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<?php $info = [ ['car' => 'Audi', 'previous_car' => 'BMW'], ['car' => 'Audi', 'previous_car' => 'Seat'], ['car' => 'Audi', 'previous_car' => 'BMW'], ['car' => 'BMW', 'previous_car' => 'BMW'], ['car' => 'Ford', 'previous_car' => 'Seat'], ]; $result = []; foreach ($info as $row) { foreach ($row as $k => $v) { $result[$k][$v] = ($result[$k][$v] ?? 0) + 1; } } var_export($result);
Output for git.master, git.master_jit, rfc.property-hooks
array ( 'car' => array ( 'Audi' => 3, 'BMW' => 1, 'Ford' => 1, ), 'previous_car' => array ( 'BMW' => 3, 'Seat' => 2, ), )

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