How would I run add_filter only on some specific registered thumbnail sizes '$size' ? like 'large' , 'medium', etc?


The class attribute contains the size in the format attachment-$size, you could do a check for a specific size like:

if( strstr( $attr['class'], 'thumb' ) ):
    // size is attachment-thumb
  • thanks for response, but nothing happen! i think the filter is server side and this check is client
    – johnmido
    Jun 17 '12 at 17:35

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