Custom sort multidimensional array

gistfile1.php

<?php

	// Array with data
	$teams = array
	(
		array('name' => 'Maple Leafs', 'city' => 'Toronto'),
		array('name' => 'Canucks', 'city' => 'Vancouver'),
		array('name' => 'Senators', 'city' => 'Ottawa'),
		array('name' => 'Canadiens', 'city' => 'Montreal'),
		array('name' => 'Flames', 'city' => 'Calgary'),
		array('name' => 'Oilers', 'city' => 'Edmonton'),
		array('name' => 'Jets', 'city' => 'Winnipeg')
	);

	// Custom sort multidimensional array
	usort($teams, function($a, $b)
	{
		return strnatcasecmp($a['city'], $b['city']);
	});

	// Display sorted data
	print_r($teams);