Merge Array Function Problem :(

[rockey killer]

While I was coding , here is my code

$array1 = array(
'1' => 'one',
'2' => 'two',
'3' => 'three',
'4' => 'four'
);
$array2 = array();
foreach($array1 as $key => $v) {
$array2[$v] = $key;
};
$newarray = array_merge($array1,$array2);
foreach($newarray as $key => $v) {
echo $key." ".$v."\n";
};

Result that I got was

0 one
1 two
2 three
3 four
one 1
two 2
three 3
four 4

Now you can see the index and key have changed and now 0 is written in-
front of one , obviously I wasn't expecting that but i can hardly find
any solution for this . So I decided to write my own function for
merging two arrays.

Here is my function

function mergearray($array1,$array2) {
$array3 = array();
foreach($array1 as $key => $v) {
$array3[$key] = $v;
};
foreach($array2 as $key => $v) {
$array3[$key] = $v;
};
return $array3;
};

You can use it to merge 2 arrays :)
You can further discuss over it here ,

http://h4ck3r.in/board/showthread.php?tid=1595

["Álvaro G. Vicario"]

El 10/06/2010 6:43, rockey killer escribi�/wrote:
> While I was coding , here is my code
>
> $array1 = array(
> '1' => 'one',
> '2' => 'two',
> '3' => 'three',
> '4' => 'four'
> );
> $array2 = array();
> foreach($array1 as $key => $v) {
> $array2[$v] = $key;
> };

Or:

$array2 = array_flip($array1);

> $newarray = array_merge($array1,$array2);
> foreach($newarray as $key => $v) {
> echo $key." ".$v."\n";
> };
>
>
> Result that I got was
>
>
> 0 one
> 1 two
> 2 three
> 3 four
> one 1
> two 2
> three 3
> four 4
>
> Now you can see the index and key have changed and now 0 is written in-
> front of one , obviously I wasn't expecting that but i can hardly find
> any solution for this .

Try this instead:

$newarray = $array1 + $array2;

> So I decided to write my own function for
> merging two arrays.

Sooner or later, we all reimplement some built-in array function :)

>
> Here is my function
>
> function mergearray($array1,$array2) {
> $array3 = array();
> foreach($array1 as $key => $v) {
> $array3[$key] = $v;
> };
> foreach($array2 as $key => $v) {
> $array3[$key] = $v;
> };
> return $array3;
> };
>
> You can use it to merge 2 arrays :)
> You can further discuss over it here ,
>
> http://h4ck3r.in/board/showthread.php?tid=1595

--
-- http://alvaro.es - �lvaro G. Vicario - Burgos, Spain
-- Mi sitio sobre programaci�n web: http://borrame.com
-- Mi web de humor satinado: http://www.demogracia.com
--

[Thomas 'PointedEars' Lahn]

rockey killer wrote:

> While I was coding , here is my code
>
> $array1 = array(
> '1' => 'one',
> '2' => 'two',
> '3' => 'three',
> '4' => 'four'
> );
> $array2 = array();
> foreach($array1 as $key => $v) {
> $array2[$v] = $key;
> };
> $newarray = array_merge($array1,$array2);

You could have done easier and better with

$newarray = array_merge($array1, array_flip($array1));

> foreach($newarray as $key => $v) {
> echo $key." ".$v."\n";
> };

print_r($newarray);

is a bit easier.

> Result that I got was
>
> 0 one
> 1 two
> 2 three
> 3 four
> one 1
> two 2
> three 3
> four 4

As expected.

> Now you can see the index and key have changed and now 0 is written in-
> front of one , obviously I wasn't expecting that

You should have. The key of the first element of the flipped array must be
'0'.

> but i can hardly find any solution for this . So I decided to write my
> own function for merging two arrays.
>
> Here is my function
>
> function mergearray($array1,$array2) {
> $array3 = array();
> foreach($array1 as $key => $v) {
> $array3[$key] = $v;
> };
> foreach($array2 as $key => $v) {
> $array3[$key] = $v;
> };
> return $array3;
> };
>
> You can use it to merge 2 arrays :)

Or you could prepend the required number of elements to the flipped array
before merging, e.g.:

$a = array('1' => 'one', '2' => 'two');
$a2 = array_flip($a);
array_unshift($a2, '');
print_r(array_merge($a2, $a));

Generalizing this solution is left as an exercise to the reader.

> You can further discuss over it here ,
>

> http://h4ck3r.in/board/[...]

Forget it. Post here, read here.

PointedEars
--
Danny Goodman's books are out of date and teach practices that are
positively harmful for cross-browser scripting.
-- Richard Cornford, cljs, <cife6q$253$1$8300...@news.demon.co.uk> (2004)