convert array with objects to one associative array without foreach

Question

I have an array like(result of json_decode):

array(2) {
  [0]=>
  object(stdClass)#1 (3) {
    ["key"]=>
    string(6) "sample"
    ["startYear"]=>
    string(4) "2000"
    ["endYear"]=>
    string(4) "2015"
  }
  [1]=>
  object(stdClass)#2 (3) {
    ["key"]=>
    string(13) "second_sample"
    ["startYear"]=>
    string(4) "1986"
    ["endYear"]=>
    string(4) "1991"
  }
}

I want to convert it to array like:

 array(2) {
  ["sample"]=>
  array(2) {
    ["startYear"]=>
    string(4) "2000"
    ["endYear"]=>
    string(4) "2015"
  }
  ["second_sample"]=>
  array(2) {
    ["startYear"]=>
    string(4) "1986"
    ["endYear"]=>
    string(4) "1991"
  }
}

Is there beauty way to do this (cureently I'm using foreach, but I'm not sure it is a best solution).

Added a code example:

<?php
$str='[{"key":"sample","startYear":"2000","endYear":"2015"},{"key":"second_sample","startYear":"1986","endYear":"1991"}]';

$arr=json_decode($str);

var_dump($arr);

$newArr=array();

foreach ($arr as $value){
$value=(array)$value;
$newArr[array_shift($value)]=$value;

}

var_dump($newArr);

Using foreach sounds like a pretty sane approach to this.

Jonnix
– Jonnix

2015-11-18 13:47:22 +00:00
Commented Nov 18, 2015 at 13:47 — Jonnix
– Jonnix, Commented Nov 18, 2015 at 13:47

Mihai Matei · Accepted Answer · 2015-11-18 14:18:30Z

6

You can use array_reduce

$myArray = array_reduce($initialArray, function ($result, $item) {
    $item = (array) $item;

    $key = $item['key'];
    unset($item['key']);

    $result[$key] = $item;

    return $result;
}, array());

edited Nov 18, 2015 at 14:18

answered Nov 18, 2015 at 13:53

Mihai Matei

24.3k5 gold badges34 silver badges50 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

deceze Over a year ago

I'd explicitly get the key key instead of relying on the order with array_shift; JSON dictionaries have no intrinsic order.

Mihai Matei Over a year ago

You're right @deceze .. I will update my answer.. Thanks

mickmackusa · Accepted Answer · 2021-09-01 09:16:07Z

You can create the desired output without making any iterated function calls by using a technique called "array destructuring" (which is a functionless version of list()). Demo

Language Construct Style:

$result = [];
foreach ($array as $object) {
    [
        'key' => $key,
        'startYear' => $result[$key]['startYear'],
        'endYear' => $result[$key]['endYear']
    ] = (array)$object;
}
var_export($result);

Functional Style:

var_export(
    array_reduce(
        $array,
        function($result, $object) {
            [
                'key' => $key,
                'startYear' => $result[$key]['startYear'],
                'endYear' => $result[$key]['endYear']
            ] = (array)$object;
            return $result;
        },
        []
    )
);

Both will output:

array (
  'sample' => 
  array (
    'startYear' => '2000',
    'endYear' => '2015',
  ),
  'second_sample' => 
  array (
    'startYear' => '1985',
    'endYear' => '1991',
  ),
)

Narendrasingh Sisodia · Accepted Answer · 2015-11-19 04:55:11Z

0

Simply you can use array_map like as

$result = array_map('get_object_vars',$your_array);

Edited:

As after checking your code that you've added an example over here there's no need to use an extra functions or loop to convert your array of objects into associative array instead you simply need to pass second parameter true within json_decode function like as

$arr = json_decode($json,true);

Demo

edited Nov 19, 2015 at 4:55

answered Nov 18, 2015 at 14:00

Narendrasingh Sisodia

21.4k6 gold badges51 silver badges54 bronze badges

5 Comments

Rajesh Jadav Over a year ago

This does not provide an answer to the question. To critique or request clarification from an author, leave a comment below their post. - From Review

Don't Panic Over a year ago

@RajeshJadav How does this not provide an answer?

Rajesh Jadav Over a year ago

I think this answer should be comment

Narendrasingh Sisodia Over a year ago

First of all you're an android developer and user has requested for the answer that doesn't required foreach and did you tried this answer even once. @RajeshJadav

mickmackusa Over a year ago

The answer provably does not provide the correct result.

Vlad Moyseenko · Accepted Answer · 2022-12-04 15:45:57Z

0

An alternative to array_reduce and other provided solutions could be:

$list = array_combine(
  array_column($list, 'key'),
  array_map(fn ($item) => (array) $item, array_values($list))
);

Or:

$list = array_combine(
  array_column($list, 'key'),
  array_map('get_object_vars', $list)
);

answered Dec 4, 2022 at 15:45

Vlad Moyseenko

2434 silver badges9 bronze badges

Collectives™ on Stack Overflow

convert array with objects to one associative array without foreach

4 Answers 4

2 Comments

Comments

5 Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

4 Answers 4

2 Comments

Comments

5 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related