PhP Group array result or dump array result [duplicate]

Question

I have the following php array and would like to group the results:

array:3 [▼
  1 => array:4 [▼
    "trashed" => 1
    "passed" => 0
    "failed" => 2
    "unknown" => 0
  ]
  2 => array:4 [▼
    "trashed" => 0
    "passed" => 1
    "failed" => 0
    "unknown" => 3
  ]
  3 => array:4 [▼
    "trashed" => 0
    "passed" => 0
    "failed" => 0
    "unknown" => 0
  ]
]

How can i group them for example: without going through loops? I would love to learn about an array_sort or merge function that does this :D

$trashed = [1, 0, 0];
$passed = [0, 1, 0];

I can rename the $key to anything if numbers is better approach or may assist in answering the question.

There will not be any null $keys or $values in this.

I'm currently doing it like this, but it seems ugly:

$trashed = [];
    
foreach($months as $month){
    array_push($trashed, $month['trashed']);
}

@Cid nothing really, I'm just interested in learning a new approach if available/possible :) — RG Servers
– RG Servers, Commented Nov 15, 2020 at 8:53

Ro Achterberg · Accepted Answer · 2020-11-15 09:28:14Z

You may want to use array_column() for this, as is demonstrated by the example below. Keep in mind though, that array_column() does internal looping of its own. It's good to see you're eager to learn new/other solutions, but generally performance and simplicity are some of the basic goals of any application.

If you want to avoid using a loop, then I suggest building the array differently in the first place. Why not use the trashed etc. keys as keys to their own respective arrays?

Here's one possible approach using array_column(). See comments for explanation and output.

<?php

// Your input array.
$a = [
    1 => [
            'trashed' => 1,
            'passed' => 0,
            'failed' => 2,
            'unknown' => 0
    ],
    2 => [
            'trashed' => 0,
            'passed' => 1,
            'failed' => 0,
            'unknown' => 3
    ],
    3 => [
            'trashed' => 0,
            'passed' => 0,
            'failed' => 0,
            'unknown' => 0
    ],
];

// Fetch all values for each key and return them as an array.
$trashed = array_column($a, 'trashed');
$passed = array_column($a, 'passed');
$failed = array_column($a, 'failed');
$unknown = array_column($a, 'unknown');

var_dump($trashed);
var_dump($passed);
var_dump($failed);
var_dump($unknown);
/*
Output:
array(3) {
  [0]=>
  int(1)
  [1]=>
  int(0)
  [2]=>
  int(0)
}
array(3) {
  [0]=>
  int(0)
  [1]=>
  int(1)
  [2]=>
  int(0)
}
array(3) {
  [0]=>
  int(2)
  [1]=>
  int(0)
  [2]=>
  int(0)
}
array(3) {
  [0]=>
  int(0)
  [1]=>
  int(3)
  [2]=>
  int(0)
}
*/

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