These are included in wp-settings.php right after after_setup_theme hook and so should be available starting with init hook. Also check if you have add_theme_support( ‘post-thumbnails’ ); declared in your theme, otherwise these functions won’t be included at all.
You need to call it in your theme. open your theme index.php or better if you have loop.php and inside the loop add <?php if ( has_post_thumbnail() ) { // check if the post has a Post Thumbnail assigned to it. the_post_thumbnail(); } ?> Hope This helps.
You cant without editing core files but you can name it any way you want so you can call it from you plugin: if ( function_exists( ‘add_image_size’ ) ) { add_image_size( ‘my-plugin-thumb’, 220, 180, true ); } and call it if ( has_post_thumbnail() ) { the_post_thumbnail( ‘my-plugin-thumb’ ); } it’s not perfect but its something.
use this plugin instead. Always work for me 🙂 http://wordpress.org/extend/plugins/regenerate-thumbnails
if i understand your question correctly then have a go with Justin Tadlocks get the image plugin, olden but golden and does the default image per category etc.
Checkout this plugin i developed for use in my theme. http://swiftthemes.com/swiftdynamicthumbs-plugin-to-generate-thumbnails-dynamically-when-needed/
When you link to an external image, WordPress will reference the external URL. media_handle_upload is meant to handle uploaded images that are now living on your server. So unless you’re telling the server to download the image from the external source and save it on your server, media_handle_upload won’t apply. It sounds like you’re building … Read more
It turns out WP got confused because i used the settings> medias screen to also set the “medium” dimensions to 670×290. This redundance seems to disable entirely both the “medium” and the “listing-post-thumbnail” dimensions. Replacing the medium dimension values to 0 and then regenerating the thumbnails solved the issue. Thanks to those who tried to … Read more
This is your theme specific to show featured image in single post view. I think you’re using Modern Style theme, just remove following code from single.php on line 14, now featured images only will be shown on tag/category archive pages (and I think on main page too ). <?php if ( function_exists(“has_post_thumbnail”) && has_post_thumbnail() ) … Read more
Is it possible to add thumbnails to blog post listings independent of images in a blog post set the ‘featured image’ when writing/editing your post; and use the_post_thumbnail() within the loop, in the template. e.g. if there is no image in the blog post, can I add a thumbnail image? dependent on a post image, … Read more