【CodeBase】通过层级键在多维数组中获取目标值

通过层级键在多维数组中获取目标值

/*
*Author : @YunGaZeon
*Date : 2017.08.09
*param data : Data Array
*param keys : Key level Array
*return : Array
*/
function findbykeys($data,$keys,$_index=0,&$_target_arr=[])
{
    if($_index>(count($keys)-1))
        return $_target_arr;

    foreach($data as $k=>$v)
    {
        if($k===$keys[$_index])
        {
            if($_index==(count($keys)-1))
                $_target_arr[]=$v;
            else
            {
                if(is_array($v))
                    findbykeys($v,$keys,++$_index,$_target_arr);
            }
        }
        else
        {
            if(is_array($v))
                findbykeys($v,$keys,$_index,$_target_arr);
        }
    }
    return $_target_arr;
}

使用：获取京东某页评价中的所有图片链接

$data=file_get_contents('https://club.jd.com/comment/productPageComments.action?callback=fetchJSON_comment&productId=5045080&score=0&sortType=5&page=1&pageSize=10&isShadowSku=0&rid=0&fold=1');
$data=iconv('GBK', 'UTF-8//TRANSLIT//IGNORE', $data);
preg_match('/^[^(]+(([sS]+));$/',$data,$data);
$data=$data[1];
$cm=json_decode($data,true);
$keys=['comments','images','imgUrl'];
var_dump(findbykeys($cm,$keys));