Question

我需要获取整个类别树层次结构（ebay API）并打印每个类别值而不使用任何数据库（即mysql）。我尝试了几种使用foreach的方法，但是我的脚本在顶级类别之后死亡，或者最多在第一组子类别之后死亡。

这是我的剧本：

set_time_limit('0'); 
error_reporting(E_ALL);
## get categories allow us to traverse through categories

//getcategorycall  call to return the categories based on the category id
function GetCategoryInfo($id) {
    $URL = "api.example.com";
    $response = json_decode(file_get_contents($URL), true);
    //check if the request is returned with success
    $Ack = $response['Ack'];
    if ($Ack !== 'Success') {
        echo "error $Ack";
        exit();
    }
    //get category array
    $CategoryArray = $response['CategoryArray']['Category'];
    return $CategoryArray;
}

$CategoryID_top = '-1';
$CategoryInfo = GetCategoryInfo($CategoryID);

//traverse top categories
//we need to count the categories and start from 1 due the fact the requested category(e.g. root) is included in the response
$top_count = count($CategoryInfo);
$top_i = 1;
while ($top_i <= $top_count) {
    $Category = $CategoryInfo[$top_i];
    #   print_r($Category);
    #   exit();
    $CategoryID = $Category['CategoryID'];
    $CategoryName = $Category['CategoryName'];
    $LeafCategory = $Category['LeafCategory'];
    echo " Top category:: $CategoryID\n $CategoryName\n $LeafCategory\n<br>";

    //traverse child categories that are not leaf until it reaches the leaf categories
    if (empty($LeafCategory)) {
        echo "this is not a leaf category";
        $CategoryInfo = GetCategoryInfo($CategoryID);

        $child_count = count($CategoryInfo);
        $child_i = 1;
        while ($child_i <= $child_count) {
            $Category = $CategoryInfo[$child_i];
            $CategoryID = $Category['CategoryID'];
            $CategoryName = $Category['CategoryName'];
            $LeafCategory = $Category['LeafCategory'];
            echo " Child category :: $CategoryID\n $CategoryName\n $LeafCategory\n<br>";
            $child_i++;
        }
    }
    $top_i++;
}

Answer 1

据我所知，你不应该在你的内循环中替换$ CategoryInfo变量（而是选择一个不同的名称），因为它可能搞砸了。
您可能需要获取太多数据，这将花费很长时间并导致脚本停止在预定义的限制。使用set_time_limit()函数将限制设置为更高的值（例如几分钟）。

另外，为简化起见，请使用以下代码：

$top_count = count($CategoryInfo);
$top_i = 1;
while ($top_i <= $top_count) {
    $Category = $CategoryInfo[$top_i];
    ...
    $top_i++;
 }

可以替换为：

foreach ($CategoryInfo as $Category) {
    ...
}

PHP foreach / while / loop - 如何在没有数据库的情况下遍历整个类别层次结构

1 个答案: