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run code in 200+ php & hhvm versions
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<?php $abc = array( 'rec_1' => array('fn'=>'Aron','ln'=>'Michaelson'), 'rec_2' => array('fn'=>'Abbey','ln'=>'Drake'), 'rec_3' => array('fn'=>'Alice','ln'=>'Peterson')); /*function build_sorter($key) { return function ($a, $b) use ($key) { return strnatcmp($a[$key], $b[$key]); }; } */ function SortByLname($a,$b) { return strcmp( $a['ln'], $b['ln'] ); } usort($abc, "SortByLname"); foreach ($abc as $item) { echo strtoupper($item['ln']) . ', ' . $item['fn'] . "\n"; }
based on ZsRpb
Output for 4.3.0 - 7.2.0
DRAKE, Abbey MICHAELSON, Aron PETERSON, Alice