关联数组PHP随机值

Question

我有关于php中的关联多维数组的任务。

假设我有下表：

Product Nr  Img
kat1    abc abc.png
kat1    xyz xyz.png
kat2    def def.png
kat2    gfh gfh.png
kat2    jug jug.png
kat3    lkj lkj.png
kat3    tfh tfh.png
kat4    fsg fsg.png
kat4    gzt gzt.png

构建一个数组，如：

$table= array(
  array("Product" => "Kat1","Nr" =>"abc","IMG" =>"abc.png"),
  array("Product" => "Kat1","Nr" =>"xyz","IMG" =>"xyz.png"),
  array("Product" => "Kat2","Nr" =>"def","IMG" =>"def.png"),
  array("Product" => "Kat2","Nr" =>"gfh","IMG" =>"gfh.png"),
  array("Product" => "Kat2","Nr" =>"jug","IMG" =>"jug.png"),
  array("Product" => "Kat3","Nr" =>"lkj","IMG" =>"lkj.png"),
  array("Product" => "Kat3","Nr" =>"tfh","IMG" =>"tfh.png"),
  array("Product" => "Kat4","Nr" =>"fsg","IMG" =>"fsg.png"),
  array("Product" => "Kat4","Nr" =>"gzt","IMG" =>"gzt.png"),

  );

我想构建随机产品集。 每个产品组应包含每个产品组合中的一种产品。 例如以下输出：

Kat1 = abc, abc.png
Kat2 = gfh, gfh.png
Kat3 = lkj, lkj.png
Kat4 = gzt, gzt.png

我不确定我是否采用正确的方式，或者是否可能采用这种阵列。 任何想法我怎么能解决这个问题？

Answer 1

您可以使用此mysql查询来获得所需的结果：

SELECT 
    *
FROM
    (SELECT 
        *
    FROM
        product
    ORDER BY RAND()) AS shuffled_products
GROUP BY PRODUCT;

一旦你在php中使用循环接收到结果数组，就将其操作为所需的结果。

Answer 2

1）尝试在视图中重建您的阵列（按类别分组）：

$tableGroupByCats = [
    "Kat1" => [
        ["Nr" =>"abc","IMG" =>"abc.png"],
        ["Nr" =>"xyz","IMG" =>"xyz.png"]
    ],
    "Kat2" => [
        ["Nr" =>"def","IMG" =>"def.png"],
        ["Nr" =>"gfh","IMG" =>"gfh.png"],
        ["Nr" =>"jug","IMG" =>"jug.png"]
    ],
    "Kat3" => [
        "Nr" =>"lkj","IMG" =>"lkj.png",
        "Nr" =>"tfh","IMG" =>"tfh.png"
    ],
    "Kat4" => [
        ["Nr" =>"fsg","IMG" =>"fsg.png"],
        ["Nr" =>"gzt","IMG" =>"gzt.png"]
    ]
];

以下代码将帮助您：

$table= array(
    array("Product" => "Kat1","Nr" =>"abc","IMG" =>"abc.png"),
    array("Product" => "Kat1","Nr" =>"xyz","IMG" =>"xyz.png"),
    array("Product" => "Kat2","Nr" =>"def","IMG" =>"def.png"),
    array("Product" => "Kat2","Nr" =>"gfh","IMG" =>"gfh.png"),
    array("Product" => "Kat2","Nr" =>"jug","IMG" =>"jug.png"),
    array("Product" => "Kat3","Nr" =>"lkj","IMG" =>"lkj.png"),
    array("Product" => "Kat3","Nr" =>"tfh","IMG" =>"tfh.png"),
    array("Product" => "Kat4","Nr" =>"fsg","IMG" =>"fsg.png"),
    array("Product" => "Kat4","Nr" =>"gzt","IMG" =>"gzt.png"),

);

$tableGroupByCats = [];
foreach ($table as $product) {
    $tableGroupByCats[$product['Product']][] = ["Nr" => $product["Nr"], "IMG" => $product["IMG"]];
}

或者您可以使用GROUP BY从DB中检索类似的数组

2）得到你的结果：

$result = [];
foreach ($tableGroupByCats as $ctegory => $products) {
    $randNum = mt_rand(0, (count($products)-1));
    $result[$ctegory] = $products[$randNum];
}

Answer 3

这是另一种方法：

码：

shuffle($table);
foreach($table as $row){
    $result[$row["Product"]]="{$row["Product"]} = {$row["Nr"]}, {$row["IMG"]}"; // overwrite duplicates
}
ksort($result);  // sort result array by Product ASC
var_export($result);

可能的输出：

array (
  'Kat1' => 'Kat1 = xyz, xyz.png',
  'Kat2' => 'Kat2 = jug, jug.png',
  'Kat3' => 'Kat3 = lkj, lkj.png',
  'Kat4' => 'Kat4 = gzt, gzt.png',
)