Remove WordPress full size images from being inserted into a post + option to and add max size to to prevent users from inserting massive images.

image_optimize-wordpress.php

<?php

/**
 * 
 * This removes the ability to add the FULL image size into a post, it does not alter or delete the image
 * Add whataever extra image sizes to the insert dropdown in WordPress you create via add_image_size
 * 
 *  For now we have to do it this way to make the labels translatable, see trac ref below.
 *
 *  If your theme has $content_width GLOBAL make sure and remove it
*/

//example to add post-size instead of using $content_width and a max-size
add_image_size( 'post-size', 600, 9999);
add_image_size( 'max-size', 1600, 900, true);

// over-ride image_size_names_choose
function add_image_insert_override($size_names){
 
  global $_wp_additional_image_sizes;
 
       //default array with hardcoded values for add_image_size
        $size_names = array(
                          'thumbnail' => __('Thumbnail'), 
                          'medium'    => __('Medium'), 
                          'large'     => __('Large'),
                          'post-size' => __('Post Size'),
                          'max-size'  => __('Max Size')
                          //'full'      => __('Full Size') bye bye
                        );
 
      return $size_names;
 
};
 
add_filter('image_size_names_choose', 'add_image_insert_override' );


// For referance
//http://core.trac.wordpress.org/ticket/20663, http://core.trac.wordpress.org/ticket/19990

?>

Thank you! You have saved my day.

I needed to limit sizes of images to forbid inserting too big ones in posts, because apple devices dont load images that are too big on webpages.

I have also added:

update_option('medium_size_h', 1024);
update_option('large_size_h', 1600);

function sgr_filter_image_sizes( $sizes) {

unset( $sizes['thumbnail']);
unset( $sizes['medium']);
unset( $sizes['large']);

return $sizes;

}
add_filter('intermediate_image_sizes_advanced', 'sgr_filter_image_sizes');