Online PHP editor | refs for 4JYXF

<?php $abc = array( 'rec_1' => array('fn'=>'Aron','ln'=>'Michaels'), 'rec_2' => array('fn'=>'Abbey','ln'=>'Drake'), 'rec_3' => array('fn'=>'Alice','ln'=>'Peterson')); function build_sorter($key) { return function ($a, $b) use ($key) { return strcmp($a[$key], $b[$key]); }; } usort($abc, build_sorter('ln')); foreach ($abc as $item) { echo $item['ln'] . ', ' . $item['fn'] . "\n"; }