Set custom name for generated thumbnails

2 comments

1. Seems that the answer is no…

   I’ve followed the core functions and found a dead-end. And found this post ( How can I make add_image_size() crop from the top? ) where Rarst says:

   Intermediate image generation is extremely rigid. Image_resize() keeps it close to code and completely lacks hooks.

   But, following the lead of the other answer (from bradt) and the code he published ( Image Crop Position in WordPress ), I think I got it 🙂

   In the function bt_generate_attachment_metadata, I’ve just modified the call to bt_image_make_intermediate_size including the last parameter $size

   $resized = bt_image_make_intermediate_size( $file, $size_data['width'], $size_data['height'], $size_data['crop'], $size );
   

   And modified the beggining of the function bt_image_make_intermediate_size as follows:

   • added the $size parameter to the function
   • instead of the default null value to $suffix, a switch to our new suffixes

   function bt_image_make_intermediate_size( $file, $width, $height, $crop = false, $size ) {
       if ( $width || $height ) {
           switch($size) {
               case 'thumbnail':
                   $suffix = 't';
                   break;
               case 'medium':
                   $suffix = 'm';
                   break;
               case 'large':
                   $suffix = 'l';
                   break;
               default:
                   $suffix = null;
                   break;
           }
           $resized_file = bt_image_resize( $file, $width, $height, $crop, $suffix, null, 90 );
   

    Here , a copy of the full code with my mods, just for reference.
   And the diff from the original.

   [2021]
   I reviewed the code to fix the following warnings, (h/t @meek2100): two WP functions were deprecated and there’s a PHP 8 notice about named parameters.
   Gist with the changes annotated on code.

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2. You could use the filter image_make_intermediate_size, but you would have to figure out what name you want to change the intermediate file to, according to the $filename you get (and then rename the file, because at this point it already has been generated).

   I only generate an intermediate size image for the “thumbnail”, so it is as simple as this:

   add_filter( 'image_make_intermediate_size', function( $filename ) {
   
       // old 2017_234783843-100x100.jpg
       $old = $filename;
       // new 2017_234783843-thumbnail.jpg
       $new = preg_replace("/(d+_d+)-d+xd+.(.*)/i", "$1-thumbnail.$2", $old );
   
       rename($old, $new);
   
       return $new;
   } );
   

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