首先，我使用的是Laravel 5.1（PHP框架），我正在运行PHP 5.6.4，我遇到的问题与递归有关。
目前我的种子文件是（递归函数的借口很差）：
<?php
use Illuminate\Database\Seeder;
use Illuminate\Database\Migrations\Migration;
use eCommerce\Category;
class CategoryCategorySeeder extends Seeder
{
protected $addressHolder;
public function __construct() {
$this->addressHolder = array();
}
private function recursive($array, $depth=0) {
echo $depth."\n";
foreach($array as $category){
// print_r( $category['category_id'] );
if( isset( $category['sub_categories'] ) ){
$this->recursive($category['sub_categories'], $depth++);
} else {
}
}
}
public function run()
{
DB::table('category_category')->delete();
$categories = [
[
'category_id' => 2,
'sub_categories' => [
[
'category_id' => 3,
'sub_categories' => [
[
'category_id' => 6
],[
'category_id' => 7
],[
'category_id' => 8
],[
'category_id' => 9
],[
'category_id' => 10
],[
'category_id' => 11
],[
'category_id' => 12
],[
'category_id' => 13
],[
'category_id' => 14
],[
'category_id' => 15
]
]
],[
'category_id' => 4,
'sub_categories' => [
[
'category_id' => 18
],[
'category_id' => 19
],[
'category_id' => 20
],[
'category_id' => 21
],[
'category_id' => 22
],[
'category_id' => 23
],[
'category_id' => 24
],[
'category_id' => 25
],[
'category_id' => 26
],[
'category_id' => 27
],[
'category_id' => 28
],[
'category_id' => 29
],[
'category_id' => 30
],[
'category_id' => 31
],[
'category_id' => 32
]
]
],[
'category_id' => 5,
'sub_categories' => [
[
'category_id' => 16
],[
'category_id' => 17
]
]
]
]
],[
'category_id' => 33,
'sub_categories' => [
[
'category_id' => 34
],[
'category_id' => 35
],[
'category_id' => 36,
'sub_categories' => [
[
'category_id' => 37
],[
'category_id' => 38
],[
'category_id' => 39
],[
'category_id' => 40
],[
'category_id' => 41
],[
'category_id' => 42
],[
'category_id' => 43
],[
'category_id' => 44
],[
'category_id' => 45
]
]
]
]
],[
'category_id' => 46,
'sub_categories' => [
[
'category_id' => 50
],[
'category_id' => 51,
'sub_categories' => [
[
'category_id' => 54
],[
'category_id' => 55
],[
'category_id' => 56
],[
'category_id' => 57
]
]
],[
'category_id' => 52
],[
'category_id' => 53
],[
'category_id' => 137
]
]
],[
'category_id' => 47,
'sub_categories' => [
[
'category_id' => 58
],[
'category_id' => 59
],[
'category_id' => 60
],[
'category_id' => 61
],[
'category_id' => 62
],[
'category_id' => 63
],[
'category_id' => 64
],[
'category_id' => 65
],[
'category_id' => 66
],[
'category_id' => 67
],[
'category_id' => 68
],[
'category_id' => 69
],[
'category_id' => 70
],[
'category_id' => 71
],[
'category_id' => 72
]
]
],[
'category_id' => 48,
'sub_categories' => [
[
'category_id' => 73,
'sub_categories' => [
[
'category_id' => 78
],[
'category_id' => 79
]
]
],[
'category_id' => 74,
'sub_categories' => [
[
'category_id' => 80
],[
'category_id' => 81
],[
'category_id' => 82
],[
'category_id' => 83
]
]
],[
'category_id' => 75,
'sub_categories' => [
[
'category_id' => 84
],
[
'category_id' => 85
],
[
'category_id' => 86
]
]
],[
'category_id' => 76,
'sub_categories' => [
[
'category_id' => 87
],[
'category_id' => 88,
'sub_categories' => [
[
'category_id' => 93
],[
'category_id' => 94
],[
'category_id' => 95
]
]
],[
'category_id' => 89
],[
'category_id' => 90
],[
'category_id' => 91
],[
'category_id' => 92
]
]
],[
'category_id' => 77
]
]
],[
'category_id' => 49,
'sub_categories' => [
[
'category_id' => 96
],[
'category_id' => 97
],[
'category_id' => 98
],[
'category_id' => 99
],[
'category_id' => 100
],[
'category_id' => 135
],[
'category_id' => 136
],[
'category_id' => 138
],[
'category_id' => 139
],[
'category_id' => 140
]
]
],[
'category_id' => 134,
'sub_categories' => [
[
'category_id' => 101,
'sub_categories' => [
[
'category_id' => 108
],[
'category_id' => 109
],[
'category_id' => 110
]
]
],[
'category_id' => 102,
'sub_categories' => [
[
'category_id' => 111
],[
'category_id' => 112
],[
'category_id' => 113
]
]
],[
'category_id' => 103,
'sub_categories' => [
[
'category_id' => 114
],[
'category_id' => 115
],[
'category_id' => 116
],[
'category_id' => 117
],[
'category_id' => 118
]
]
],[
'category_id' => 104
],[
'category_id' => 105
],[
'category_id' => 106,
'sub_categories' => [
[
'category_id' => 119
],[
'category_id' => 120
],[
'category_id' => 121
],[
'category_id' => 122
],[
'category_id' => 123
],[
'category_id' => 124
],[
'category_id' => 125
],[
'category_id' => 126
],[
'category_id' => 127
]
]
],[
'category_id' => 107
]
]
],[
'category_id' => 128,
'sub_categories' => [
[
'category_id' => 129
],[
'category_id' => 130
],[
'category_id' => 131
],[
'category_id' => 132
],[
'category_id' => 133
]
]
],[
'category_id' => 134
],[
'category_id' => 141,
'sub_categories' => [
[
'category_id' => 142
]
]
]
];
$this->recursive($categories);
}
}
我想以递归方式遍历每个“类别”（大型多维数组）并制作一个“地址”，这是该类别来自类别层次结构的地方，这是因为在我的网站上一个类别可以属于到许多其他类别。
此种子类，如果对于多对多关系类别的数据透视表有。
在数据透视表中，我有：
所以可以是一个例子（代码中的数组也是如此）：
所以“2-3-6”是该类别6的特定实例的层次结构中的完整“地址”。
那么我如何以递归方式读取我的类别数组并在数据透视表中为每个类别输入上述三个字段？
答案 0 :(得分：0)
我用以下代码解决了这个问题。
我只是拿着一个外部数组来记住每次迭代的位置，然后使用函数内部的另一个数组填充ids对应的类别信息并将其全部内容包含在内，这就是我需要解决的问题。作为slugs的数据透视表中的项是唯一的，并且可以用作SEO原因的路由参数。
private function recursive($categories, $depth=0)
{
foreach($categories as $category) {
array_push($this->locationHolder, $category['category_id']);
if($depth == 0){
$parent_id = 1;
} else {
$parent_id = $this->locationHolder[$depth-1];
}
$address_array = [];
foreach($this->locationHolder as $id) {
array_push($address_array, Category::find($id)->slug);
}
DB::table('category_category')->insert([
'category_id' => $category['category_id'],
'parent_id' => $parent_id,
'address' => implode("_", $address_array)
]);
if(isset($category['sub_categories'])) {
$this->recursive($category['sub_categories'], $depth + 1);
} else {
array_pop($this->locationHolder);
}
}
array_pop($this->locationHolder);
}