How to sort an array of associative arrays by value of a given key in PHP?

Question

Given this array:

$inventory = array(

   array(\"type\"=>\"fruit\", \"price\"=>3.50),
   array(\"type\"=>\"milk\", \"price\"=>2.90),
   array(\"         


        

Answer 1

This function is re-usable:

function usortarr(&$array, $key, $callback = 'strnatcasecmp') {
    uasort($array, function($a, $b) use($key, $callback) {
        return call_user_func($callback, $a[$key], $b[$key]);
    });
}

It works well on string values by default, but you'll have to sub the callback for a number comparison function if all your values are numbers.