<?php $contacts = []; $contacts[0] = []; $contacts[1] = []; $contacts[2] = []; $contacts[0][] = 2; $contacts[1][] = 6; $contacts[2][] = 3; $contacts[0][] = 'Bldo'; $contacts[1][] = 'Cldo'; $contacts[2][] = 'Aldo'; $keys = array_column($contacts, 1); array_multisort($keys, SORT_ASC, $contacts); print_r($contacts);
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