Merging Arrays into one Array and populate keys with same values

Question

I need to merge Arrays into one Array and replace $key with $values of the same array.

My Array looks like this:

Array 
( 
  [0] => Array 
  ( 
  [city] => Berlin 
  ) 
  [1] => Array 
  ( 
  [city] => London
  ) 
  [2] => Array 
  ( 
  [city] => New York 
  )
  [3] => Array 
  ( 
  [city] => Vienna
  )
)

Desired result

Array 
( 
  [Berlin] => Berlin 
  [London] => London
  [New York] => New York 
  [Vienna] => Vienna
)

updates: source looks like this:

$a = json_decode('[{"city":"Berlin"},{"city":"London"},{"city":"New York"}, {"city":"Vienna"}]', true);```

Yes, Iam, i try with call_user_func_array , array_walk_recursive, array_column... — Dragan Petrovic FSD
– Dragan Petrovic FSD, Commented Oct 13, 2021 at 9:24

u_mulder · Accepted Answer · 2021-10-13 09:31:23Z

1

Oneliner is:

$newArray = array_column($yourArray, 'city', 'city');

Fiddle here.

answered Oct 13, 2021 at 9:31

u_mulder

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Alaister · Accepted Answer · 2021-10-13 09:24:38Z

0

$a = [['city' => 'Berlin'], ['city' => 'London']];
$b = [];

foreach ($a as $arr) $b[$arr['city']] = $arr['city'];

print_r($b);

Result:

Array ( [Berlin] => Berlin [London] => London )

answered Oct 13, 2021 at 9:24

Alaister

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6 Comments

Dragan Petrovic FSD Over a year ago

this is on of the source how i got it, source is JSON and i if use json_decode this not works: [ { "value": "0 800 nnn nnnn" }, { "value": "00 800-nnnnnnnn" }, { "value": "National (720)" }, { "value": "Vienna" } ]

Alaister Over a year ago

you can $array = json_decode($json, true); to convert it into array. the true is required.

Dragan Petrovic FSD Over a year ago

[link]3v4l.org/oEBL9#v7.4.24

Dragan Petrovic FSD Over a year ago

and second option 3v4l.org/daJsf

Alaister Over a year ago

missing }after {"city":"New York"

|

Alberto · Accepted Answer · 2021-10-13 09:32:29Z

0

You can use array_column :

$res = array_column($array, 'city');

this will give you your result, but as key you will have integer values, to get the city also as key, check @u_mulder answer

edited Oct 13, 2021 at 9:32

answered Oct 13, 2021 at 9:17

Alberto

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2 Comments

u_mulder Over a year ago

It will be just [Berlin. London ...] with numeric keys. Probably array_column($array, 'city', 'city'); might do the job.

Alberto Over a year ago

@u_mulder you are absolutely right

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