Add remove_image_size()

[Daedalon]

There have been ​numerous requests for a remove_image_size() function in WordPress. ​add_image_size() needs such a counterpart to let child themes fully define what media they support and to avoid creating unnecessary resized images.

For example the ​Elbee Elgee theme defines a 640px * 9999px image size. Our child theme doesn't use this size anywhere. However, as long as that image size if defined, an image of that size will be generated for each larger image that is uploaded.

Without remove_image_size() it's not possible to avoid generating those unnecessary images in an update-safe way.

[markoheijnen]

It makes totally sense to have something like this. Added a patch. Not sure if there should be a message when it's called to late.

[Daedalon]

Thanks, Marko! Tested in 3.8. Works like a charm. It's now possible to remove and/or redefine image sizes upon init:

function my_custom_image_sizes( ) {
	remove_image_size( 'theme-image-size' ); // Removing default size
	add_image_size( 'theme-image-size', 400, 300 ); // Re-adding with a custom size
}
add_action( 'init', 'my_custom_image_sizes' );

[mordauk]

Works perfectly for me.

[nacin]

Maybe some basic unit tests? :-)

[markoheijnen]

Curious if we also should add has_image_size() then ;)

[mordauk]

Replying to markoheijnen:

Curious if we also should add has_image_size() then ;)

I've wanted to have that a few times. I'll write up a quick patch and new ticket.

[mordauk]

#26951 related for has_image_size()

[mordauk]

Adds unit tests for add_image_size(), has_image_size(), and remove_image_size()

[nacin]

Looks great. I'll get this in.

[nacin]

In 27129:

Add remove_image_size() and tests for it and has_image_size(), added in [27128].

props mordauk, markoheijnen.
fixes #26768. see #26951.