Преобразование массива в рекурсивный многомерный массив
Как конвертировать
array('51' => '53', '52' => '53', '53' => '', '54' => '', '56' => '54', '57' => '54', '58' => '54', '59' => '51', '60' => '', '61' => '', '62' => '', '63' => '', '64' => '', '65' => '', '66' => '', '67' => '', '68' => '', '69' => '', '71' => '' )
к
array('63' => '', '71' => '', '70' => '', '69' => '', '68' => '', '67' => '', '66' => '', '65' => '', '64' => '', '62' => '', '61' => '', '60' => '', '54' => array('56' => '', '57' => '', '58' => ''), '53' => array('51' => array('59' => ''), '52' => '') )