[wp-trac] [WordPress Trac] #16830: url_to_postid() doesn't resolve attachments when rewrite rules are disabled

[WordPress Trac]

#16830: url_to_postid() doesn't resolve attachments when rewrite rules are disabled
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 Reporter:  Coolkevman       |       Owner:
     Type:  feature request  |      Status:  reopened
 Priority:  normal           |   Milestone:  Awaiting Review
Component:  Rewrite Rules    |     Version:  1.2
 Severity:  normal           |  Resolution:
 Keywords:  needs-patch      |
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Comment (by c3mdigital):

 Replying to [comment:6 MikeSchinkel]:
 > Replying to [comment:5 c3mdigital]:
 > > I can't think of a use case for needing the attachment_id when you
 have the full url to the actual image, maybe to get the attachment meta
 data?  I'm closing but if anyone has a use case that I'm missing please
 reopen.
 >
 > One reason you mention is attachment meta data.
 >
 > Further, most ''(all?)'' of the `wp_get_attachment()` functions expect
 an attachment post ID, so I can very much see how this would be useful for
 more advanced WordPress development, for example to parse URLs out of user
 entered content to match up with attachments or to parse the URL out of a
 feed for a site that has its database on the same MySQL server as the site
 with running, and to determine it's ID in the other site's database.
 >
 > ''(We are doing both of these on my current project.)''
 >
 > However, the implementation of this function needs to be more complex
 than to just check against the `guid` because that can fail.

 After thinking about this more I agree.  I also agree that using guid is
 not a good idea.  I've come up with a patch that works nicely and will get
 the post or attachment ID of any attachment image.

 The basic premise is checking if the url has an image extension then
 parsing it and extracting the string that would be save in postmeta as
 `_wp_attached_file` It also checks if it is a resized image and slices out
 the width x height bits.

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Ticket URL: <http://core.trac.wordpress.org/ticket/16830#comment:9>
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