Set default image sizes in WordPress to hard crop

Question

How do I set the medium and large images sizes in WP to hard crop?

In my theme I can set the thumbnail size to hard crop using this:

add_theme_support('post-thumbnails');
set_post_thumbnail_size( 96, 96, true );

But I can see no way to make the medium and large images to hard crop.

Is there possibly a way to remove the medium and large sizes and re-add them using:

add_image_size( 'medium', $width, $height, true );
add_image_size( 'large', $width, $height, true );

Answer 1

You can over write the default like this:

add_image_size( 'medium', 200, 200, true );

Answer 2

Here's an improvement that uses the settings as you tried to do:

add_image_size('medium', get_option( 'medium_size_w' ), get_option( 'medium_size_h' ), true );

Answer 3

To enable cropping for the medium images, it is enough to use this code:

update_option( 'medium_crop', 1 );

The update_option() function itself checks whether such an option exists, and adds it if necessary:

If the option does not exist, then the option will be added with the option value, with an $autoload value of yes.

Answer 4

The Gleb's answer worked nicely for me.

// Medium Size Thumbnail
if(false === get_option('medium_crop')) {
    add_option('medium_crop', '1'); 
} else {
    update_option('medium_crop', '1');
}

Found the full code here