php sort array of array by key

1$inventory = array(
2
3   array("type"=>"fruit", "price"=>3.50),
4   array("type"=>"milk", "price"=>2.90),
5   array("type"=>"pork", "price"=>5.43),
6
7);
8$price = array_column($inventory, 'price');
9array_multisort($price, SORT_DESC, $inventory);

1  $weight = [
2    'Pete' => 75, 
3    'Benjamin' => 89,
4    'Jonathan' => 101
5  ];  	
6  ksort($weight);

1$inventory = [
2	['price' => 10.99, 'product' => 'foo 1'],
3    ['price' => 5.99, 'product' => 'foo 2'],
4  	['price' => 100, 'product' => 'foo 3'],
5  
6];
7
8$price = array_column($inventory, 'price');
9
10array_multisort($price, SORT_DESC, $inventory);