php7SpaceshipOperator.php

<?php
//example
$array = [
    [
        'foo' => 5.5,
        'bar' => 'abc'
    ],
    [
        'foo' => 7.7,
        'bar' => 'xyz'
    ],
    [
        'foo' => 2.2,
        'bar' => 'efg'
    ]
];

// Sort $array by 'foo' property, ascending
usort($array, function ($a, $b) {
    return $a['foo'] <=> $b['foo'];
});

// Sort $array by 'bar' property, descending
usort($array, function ($a, $b) {
    return $b['bar'] <=> $a['bar'];
});