Transpose an indexed array of associative arrays [duplicate]

Question

I have an array of date like this

Array ( [0] => Array ( [imageName] => WNgrRdqZ [alt] => alt text ) [1] => Array ( [imageName] => xoPS0udB [alt] => Alt ) )

And I'm wanted to format it so I get one array of imageNames, and one array of alt. I can do this simply with a foreach loop, but I'm curious if there's a build in PHP function I could use instead of rewriting something else. I've not found anything useful yet in the PHP manual.

EDIT: It could also be split into 1 array with 2 sub arrays, e.g.

Array ( ['imageName'] => Array(..), ['alt'] => Array(...) )

How did I miss that! Thank you :). If you post that as an answer I'll accept it for you. — TMH
– TMH, Commented Jul 9, 2014 at 10:16

fdehanne · Accepted Answer · 2014-07-09 10:21:19Z

3

You can use array_column():

$imageName = array_column($Array, 'imageName'); $alt = array_column($Array, 'alt');

edited Jul 9, 2014 at 10:21

fdehanne

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answered Jul 9, 2014 at 10:17

Sudec

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3 Comments

Karthick Kumar Over a year ago

he want the output array like this Array ( [imagename] => Array ( [0] => WNgrRdqZ [1] => xoPS0udB ) [alt] => Array ( [0] => alt text [1] => Alt ) )

Sudec Over a year ago

I see no problem there. Just put the 2 resulting arrays into one after splitting the collumns

Karthick Kumar Over a year ago

array_column is not supported in early version of php

Marecky · Accepted Answer · 2014-07-09 10:22:28Z

You can use array_reduce:

<?php $data = array ( array ( 'imageName' => 'WNgrRdqZ', 'alt' => 'alt text' ), array ( 'imageName' => 'xoPS0udB', 'alt' => 'Alt' ) ); $reduced = array_reduce($data,function($carry, $item){ $carry['imageName'][] = $item['imageName']; $carry['alt'][] = $item['alt']; return $carry; },array()); print_r($reduced);

Working example https://ideone.com/48JXvL

Karthick Kumar · Accepted Answer · 2014-07-09 10:24:21Z

please review this code

<?php $arraystest = array(0 => array('imageName' => 'WNgrRdqZ', 'alt' => 'alt text'), 1 => array('imageName' => 'xoPS0udB', 'alt' => 'Alt')); $i = 0; $newarray = array(); foreach ($arraystest as $item) { $newarray['imagename'][$i] = $item['imageName']; $newarray['alt'][$i] = $item['alt']; $i++; } print_r($newarray); exit; ?>

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