如何访问数组中的此元素？

如果我做我的数组的print_r的获取：如何访问数组中的此元素？

Array ( 
    [0] => stdClass Object ( 
     [ID] => 34 
     [post_author] => 1 
     [post_date] => 2012-04-16 14:07:08 
     [post_date_gmt] => 2012-04-16 14:07:08 
     [post_content] => 
     [post_title] => visit_sfondo01 
     [post_excerpt] => 
     [post_status] => inherit 
     [comment_status] => open 
     [ping_status] => open 
     [post_password] => 
     [post_name] => visit_sfondo01-2 
     [to_ping] => 
     [pinged] => 
     [post_modified] => 2012-04-16 14:07:08 
     [post_modified_gmt] => 2012-04-16 14:07:08 
     [post_content_filtered] => 
     [post_parent] => 1 
     [guid] => http://localhost:8080/pollo_blog/wp-content/uploads/2012/04/visit_sfondo011.jpg 
     [menu_order] => 0 
     [post_type] => attachment 
     [post_mime_type] => image/jpeg 
     [comment_count] => 0 
     [filter] => raw) 
    [1] => stdClass Object ( 
     [ID] => 33 [post_author] => 1 
     [post_date] => 2012-04-16 13:53:35 
     [post_date_gmt] => 2012-04-16 13:53:35 
     [post_content] => 
     [post_title] => visit_gallery01 
     [post_excerpt] => 
     [post_status] => inherit 
     [comment_status] => open 
     [ping_status] => open 
     [post_password] => 
     [post_name] => visit_gallery01 
     [to_ping] => 
     [pinged] => 
     [post_modified] => 2012-04-16 13:53:35 
     [post_modified_gmt] => 2012-04-16 13:53:35 
     [post_content_filtered] => 
     [post_parent] => 1 
     [guid] => http://localhost:8080/pollo_blog/wp-content/uploads/2012/04/visit_gallery01.jpg 
     [menu_order] => 0 
     [post_type] => attachment 
     [post_mime_type] => image/jpeg 
     [comment_count] => 0 
     [filter] => raw) 
    )

，我想访问到[GUID]字段。与尝试：

echo $attachments[0]

或

，但我没有什么不显示（或我得到的，在第二个例子中，一个错误）。

我在哪里错了？

echo $attachments[0][guid]

来源

2012-04-16 markzzz

这是在数组中的stdClass的对象：

$attachments[0]->guid

来源

2012-04-16 14:15:16 Niko

，我可以知道有多少GUID元素存在入阵？ – markzzz 2012-04-16 14:16:35

http://stackoverflow.com/questions/1314745/php-count-an-stdclass-object – 2012-04-16 14:17:37

@markzzz如果您不能确定$ attachments数组中的每个项目都包含“guid”键，请使用简单的循环计数：'$ c = 0; foreach（$ attachments as $ a）{if（isset（$ a-> guid））{++ $ c; }}' – Niko 2012-04-16 14:25:45

如何访问数组中的此元素？

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