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<?php $array = [ ['id' => 1, 'city' => 'Melbourne', 'user_name' => 'user_1'], ['id' => 2, 'city' => 'Melbourne', 'user_name' => 'user_1'], ['id' => 3, 'city' => 'Sydney', 'user_name' => 'user_2'], ['id' => 4, 'city' => 'Perth', 'user_name' => 'user_3'], ['id' => 5, 'city' => 'Perth', 'user_name' => 'user_4'] ]; var_export( array_map( 'count', array_reduce( $array, function($result, $row) { $result[$row['city']][$row['user_name']] = true; return $result; } ) ) );
Output for git.master, git.master_jit, rfc.property-hooks
array ( 'Melbourne' => 1, 'Sydney' => 1, 'Perth' => 2, )

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