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: stackoverflow.com/questions/2815162/… — Rohan Prabhu
– Rohan Prabhu, Commented Apr 15, 2014 at 9:56
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.
– Laurent S., Commented Apr 15, 2014 at 9:56

Alex · Accepted Answer · 2014-04-15 10:03:00Z

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, 2014 at 10:03

answered Apr 15, 2014 at 9:56

Alex

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Comments

Niet the Dark Absol · Accepted Answer · 2014-04-15 09:54:04Z

3

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

answered Apr 15, 2014 at 9:54

Niet the Dark Absol

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6 Comments

xate Over a year ago

Can you tell me what he wants to do?

dkasipovic Over a year ago

Looks like he needs array of arrays where each "sub-array" holds the elements that have same index in source array.

Dushyant Joshi Over a year ago

Up gradation is really a solution?

Niet the Dark Absol Over a year ago

Exactly what @DKasipovic said. OP is trying to get the columns of the array.

Niet the Dark Absol Over a year ago

@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!

|

hsz · Accepted Answer · 2014-04-15 09:58:18Z

2

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)

answered Apr 15, 2014 at 9:58

hsz

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1 Comment

mickmackusa Over a year ago

The whole condition block can be safely removed. 3v4l.org/GTjk1

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