How to perform a natural sort in php using usort

Question

Does anyone know what the function is to perform a natural order sort using the usort function in PHP on an object.

Lets say the object ($obj->Rate)has a range of v

Answer 1

Use strnatcmp for your comparison function. e.g. it's as simple as

function mysort($a, $b) {
   return strnatcmp($a->rate, $b->rate);
}

Answer 2

There are a few ways to sort by your Rate properties in a numeric and descending.

Here are some demonstrations based on your input:

$objects = [
    (object)['Rate' => '10'],
    (object)['Rate' => '1'],
    (object)['Rate' => '2'],
    (object)['Rate' => '20'],
    (object)['Rate' => '22']
];

array_multisort() is clear and expressive: (Demo)

array_multisort(array_column($objects, 'Rate'), SORT_DESC, SORT_NUMERIC, $objects);

usort(): (Demo)

usort($objects, function($a, $b) {
    return $b->Rate <=> $a->Rate;
});

usort() with arrow function syntax from PHP7.4: (Demo)

usort($objects, fn($a, $b) => $b->Rate <=> $a->Rate);

PHP's spaceship operator (<=>) will automatically evaluate two numeric strings as numbers -- no extra/iterated function calls or flags are necessary.