PHP: Get result from arrays.

Question

Sorry for the title. its little difficult for me to explain. I've spent almost few hours to figure this out, but failed. So I'm posting it here.

I have following array

Array
(
    [0] => Array
        (
            [0] => a
            [1] => b
            [2] => c
        )

    [1] => Array
        (
            [0] => p
            [1] => q
            [2] => r
        )

    [2] => Array
        (
            [0] => w
            [1] => x
            [2] => y
            [3] => z
        )

)

The array could have any number of elements.

What i need to do is create another array based on above array.

Array
(
    [0] => Array
        (
            [0] => a
            [1] => p
            [2] => w
        )

    [1] => Array
        (
            [0] => b
            [1] => q
            [2] => x
        )

    [2] => Array
        (
            [0] => c
            [1] => r
            [2] => y
        )

    [3] => Array
        (
            [0] => Z
        )

)

Any hints will be appreciated.

Thanks

Take a look here. The only difference is that each of your args is just an element of the first array: http://stackoverflow.com/questions/2815162/is-there-a-php-function-like-pythons-zip — Rohan Prabhu, Apr 15 '14 at 09:56
from where I see it 2 nested loops could do the trick. If you could show us some code produced during the almost few hours you tried, that may help us finding where you're exactly struggling. — Laurent S., Apr 15 '14 at 09:56

score 3 · Answer 1 · answered Apr 15 '14 at 09:54

3

Upgrade to PHP 5.5 if you aren't already on it, then use array_column

answered Apr 15 '14 at 09:54

Niet the Dark Absol

320,036
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1

Can you tell me what he wants to do? – Xatenev Apr 15 '14 at 09:55
3

Looks like he needs array of arrays where each "sub-array" holds the elements that have same index in source array. – dkasipovic Apr 15 '14 at 09:56
Up gradation is really a solution? – Dushyant Joshi Apr 15 '14 at 09:58
Exactly what @DKasipovic said. OP is trying to get the columns of the array. – Niet the Dark Absol Apr 15 '14 at 09:58
3

@DushyantJoshi ***YES!*** You should *always* run the latest (stable) versions of things, if for nothing else than for the security fixes, but mostly for all the new features and improvements! – Niet the Dark Absol Apr 15 '14 at 09:58
@DKasipovic Me too. Apparently, this is too simple, it cannot possibly be the right answer... – Niet the Dark Absol Apr 15 '14 at 09:59

Alex · Accepted Answer · 2014-04-15T10:03:00.460

3

If PHP < 5.5 or you don't want to use array_column-solution

$newArray = array();

foreach($array as $row)
     foreach($row as $key => $value){
         if (!isset($newArray[$key]))
             $newArray[$key] = array();
         $newArray[$key][] = $value;
     }

edited Apr 15 '14 at 10:03

answered Apr 15 '14 at 09:56

Alex

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score 2 · Answer 3 · answered Apr 15 '14 at 09:58

Just try with array_walk_recursive:

$input  = [
    ['a', 'b', 'c'],
    ['p', 'q', 'r'],
    ['w', 'x', 'y', 'z'],
];
$output = [];


array_walk_recursive($input, function($value, $index) use (&$output) {
    if (!isset($output[$index])) {
        $output[$index] = [];
    }

    $output[$index][] = $value;
});

Output:

array (size=4)
  0 => 
    array (size=3)
      0 => string 'a' (length=1)
      1 => string 'p' (length=1)
      2 => string 'w' (length=1)
  1 => 
    array (size=3)
      0 => string 'b' (length=1)
      1 => string 'q' (length=1)
      2 => string 'x' (length=1)
  2 => 
    array (size=3)
      0 => string 'c' (length=1)
      1 => string 'r' (length=1)
      2 => string 'y' (length=1)
  3 => 
    array (size=1)
      0 => string 'z' (length=1)

The whole condition block can be safely removed. https://3v4l.org/GTjk1 — mickmackusa, Jul 28 '22 at 14:55

PHP: Get result from arrays.

3 Answers3