這裡沒有用遞迴查詢，而是用得另一種處理方法
思路：獲取到資料庫的所有分類，通過**，根據pid，返回分類樹，
方法**如下：
/**
* 分類樹
*/public static function gettree($data)
//halt($items);
$tree = ;
foreach ($items as $id=>$item)else
}return $tree;
}
呼叫分類樹之前：(我在查詢返回後，就把id轉換為category_id了，下面得category_id就是資料庫對應得id)
^ array:11 [
0 => array:3 [
"category_id" => 11
"name" => "小公尺8"
"pid" => 2
] 1 => array:3 [
"category_id" => 10
"name" => "顯示器"
"pid" => 6
] 2 => array:3 [
"category_id" => 9
"name" => "主機板"
"pid" => 6
] 3 => array:3 [
"category_id" => 8
"name" => "聯想"
"pid" => 5
] 4 => array:3 [
"category_id" => 7
"name" => "戴爾"
"pid" => 5
] 5 => array:3 [
"category_id" => 6
"name" => "華碩"
"pid" => 5
] 6 => array:3 [
"category_id" => 5
"name" => "電腦"
"pid" => 0
] 7 => array:3 [
"category_id" => 4
"name" => "小公尺10"
"pid" => 2
] 8 => array:3 [
"category_id" => 3
"name" => "紅公尺"
"pid" => 2
] 9 => array:3 [
"category_id" => 2
"name" => "小公尺"
"pid" => 1
] 10 => array:3 [
"category_id" => 1
"name" => "手機"
"pid" => 0
]]
^ array:2 [
0 => array:4 [
"category_id" => 5
"name" => "電腦"
"pid" => 0
"list" => array:3 [
0 => array:3 [
"category_id" => 8
"name" => "聯想"
"pid" => 5
]1 => array:3 [
"category_id" => 7
"name" => "戴爾"
"pid" => 5
]2 => array:4 [
"category_id" => 6
"name" => "華碩"
"pid" => 5
"list" => array:2 [
0 => array:3 [
"category_id" => 10
"name" => "顯示器"
"pid" => 6
]1 => array:3 [
"category_id" => 9
"name" => "主機板"
"pid" => 6]]
]]] 1 => array:4 [
"category_id" => 1
"name" => "手機"
"pid" => 0
"list" => array:1 [
0 => array:4 [
"category_id" => 2
"name" => "小公尺"
"pid" => 1
"list" => array:3 [
0 => array:3 [
"category_id" => 11
"name" => "小公尺8"
"pid" => 2
]1 => array:3 [
"category_id" => 4
"name" => "小公尺10"
"pid" => 2
]2 => array:3 [
"category_id" => 3
"name" => "紅公尺"
"pid" => 2]]
]]]]
這就完成了，根據pid分類的效果。
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