Online PHP editor | refs for csppI

<?php $array = [ ['Categoria' => 'example', 'Servico' => 'name1'], ['Categoria' => 'example', 'Servico' => 'name2'], ['Categoria' => 'example', 'Servico' => 'name3'], ['Categoria' => 'example2', 'Servico' => 'name4'], ['Categoria' => 'example2', 'Servico' => 'name5'], ['Categoria' => 'example2', 'Servico' => 'name6'], ['Categoria' => 'example3', 'Servico' => 'name7'], ['Categoria' => 'example3', 'Servico' => 'name8'], ['Categoria' => 'example3', 'Servico' => 'name9'] ]; var_export( array_values( array_reduce( $array, function ($carry, $row) { $carry[$row['Categoria']]['Servico'] = $row['Categoria']; $carry[$row['Categoria']]['children'][] = $row['Servico']; return $carry; } ) ) );