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Request #51876 Assigning to list(); list() as an lvalue
Submitted: 2010-05-21 00:54 UTC Modified: 2011-01-01 00:01 UTC
Avg. Score:5.0 ± 0.0
Reproduced:0 of 0 (0.0%)
From: a at b dot c dot de Assigned:
Status: Not a bug Package: Scripting Engine problem
PHP Version: Irrelevant OS:
Private report: No CVE-ID: None
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 [2010-05-21 00:54 UTC] a at b dot c dot de
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:

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

Actual result:
At present it's a parse error, of course.


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 [2011-01-01 00:01 UTC]
-Status: Open +Status: Bogus
 [2011-01-01 00:01 UTC]
Please do not submit the same bug more than once. An existing
bug report already describes this very problem. Even if you feel
that your issue is somewhat different, the resolution is likely
to be the same. 

Thank you for your interest in PHP.

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