Working with set_post_thumbnail_size and add_image_size
Today, I would like to post about these two handy functions introduced in WordPress v2.9, these two functions are used to integrate and work with the wordpress post thumbnails features, which was also introduced in wordpress v2.9.
I have been seeing people say that these functions are not working in their theme as they should. But i would like to point out some things that might help you with that and at the same time help you understand what the difference in these two functions are.
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