Simple Multi-Dimensional Key Sort

msort.php

<?php
/*

A simple multidimensional key-value sorting function, allowing you to sort an 
array by a multidimensional key without having to write callback functions. 
This concept appears to be missing in PHP, this function allows for easy array 
sorting. Works with both strings and numbers, case sensitive and doesn't 
drop/mash keys. PHP 5.3.0 > only.

via: http://projects.westhost.com/contest/php/function/simple-multi-dimensional-key-sort/151

*/

function msort ($data, $k, $options = array()) {
 
	usort($data, function($a, $b) use (&$k, &$options) {
 
		list($a,$b) = ((isset($options['DESC']) && $options['DESC'] == True) ?
			array($a[$k], $b[$k]) : array($b[$k], $a[$k]));
 
		if ($a == $b) return 0;
 
		if (is_string($a) && is_string($b)) {
			return strcmp(strtolower($b), strtolower($a));
		} else {
			return ($a > $b) ? -1 : 1;
		}
 
	});
 
	return $data;
}
 
// USAGE
// $data = msort($data, 'key', $sortArgs);
// $sortArgs only takes one variable presently, but could be easily extended for further functionality:
 
// $sortArgs = array ('DESC'=>True); // Sort in Descending order
// $sortArgs = array ('DESC'=>False); or, $sortArgs = NULL; // Sort in Ascending order
 
 
// EXAMPLES
//
// $fruits = array(
//	array('name'=>'PiNeApPlE', 'qty'=>11),
//	array('name'=>'pineapple', 'qty'=>2),
//	array('name'=>'apple', 'qty'=>72),
//	array('name'=>'lime', 'qty'=>9),
//	array('name'=>'starfruit', 'qty'=>1),
//	array('name'=>'coconut', 'qty'=>3),
//	array('name'=>'banana', 'qty'=>12)
// );
//
// $fruits = msort($fruits, 'qty', array('DESC'=>True));
// $fruits = msort($fruits, 'name');
// $fruits = msort($fruits, 'name', array('DESC'=>True));
?>