Question

我有一个产品数组，其中包含按显示顺序排序的产品列表。

$products = array(
[0] = array(
 "productID" => 189736,
 "title" => "Spice Girls Album",
 "category" => "CD",
 "order" => "0"
),
[1] = array(
 "productID" => 23087,
 "title" => "Snakes on a plane",
 "category" => "DVD",
 "order" => "0"
),
[2] = array(
 "productID" => 9874,
 "title" => "The Beatles Album",
 "category" => "CD",
 "order" => "1"
), ... etc etc

我正在试图找出将其变成类似数组的逻辑：

$categories = array(
   [0] => array(
        "title" => "CD",
        "products" => array (
            [0] => "Spice Girls Album",
            [1] => "The Beatles Album"
        ) 
    ),
   [1] => array(
        "title" => "DVD",
        "products" => array (
            [0] => "Snakes on a plane"
        ) 
)

因此，对于我拥有的每种产品：

if (!in_array($product['cateogry'], $categories)){
    $categories[] = $product['cateogry'];
    $categories[$product['category']][] = $product; 
} else {
    $categories[$product['category']][];
}

但这不起作用，因为我不认为in_array正在检查类别数组。有没有人对解决这个问题的最佳方法有什么建议？非常感谢

Answer 1

您对$categories[$product['category']][] = $product有正确的想法。您需要检查的是$product['category']中是否存在密钥$categories：

if (array_key_exists($product['category'], $categories)) {
    $categories[$product['category']]['products'][] = $product['title'];
} else {
    // initialize category data with first product
    $categories[$product['category']] = array(
        'title' => $product['category'],
        'products' => array($product)
    );
}

这将为您提供以下形式的数组：

$categories = array(
   "CD" => array(
        "title" => "CD",
        "products" => array (
            [0] => "Spice Girls Album",
            [1] => "The Beatles Album"
        ) 
    ),
   "DVD" => array(
        "title" => "DVD",
        "products" => array (
            [0] => "Snakes on a plane"
        ) 
)

Answer 2

也许你应该使用array_key_exists（）而不是in_array（）。 http://php.net/manual/en/function.array-key-exists.php

$ product ['cateogry']

上有拼写错误

Answer 3

$categories  = array();
foreach($products as $product){
    $categories[$product['category']]['title']                           = $product['category'];
    $categories[$product['category']]['products'][$product['productID']] = $product['title'];
}

print_r($categories);

Answer 4

您可以使用以下内容：

$new_products = array();
foreach ($products as $product) {
  $new_products[$product['category']][] = $product['title'];
}

这会将它们放入你想要的数组中。

Answer 5

<pre>
<?php
$p[] = array(productID => 189736,title => 'Spice Girls Album', category => 'CD', order => 0);
$p[] = array(productID => 23087, title => 'Snakes on a plane', category => 'DVD', order => 0);
$p[] = array(productID => 9874, title => 'The Beatles Album', category => 'CD', order => 1);
foreach($p as $p){
    $c[$p['category']]['title'] = $p['category'];
    $c[$p['category']]['products'][] = $p['title'];
}
print_r($c);
?>

产品数组中的类别数组

5 个答案: