: Irrelevant
Package: Scripting Engine problem
Bug Type: Feature/Change Request
Bug description:Assigning to list(); list() as an lvalue
Description:
------------
When an array is "assigned" to a list($of,$variables), the elements of the
array are extracted and assigned to the listed variables; elements can be
skipped by duplicating commas in the list().
The variables in the list() construct may themselves be list() constructs,
allowing the extraction of values from nested arrays (the nesting of the
list()s reflects the nesting of the arrays).
On the PHP6 TODO list is the job of allowing list() to appear as the
iterated value in a foreach statement (foreach($array as
$key=>list($v1,$v2)){...}).
My suggestion is that another place where list() might play a role is in
function declarations; when a function parameter is in a list(), the
argument it gets when it's called has its elements extracted and assigned
to the variables in the list (see the test script for this to be clearer).
If the argument is not an array, the behaviour would be the same in
existing situations where list() is not given an array. References would
behave as usual also.
Test script:
---------------
<?php
function foo($a, list($b, &$c), $d)
{
echo "$a $c $b $d";
$c = 'Zero';
}
$coconuts = array('One', 'Two', 'Three', 'Four');
foo(17, $coconuts, "radish");
echo "\n", $coconuts[1];
?>
Expected result:
----------------
17 Two One radish
Zero
Actual result:
--------------
At present it's a parse error, of course.
--
Edit bug report at http://bugs.php.net/bug.php?id=51876&edit=1
--
Try a snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=51876&r=trysnapshot52
Try a snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=51876&r=trysnapshot53
Try a snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=51876&r=trysnapshot60
Fixed in SVN:
http://bugs.php.net/fix.php?id=51876&r=fixed
Fixed in SVN and need be documented:
http://bugs.php.net/fix.php?id=51876&r=needdocs
Fixed in release:
http://bugs.php.net/fix.php?id=51876&r=alreadyfixed
Need backtrace:
http://bugs.php.net/fix.php?id=51876&r=needtrace
Need Reproduce Script:
http://bugs.php.net/fix.php?id=51876&r=needscript
Try newer version:
http://bugs.php.net/fix.php?id=51876&r=oldversion
Not developer issue:
http://bugs.php.net/fix.php?id=51876&r=support
Expected behavior:
http://bugs.php.net/fix.php?id=51876&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=51876&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=51876&r=submittedtwice
register_globals:
http://bugs.php.net/fix.php?id=51876&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=51876&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=51876&r=dst
IIS Stability:
http://bugs.php.net/fix.php?id=51876&r=isapi
Install GNU Sed:
http://bugs.php.net/fix.php?id=51876&r=gnused
Floating point limitations:
http://bugs.php.net/fix.php?id=51876&r=float
No Zend Extensions:
http://bugs.php.net/fix.php?id=51876&r=nozend
MySQL Configuration Error:
http://bugs.php.net/fix.php?id=51876&r=mysqlcfg
