Answers for "sorting an associative array using one of the fields in php"

php sort array of array by key

$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);

php sort hight to low

$letters=array("b","a","c");
arsort($letters); //referse sort an array ("c","a","b")