Array Sorter Function - Sort by Nested Key

gistfile1.aw

<?php

$a = array(
	array('community_id'=>5,  'community_name'=>'Meadows'),
	array('community_id'=>7,  'community_name'=>'Grosse Pointe'),
	array('community_id'=>12, 'community_name'=>'Mountain View'),
	array('community_id'=>6,  'community_name'=>'Seaside'),
);

function buildSorter($key) { 
    return function ($a, $b) use ($key) { 
        return strnatcmp($a[$key], $b[$key]); 
    }
}

usort($a, buildSorter('community_name'));
var_dump($a);