Online PHP editor | refs for b5No7

<?php $counted_array = [ ["ELA-2", 7], ["Science-3", 9], ["ELA-1", 5], ["Science-2", 9], ["ELA-4", 2], ["ELA-3", 7], ["Science-4", 2], ["Science-1", 1] ]; $assoc_array = array_map( function($subarray){ return array_combine( ['Subject', 'Level'], explode('-', $subarray[0], 2) ) + ['Count' => $subarray[1]]; }, $counted_array ); usort($assoc_array, function($a, $b) { return [$a['Subject'], $a['Level']] <=> [$b['Subject'], $b['Level']]; }); var_export($assoc_array);