Bug #54140 [Opn->Nab]: array_merge() break keys during merge
Edit report at https://bugs.php.net/bug.php?id=54140&edit=1
ID: 54140
Updated by: cmb@php.net
Reported by: forjest at gmail dot com
Summary: array_merge() break keys during merge
-Status: Open
+Status: Not a bug
Type: Bug
Package: Arrays related
Operating System: *Nix
PHP Version: 5.3.5
-Assigned To:
+Assigned To: cmb
Block user comment: N
Private report: N
New Comment:
This is not particularly related to array_merge(), but to the
handling of array keys in general. From the manual[1]:
| Strings containing valid integers will be cast to the integer
| type.
So
var_dump(array('10'=>11, '11'=>23));
outputs:
array(2) {
[10] =>
int(11)
[11] =>
int(23)
}
and not:
array(2) {
'10' =>
int(11)
'11' =>
int(23)
}
The rest is documented on the array_merge() man page:
| Values in the input array with numeric keys will be renumbered
| with incrementing keys starting from zero in the result array.
[1] <http://php.net/manual/en/language.types.array.php>
Previous Comments:
------------------------------------------------------------------------
[2012-01-04 17:03:50] siedler1 at freenet dot de
I have php version 5.3.6 on Ubuntu and this behavior still exist.
------------------------------------------------------------------------
[2011-04-20 17:09:29] martin at fleveo dot cz
This bug is on Windows 7 too (same version of PHP).
------------------------------------------------------------------------
[2011-03-09 19:27:38] cybd at bigmir dot net
Maybe, simpler example.
OK:
$c = array('01'=>3, '03'=>10);
$d = array('05'=>44, '07'=>3);
var_dump(array_merge($c,$d));
Failed:
$a = array('01'=>1, '02'=>73);
$b = array('10'=>11, '11'=>23);
var_dump(array_merge($a,$b));
------------------------------------------------------------------------
[2011-03-02 19:03:46] forjest at gmail dot com
Works as expected on Windows platform.
------------------------------------------------------------------------
[2011-03-02 18:21:06] forjest at gmail dot com
Description:
------------
array_merge interprets string keys, containing only digits as numeric keys, if numeric overflow not
reached.
String keys should works as strings regarless of their contents.
Test script:
---------------
var_dump(array_merge(array('t777'=> array("I'm a string"))));
var_dump(array_merge(array("42424242"=> array("I'm a string of
digits"))));
var_dump(array_merge(array("777777777777777777777777777777777777777777777777777777777"=>
array("I'm string of digits too"))));
var_dump(is_string("42424242"));
var_dump(is_string(42424242));
var_dump(is_string("777777777777777777777777777777777777777777777777777777777"));
Expected result:
----------------
array(1) {
["t777"]=>
array(1) {
[0]=>
string(12) "I'm a string"
}
}
array(1) {
["42424242"]=>
array(1) {
[0]=>
string(22) "I'm a string of digits"
}
}
array(1) {
["777777777777777777777777777777777777777777777777777777777"]=>
array(1) {
[0]=>
string(24) "I'm string of digits too"
}
}
bool(true)
bool(false)
bool(true)
Actual result:
--------------
array(1) {
["t777"]=>
array(1) {
[0]=>
string(12) "I'm a string"
}
}
array(1) {
[0]=>
array(1) {
[0]=>
string(22) "I'm a string of digits"
}
}
array(1) {
["777777777777777777777777777777777777777777777777777777777"]=>
array(1) {
[0]=>
string(24) "I'm string of digits too"
}
}
bool(true)
bool(false)
bool(true)
------------------------------------------------------------------------
--
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