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Doc Bug #14992 Behaviour of $array = $array1 + $array2; not documented
Submitted: 2002-01-11 05:04 UTC Modified: 2002-07-01 17:58 UTC
From: mfischer@php.net Assigned:
Status: Closed Package: Documentation problem
PHP Version: 4.1.1 OS:
Private report: No CVE-ID: None
View Developer Edit
 [2002-01-11 05:04 UTC] mfischer@php.net 
The behaviour of the following code doens't seem to be documented:

<?
    $foo = array(27 => 'Ene');
    $bar = array(-1 => 'Mene');
    
    $baz = $foo + $bar;

    var_dump($baz);
?>

array(2) {
  [27]=>
  string(3) "Ene"
  [-1]=>
  string(4) "Mene"
}

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 [2002-01-11 06:03 UTC] philip@php.net 
Where should this feature be documented, I see two viable options:

a) Under array_merge()
b) A new "Array Operators" man page. 

I assume most people wanting to merge arrays will go to array_merge() but having it's own man page could make room to clearly explain the differences of it and array_merge and array_merge_recursive.  I vote for (b).  Of course the functions would link to it.  This is kinda like how `backticks` are documented now, as, "Execution Operators".

A brief note under "Arithmetic Operators" may be appropriate too.

Also, for those interested in documenting this beast, please see this post:

http://marc.theaimsgroup.com/?l=phpdoc&m=101074306518514
 [2002-01-16 12:53 UTC] andrei@php.net 
$array1 + $array2 is *not* the same as array_merge(). See for yourself with array(1, 2) and array(5, 6, 7).
 [2002-01-16 14:44 UTC] philip@php.net 
We know, but it needs to be documented nevertheless.  I posted a rather detailed test.  The question is "where" to document it exactly.
 [2002-06-29 13:03 UTC] steph dot fox at btinternet dot com 
This is actually documented under array_merge() (was it always? - dunno) but omits to mention that shared keys will be overwritten on a first-come first-served basis.  Quick update, anyone with access?
 [2002-07-01 17:58 UTC] jan@php.net 
This bug has been fixed in CVS. You can grab a snapshot of the
CVS version at http://snaps.php.net/. In case this was a documentation 
problem, the fix will show up soon at http://www.php.net/manual/.
In case this was a PHP.net website problem, the change will show
up on the PHP.net site and on the mirror sites.
Thank you for the report, and for helping us make PHP better.
 [2020-02-07 06:12 UTC] phpdocbot@php.net 
Automatic comment on behalf of jan
Revision: http://git.php.net/?p=doc/en.git;a=commit;h=8cbc437a8e6cdc98ff98b64653663d7e2277f287
Log: - fix #14992
 
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