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Doc Bug #62706 array_map documentation is missing info about "use" keyword
Submitted: 2012-07-31 17:51 UTC Modified: 2012-07-31 20:26 UTC
Votes:1
Avg. Score:5.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:1 (100.0%)
Same OS:1 (100.0%)
From: lists at box dot cz Assigned:
Status: Wont fix Package: Documentation problem
PHP Version: Irrelevant OS: irrelevant
Private report: No CVE-ID: None
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 [2012-07-31 17:51 UTC] lists at box dot cz 
Description:
------------
---
From manual page: http://www.php.net/function.array-map#refsect1-function.array-map-examples
---
When first looking at array_map() I thought it's a fantastically useless function (compared to other languages, Ruby being notable example).

The reason was perceived inability to access parent scope.

Only when discussing the matter with a more skilled PHP dev I was told there is a way to access parent scope.

Therefore the documentation should include mention of the construct:

<?php
$vars = array('a' => 'one', 'b' => 'two', 'c' => 'three');
$a = array('a', 'b', 'c');
$f = function($x) use ($vars) { return $vars[$x]; };
print_r(array_map($f, $a));
?>

to make it abundantly clear it is, indeed, possible.

Expected result:
----------------
To find the info in that docs section.

Actual result:
--------------
No mention of "use" within official text.

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 [2012-07-31 19:14 UTC] salathe@php.net 
Documenting the details of wrapping variables within closures, or indeed 
mentioning it in passing, does not belong on the array_map() page. That is what 
the dedicated anonymous functions / closures page [1] is for.

[1] http://php.net/manual/en/functions.anonymous.php
 [2012-07-31 19:14 UTC] salathe@php.net
-Status: Open +Status: Wont fix
 [2012-07-31 20:26 UTC] lists at box dot cz 
I respectfully disagree, even if it doesn't get me anywhere.

The example #2 present on that page documents exactly the thing that "doesn't belong on the array_map() page".

Trouble is, example #2 is idiotic (half-assed multiply-by-two function) and a link to anonymous function (eh, "closures") documentation is nowhere to be found on the array_map() page.

To me that's confusing because I'd have to know about "functions.anonymous.php" to be able to find the whole truth.

Why not make it:
1) easier for people to find docs for anon functions;
2) clear that there's more to array_map() [as of 5.3.X].

By that I mean -- changing Ex#2 to something more meaningful *and* adding link to functions.anonymous.php.
 
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