php ordenar array por clave
$weight = [
'Pete' => 75,
'Benjamin' => 89,
'Jonathan' => 101
];
ksort($weight);
php ordenar matriz de matriz por clave
$inventory = [
['price' => 10.99, 'product' => 'foo 1'],
['price' => 5.99, 'product' => 'foo 2'],
['price' => 100, 'product' => 'foo 3'],
];
$price = array_column($inventory, 'price');
array_multisort($price, SORT_DESC, $inventory);