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
我试图弄清楚将其转换为如下所示的类别数组的逻辑：
$categories = array(
[0] => array(
"title" => "CD",
"products" => array (
[0] => "Spice Girls Album",
[1] => "The Beatles Album"
)
),
[1] => array(
"title" => "DVD",
"products" => array (
[0] => "Snakes on a plane"
)
)
因此，对于每种产品，我都有：
if (!in_array($product['cateogry'], $categories)){
$categories[] = $product['cateogry'];
$categories[$product['category']][] = $product;
} else {
$categories[$product['category']][];
}
但这不起作用，因为我认为in_array对类别数组的检查不够深入。有没有人对解决此问题的最佳方法有任何建议？非常感谢
你对$categories[$product['category']][] = $product有正确的想法。您需要检查的是密钥$product['category']是否存在于$categories：
if (array_key_exists($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)
);
}
这将为您提供一个格式为：
$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"
)
)
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["分类"]上有错别字
$categories = array();
foreach($products as $product){
$categories[$product['category']]['title'] = $product['category'];
$categories[$product['category']]['products'][$product['productID']] = $product['title'];
}
print_r($categories);
你可以使用这样的东西：
$new_products = array();
foreach ($products as $product) {
$new_products[$product['category']][] = $product['title'];
}
这会将它们放入您想要的数组中。
<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);
?>