相关疑难解决方法(0)

print_r($p->attachments) 生产:

Array
(
    [0] => stdClass Object
        (
            [id] => ...
            [url] => http://...png
            [slug] => ...
            [title] => ...
            [description] => ...
            [caption] => ...
            [parent] => ...
            [mime_type] => image/png
            [images] => ...
                (
                )
        )
)

我希望访问该url字段中的值

print_r($p->attachments[0]->url) 检索网址,但也产生: Undefined offset: 0

现在我可以通过调用来抑制错误print_r(@$p->attachments[0]->url),但有没有正确的方法来解决这个问题？

我无法修改$ p对象.

编辑:

正如所建议的,这里是来自Var_dump的响应($ p->附件)

 array(1) {
  [0]=>
  object(stdClass)#322 (9) {
    ["id"]=>
    int(1814)
    ["url"]=>
    string(76) "..."
    ["slug"]=>
    string(34) "..."
    ["title"]=>
    string(34) "..."
    ["description"]=>
    string(0) ""
    ["caption"]=>
    string(53) "..."
    ["parent"]=> …