将字符转合并成有父子及关系的多维数组

<?php

/*
 * 将A,B两个多维数组合并为C数组
 * A,B数组均为关联数组
 * 若key在A,B中均存在，追加合并
 */

function format($string)
{
    $arr = explode("/", $string);
    $result = null;
    // 弹出最后一个元素
    for ($i = count($arr) - 1; $i >= 0; $i--) {
        if ($result === null) {
            $result = $arr[$i];
        } else {
            $result = array($arr[$i] => $result);
        }
    }
    return ($result);
}

function my_merge(&$a, $b)
{
    foreach ($a as $key => &$val) {
        if (is_array($val) && array_key_exists($key, $b) && is_array($b[$key])) {
            my_merge($val, $b[$key]);
            $val = $val + $b[$key];

        } else if (is_array($val) || (array_key_exists($key, $b) && is_array($b[$key]))) {
            if (isset($b[$key]) && is_array($b[$key])) {
                foreach ($b[$key] as $key2 => $value2) {
                    $b[$key][$val] = array();
                }
                $val = is_array($val) ? $val : $b[$key];
            }
        }
    }

    $a = $a + $b;
    return $a;
}
function format_data($array)
{
    $i = $j = 0;
    $tempArray = array();
    if (!is_array($array)) {
        if (!empty($array)) {
            $tempArray[$j]['name'] = $array;
        }
        return $tempArray;
    }
    foreach ($array as $key => $value) {
        if (is_array($value) && !empty($value)) {
            // print_r($value);
            unset($value['']);
            $tempArray[$j]['name'] = $key;
            $tempArray[$j]['children'] = format_data($value);
        } else {
            if (!empty($value)) {
                $tempArray[$j]['name'] = $value;
            } else {
                $tempArray[$j]['name'] = $key;
            }
        }
        $j++;
    }
    return $tempArray;
}

$strings = array(
    '客户单位3/单位1/kek222/',
    '客户单位3/单位2/kek/',
    '11111/客户单位1/客户单位4/asd/客户单位2/',
);
$result = array();
sort($strings);
foreach ($strings as $string) {
    if (empty($result)) {
        $result = format($string);
    } else {
        if (is_array($result) && is_array(format($string))) {
            $result = my_merge($result, format($string));
        }
    }
}

$result = format_data($result);
print_r($result);
die;