Sort Array by Number and Boolean

Question

I have an array, every item has a number from 1-10, and every item has boolean value.

I want to sort it, so every item with boolean is in the first part of the array, but it should also be sort by number

Example. This is simplified the initial Array

Item1: Number 3, Boolean false Item2: Number 8, Boolean true Item3: Number 4, Boolean false Item4: Number 2, Boolean true

This Array Should look like this Item2: Number 8, Boolean true Item4: Number 2, Boolean true Item3: Number 4, Boolean false Item1: Number 3, Boolean false

I already got this function

$refarr = array_sort($refarr, 'refweights', SORT_DESC);

which sort the Array like this Item2: Number 8, Boolean true Item3: Number 4, Boolean false Item1: Number 3, Boolean false Item3: Number 2, Boolean true

Is there any other way to archive what i than to split the initial Array into two Arrays (Boolean True and false), sort this by number, and bring them back together?

You’ll want to use `usort` here, with your own little comparison function that compares two items by your specified criteria. — 04FS, Jan 29 '20 at 14:20

Ronak Dhoot · Accepted Answer · 2020-01-30T18:53:07.447

1

use usort with custom sorting...

<?php

$arr = array(
    array(2, false),
    array(2, true),
    array(3, false),
    array(8, true),
    array(4, false),
    );

usort($arr, function ($a, $b){
    if ($a[0] === $b[0]) {
        return 0;
    }
    return ($a[0] < $b[0]) ? 1 : -1;
});
usort($arr, function ($a, $b){
    if ($a[1] === $b[1]) {
        return 0;
    }
    return ($a[1] < $b[1]) ? 1 : -1;
});
print_r($arr);

output:


Array
(
    [0] => Array
        (
            [0] => 8
            [1] => 1
        )

    [1] => Array
        (
            [0] => 2
            [1] => 1
        )

    [2] => Array
        (
            [0] => 4
            [1] => 
        )

    [3] => Array
        (
            [0] => 3
            [1] => 
        )

    [4] => Array
        (
            [0] => 2
            [1] => 
        )

)

Refer: https://www.php.net/manual/en/function.usort.php

edited Jan 30 '20 at 18:53

answered Jan 29 '20 at 14:22

Ronak Dhoot

2,322
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This sort is incorrect. https://3v4l.org/qRg4J – nice_dev Jan 29 '20 at 14:34
Updated: https://ideone.com/JbJmZu – Ronak Dhoot Jan 29 '20 at 14:54
Still doesn't work. https://3v4l.org/2uZTn You should first check with truthy or falsy values and then numbers. – nice_dev Jan 30 '20 at 07:34
Updated code https://ideone.com/2b6P3Z – Ronak Dhoot Jan 30 '20 at 18:53
1

Does it works ? – Ronak Dhoot Feb 01 '20 at 15:12
No. it doesn't https://3v4l.org/TZiBi You are comparing booleans with < or > sign. I think it's easy to check boolean equality and then sort based on value like https://3v4l.org/bciPG – nice_dev Feb 01 '20 at 16:52

Sort Array by Number and Boolean

1 Answers1