Enhancements: add_post_thumbnail_image_size / wp_get_attachment_id

[torben.tschechne@…]

Hello,
I hope I am in the right place here to suggest two enhancements for WP core.

1:
From my perspective the most used image of a post is the post-thumbnail. I use this post thumbnail quite often in different sizes - for teasers, related posts, sliders etc. From a performance perspective I always want to deliver the image in the correct dimensions. No 1600px image in a related post section where the image is 200px wide etc. I am struggling a bit because I often work on websites which have a lot of pictures in their posts. When I add a new image size its always relevant for all images which are uploaded to WP and often they are not necessary. I do not need a 200px wide image of 20 images which are used in the post - I only need it for the post-thumbnail. From that perspective I would like to have another function than add_image_size - for example: add_post_thumbnail_image_size which is only triggered when somebody selected an image as the post-thumbnail. This will save space on the servers as well.

2:
Sometimes I have the case that I need the attachment ID of an url that has been uploaded. For example: I delevoped a plugin where an image can be chosen, the input field is a text field for a URL. In that case I need to determine the attachment ID to have access to all the necessary WP functions. In this case I built my own function that does it, but I think it will also be a function that can be helpful if it is integrated in WP.

Looking forward to your reply.

In order to always get the image in the correct dimensions which are

[swissspidy]

I do not need a 200px wide image of 20 images which are used in the post - I only need it for the post-thumbnail. From that perspective I would like to have another function than add_image_size - for example: add_post_thumbnail_image_size which is only triggered when somebody selected an image as the post-thumbnail. This will save space on the servers as well.

See #13372 (kind of) and ​http://wordpress.stackexchange.com/questions/108572/set-post-thumbnail-size-vs-add-image-size/ for a workaround.

Sometimes I have the case that I need the attachment ID of an url that has been uploaded. For example: I delevoped a plugin where an image can be chosen, the input field is a text field for a URL. In that case I need to determine the attachment ID to have access to all the necessary WP functions.

See attachment_url_to_postid() and #16830