在PHP for循环中插入多维数组

Question

下面是我的数组结构

Array
(
[0] => Array
    (
        [product_id] => 59
        [product_name] => Samsung Champ DUOS E2652 
        [product_price] => 4439
        [sub_cat_name] => Samsung
        [sub_cat_url] => samsung
        [image] => samsung-champ-duos-e2652---1414801404364308.jpg
        [currency] => ₹
    )
[1] => Array
    (
        [product_id] => 195
        [product_name] => Samsung Galaxy Tab 4 7.0
        [product_price] => 17847
        [sub_cat_name] => Samsung
        [sub_cat_url] => samsung
        [image] => galaxy-tab-4-7-0---1715601405057269.png
        [currency] => ₹
    )
[2] => Array
    (
        [product_id] => 284
        [product_name] => Samsung Galaxy Tab 3 Lite 7.0
        [product_price] => 18000
        [sub_cat_name] => Samsung
        [sub_cat_url] => samsung
        [image] => galaxy-tab-3-lite-7-0---1590061405576878.png
        [currency] => ₹
    )
[3] => Array
    (
        [product_id] => 19
        [product_name] => Samsung Galaxy Star
        [product_price] => 4833
        [sub_cat_name] => Samsung
        [sub_cat_url] => samsung
        [image] => feature-img144811404109906.jpg
        [currency] => ₹
    )
[4] => Array
    (
        [product_id] => 186
        [product_name] => Samsung Galaxy S5 Active
        [product_price] => 31922
        [sub_cat_name] => Samsung
        [sub_cat_url] => samsung
        [image] => galaxy-s5-active368091404989896.png
        [currency] => ₹
    )
)

我想排序这个数组基于sub_cat_url如下

array
(
[0] => samsung
   [0] => Array
    (
        [product_id] => 186
        [product_name] => Samsung Galaxy S5 Active
        [product_price] => 31922
        [sub_cat_name] => Samsung
        [sub_cat_url] => samsung
        [image] => galaxy-s5-active368091404989896.png
        [currency] => ₹
    )
    [1] => Array
    (
        [product_id] => 284
        [product_name] => Samsung Galaxy Tab 3 Lite 7.0
        [product_price] => 18000
        [sub_cat_name] => Samsung
        [sub_cat_url] => samsung
        [image] => galaxy-tab-3-lite-7-0---1590061405576878.png
        [currency] => ₹
    )
)

为此，我编写了如下代码:

for($i = 0; $i < $count; $i++){
            if($i == 0){
                $search_array[$i] = $search_data[$i]["sub_cat_name"];
                $search_array[$i] = $search_data[$i]["product_name"];
                $j += 1;
            }
            else if($search_data[$i]["sub_cat_url"] !== $search_data[$i]["sub_cat_url"]){
                $search_array[$i] = array($search_data[$i]["sub_cat_name"]);
                $search_array[$i] = array($search_data[$i]["product_name"]);
                $j += 1;
            }
            else if($search_data[$i]["sub_cat_url"] === $search_data[$i]["sub_cat_url"]){
                $search_array[$i] = array($search_data[$i]["product_name"]);
                $j += 1;
            }
        }

但效果不佳。我也试过使用内部for循环。它也没有给我实际的结果。有人能帮我写一个正确的循环语句吗?提前谢谢大家

Answer 1

如果我没理解错的话，这应该行得通:

$out = array();
$map = array();
foreach ($array as $k => $v) {
   $url = $v['sub_cat_url'];
   if (!isset($map[$url])) {
     $map[$url] = count($out);
   }
   $out[$map[$url]][$url][$k] = $v; // or $out[$map[$url]][$url][] = $v;
}

但是我还没有测试过(你还没有提供PHP格式的数据)