How to sort a line consisting of numbers with a separator?

Question

PHP

there is an array of strings

10/22/300
10/21/300
9/5/5/6

need to make it happen

9/5/5/6
10/21/300
10/22/300

That is, sorting should be by all data consisting of a substring. And nesting can be unlimited.

It is clear that in order to get these substrings, you need to use the command
$element = explode('/', $item);

First element, for example, it will turn into
[9,5,5,6]

Answer 1

Even I didn’t understand ... so it doesn’t work?

<?php

$ar = [
    '10/22/300',
    '10/21/300',
    '9/5/5/6'
    ];

natsort($ar);

print_r($ar);

/* RESULT

Array
(
    [2] => 9/5/5/6
    [1] => 10/21/300
    [0] => 10/22/300
)

*/

Answer 2

If I understood the problem correctly, then you can try this:

$array = [
    '10/22/300',
    '10/21/300',
    '9/5/5/6'
];

usort($array, function($a, $b) {
    $a = array_sum(explode('/', $a));
    $b = array_sum(explode('/', $b));
    return ($a == $b ? 0 : ($a < $b ? -1 : 1));
});

print_r($array);

The idea is that we sort by the sum of the numbers obtained from each line.
But you need to test on more examples.