PHP array sort by number of items

Question

I need to sort my array-based on the number of elements in the inner array. It's my current array.

Array
(
    [0] => Array
        (
        )

    [1] => Array
        (
            [0] => 2-3
        )

    [2] => Array
        (
            [0] => 5-9
        )

    [3] => Array
        (
            [0] => 5-9
            [1] => 2-3
        )

)

I need to sort the array by this format.

Array
(
[3] => Array
        (
            [0] => 5-9
            [1] => 2-3
        )

    [2] => Array
        (
            [0] => 5-9
        )

    [1] => Array
        (
            [0] => 2-3
        )

[0] => Array
        (
        )

)

Zombo · Accepted Answer · 2021-03-31 21:27:10Z

2

This seems to do it:

<?php

$a = [
   [], ['2-3'], ['5-9'], ['5-9', '2-3']
];

$f = fn ($b, $c) => count($c) <=> count($b);
usort($a, $f);
print_r($a);

https://php.net/function.usort

answered Mar 31, 2021 at 21:27

Zombo

1

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Comments

ahmed abdelaty · Accepted Answer · 2021-03-31 21:51:24Z

1

i hope this answer help you

$result  = array();
$sorter  = array();
foreach($values as $key => $vals){
  $sorter[$key]= count($vals);
}
arsort($sorter);
foreach ($sorter as $ii => $va) {
  $result[$ii]=$values[$ii];
}

output

answered Mar 31, 2021 at 21:51

ahmed abdelaty

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