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From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Newsgroups: comp.lang.php
Subject: Re: how to join two arrays?
Date: Sun, 04 May 2014 21:47:08 +0200
Organization: PointedEars Software (PES)
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Jerry Stuckle wrote:

> On 5/4/2014 1:56 PM, Thomas 'PointedEars' Lahn wrote:
>> Denis McMahon wrote:
>>> then: array_merge ( $arr1, $arr2 );
>>>
>>> will generate:
>>>
>>> [0] "."
>>> [1] ".."
>>> [2] "foo.bar"
>>> [3] "really fubar"
>>> [4] "."
>>> [5] ".."
>>> [6] "bah bah.blacksheep"
>>> [7] "fufu.fubar"
>>>
>>> How you then tell which file is where, that's your headache at this
>>> point.
>>
>> array_map() serves here.
> 
> And how can array_map() tell which file is where?

It cannot.  However, if you apply array_map() to the arrays returned by 
scandir() before merging them, the problem at hand does not occur in the 
first place:

$modi = max(
  array_map('filemtime',
    array_diff(
      array_merge(
        scandir(__DIR__),
        array_map(
          function ($e) {
            return 'sections' . DIRECTORY_SEPARATOR . $e;
          },
          scandir('sections')
        )
      ),
      array('.', '..')
    )
  )
);


HTH

PointedEars
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