PHP Get array of a property from array of objects

Question

I have an API that sends me the data in the format

[{"part_no":"AAA"},{"part_no":"BBB"},{"part_no":"CCC"},......{"part_no":"ZZZ"}]

I want to create an array like ["AAA", "BBB", ...., "ZZZ"] from the above array.

I know it's possible by iterating the array item by item, and appending it to a new array, but thought that there might be a better (and hopefully faster) approach.

Like C# hasLinq that does this all in a one-liner, JS has map, it is possible to do a similar thing in PHP ?

`$out = array_map(fn($item) => $item['part_no'], $in);` or, if it's a simple associative array: `$out = array_column($in, 'part_no');` — Yoshi, Sep 30 '20 at 08:44
Prior to PHP7.4: `$out = array_map(function ($part) { return $part['part_no']; }, json_decode($data, true));` — Nick, Sep 30 '20 at 08:47
_and hopefully faster_ Of course there are one liners in PHP, but it is _not faster than looping_. — nice_dev, Sep 30 '20 at 08:52
@Nick, got it working.. thanks ! it shouldn't have `json_decode` in the end. Just passing the array solved it — mrid, Sep 30 '20 at 09:30
@mrid ah cool, was just about to post this link https://3v4l.org/PXQ1P — Nick, Sep 30 '20 at 09:34

score 0 · Answer 1 · answered Sep 30 '20 at 08:50

<?php

$json = '[{"part_no":"AAA"},{"part_no":"BBB"},{"part_no":"CCC"},{"part_no":"ZZZ"}]';
$data = json_decode($json, true);

$result = array_column($data, 'part_no');
var_export($result);

Output:

array (
    0 => 'AAA',
    1 => 'BBB',
    2 => 'CCC',
    3 => 'ZZZ',
  )

PHP Get array of a property from array of objects

1 Answers1