Question

我的数组如下所示：

Array
(
    [0] => Array
        (
            [index] => 0
            [quantity] => 1
            [0] => Array
                (
                    [id_product] => 20
                    [title] => Oranges
                )

        )

    [1] => Array
        (
            [index] => 1
            [quantity] => 1
            [0] => Array
                (
                    [id_product] => 24
                    [title] => Bananas
                )

        )

)

要制作这个数组，这是我的代码：

$i = 0;
$content = array();
if(isset($_SESSION['cart'])){

    foreach($_SESSION['cart'] as $result){

        foreach($result as $item){

            $values = $product->getById($item['id']);

            if($values != null){ // which means it has product

                /*
                    Checks if the array already contains that ID
                    this avoids duplicated products
                */
                if(main::search_multidimensional($content, "id_product", $item['id_product']) == null){
                    $content[] = array("index" => $i, "quantity" => 1, $values);
                    $i++;
                }else{ /* 
                            in case it does have already the id_product in the array
                            I should update the "quantity" according to the "index".
                        */

                }
            }
        }
    }
}

return $content;

我的问题出在}else{之后。我一直在尝试一些代码而没有任何成功。我必须根据索引更新数量。虽然如果你们认为有更好的选择，请告诉我。

编辑：由于大多数人都担心search_multidimensional，这可能是我的解决方案，这里的功能如下：

public function search_multidimensional($array, $key, $value){
    $results = array();

    if (is_array($array)) {
        if (isset($array[$key]) && $array[$key] == $value) {
            $results[] = $array;
        }

        foreach ($array as $subarray) {
            $results = array_merge($results, self::search_multidimensional($subarray, $key, $value));
        }
    }

    return $results;
}

Answer 1

编辑2：

在这种情况下，这会有帮助吗？（因为你的search_multidimensional只返回true或false）

$i = 0;
$content = array();

if(isset($_SESSION['cart'])){
    foreach($_SESSION['cart'] as $result){
        foreach($result as $item){
            $values = $product->getById($item['id']);

            if($values != null) { // which means it has product
                /*
                    Checks if the array already contains that ID
                    this avoids duplicated products
                */
                $product_exists = false;
                foreach($content as &$cItem) {
                    if($cItem['values']['id_product'] == $item['id_product']) {
                        $cItem['values']['quantity']++; // Increments the quantity by 1

                        $product_exists = true;
                        break;
                    }
                }
                // If the product does not exist in $content, add it in.
                if(!$product_exists)
                    $content[] = array("index" => $i, "quantity" => 1, "values" => $values);

                $i++;
            }
        }
    }
}

（再次编辑给$ value的数组键）

OLD ANSWER：

~~由于您要在$content中重新创建购物车数组，您可以在其他地方执行此操作：~~

$content[] = array("index" => $i, "quantity" => $result['quantity'] + 1, $values);

这样就会显示出来：

$i = 0; $content = array(); if(isset($_SESSION['cart'])){ foreach($_SESSION['cart'] as $result){ foreach($result as $item){ $values = $product->getById($item['id']); if($values != null){ // which means it has product /* Checks if the array already contains that ID this avoids duplicated products */ if(main::search_multidimensional($content, "id_product", $item['id_product']) == null) $content[] = array("index" => $i, "quantity" => 1, $values); else $content[] = array("index" => $i, "quantity" => $result['quantity'] + 1, $values); // Retrieve current quantity and adds 1 $i++; } } } }

~~（我假设你的数量只增加1）~~

Answer 2

由于您的$content数组具有固定的结构（固定的级别数），因此您不需要使用递归函数。您的search_multidimensional功能可能会简单得多。它应该返回数组中找到的元素的索引（如果有的话）：

function search_multidimensional($array, $key, $value) {
    foreach ($array as $i => $el) {
        foreach ($el as $j => $v) {
            if (is_int($j) && isset($v[$key]) && $v[$key] == $value) return $i;
        }
    }
    return false;
}

因此，应该像这样更改代码段构建$content：

...
if (($index = search_multidimensional($content, "id_product", $item['id_product'])) === false) {
    $content[] = array("index" => $i, "quantity" => 1, $values); $i++;
}
else {
    $content[$index]['quantity']++;
}

Answer 3

<强>解决即可。我所要做的就是忘记$i变量，因为它实际上并没有做某些必要的。由于我有id_product，这是唯一的，我需要使用它。

if($values != null){ // Only if it has results

    // checks if array already contains or not the product ID

    // if does not have, it will add
    if(global_::search_multidimensional($content, "id_product", $item['id_product']) == null){
        $content[] = array("index" => $item['id_product'], "quantity" => 1, $values);
        // index is now the id of the product
    }else{

        // otherwise, loop all the elements and add +1
        foreach($content as $key => $result){
            if($item['id_product'] == $content[$key]['index']){ 
                $content[$key]['quantity']++;
            }
        }
    }
}

PHP在多维数组中更新数量

3 个答案: