Online PHP editor | refs for 1PPr3

<?php $users = [['username' => 'Timothy'], ['username' => 'Frederic']]; $users2 = [['username' => 'Johnathon'], ['username' => 'Frederic'], ['username' => 'Peter']]; $counts = array_count_values( [ ...array_column($users, 'username'), ...array_column($users2, 'username') ] ); foreach ($counts as $user => $count) { printf( "<option%s>%s</option>\n", $count > 1 ? ' selected' : '', htmlentities($user) ); }