二维数组转为树形if (!function_exists('tree')) {

function tree(array $array, $superior_id = 0, $superior_key = 'superior_id', $primary_key = 'cate_id', $son_key = 'son') :array

{

$return = [];

foreach ($array as $k => $v) {

if ($v[$superior_key] == $superior_id) {

$son = tree($array, $v[$primary_key], $superior_key, $primary_key, $son_key);

if ($son) $v[$son_key] = $son;

$return[] = $v;

}

}

return $return;

}

}

树形结构转为二维数组if (!function_exists('un_tree')) {

function un_tree(array $array, $son_key = 'son', $times = 0) :array

{

$return = [];

$times += 1;

if (!empty($array)) {

foreach ($array as $key => $value) {

$son = isset($value[$son_key]) ? $value[$son_key] : '';

if ($son) unset($value[$son_key]);

$value['times'] = $times;

array_push($return, $value);

if ($son) $return = array_merge($return, un_tree($son, $son_key, $times));

}

}

return $return;

}

}