Getting a specific value out of array using get_attached_media

Question

I'm trying to write a piece of code that fetches the url/download link of any embedded audio files in the current post. In doing this I stumbled upon get_attached_media which outputted something like this (I have removed some of the values in order to keep it short):

Array (
    [172] => WP_Post Object ( 
        [ID]             => 172 
        [post_author]    => 1 
        [guid]           => http://localhost/wp-content/uploads/2013/07/03-take_me_out_128_lame_cbr_ex.mp3 
        [menu_order]     => 0 
        [post_type]      => attachment 
        [post_mime_type] => audio/mpeg 
    ) 
)

As you can tell it is all wrapped in this "WP_Post Object". Now, I'm sure this is all common place and fairly simple to resolve, but I can't figure out how. Essentially, what I want to do is to fetch the "GUID" value and attach it to a variable, as it seems to contain the URL of the post's embedded audio file.

Also, please correct my terminology so I can make this question more useful to others who migh seek an answer to this.

Answer 1

Don't use the GUID. Despite appearances, that isn't an URL. Use wp_get_attachment_image_src. Something like:

$image = wp_get_attachment_image_src($post_id,'full');
echo $image[0];

Or use wp_get_attachment_url with the post ID.

$image = wp_get_attachment_url($post_id);

Of course, I don't know what the actual variable name is that holds your images but you should see the ID in the post objects and should be able to work that out. But, for example...

$media = get_attached_media(null,1);
foreach($media as $m) {
  var_dump(wp_get_attachment_url($m->ID));
}