If you want to display an author’s Gravatar, this little code should do the trick (note that it only works inside the Loop):
<?php echo get_avatar( get_the_author_meta('user_email'), 48 ); ?>
The second parameter dictates the size of the avatar. More about
I’ve been using this Tutplus tutorial to create custom post types, especially the part about creating custom post input. It works nicely, except for the fact that the meta values entered with that input can get deleted completely by WordPress when it autosaves a post. Or if you Quick Edit a post.
It seems to be a WordPress bug Fortunately, someone posted a fix on the comment area. It’s pretty self-explanatory.
There’s also a Trac ticket discussing it, there you can find a more correct fix involving the use of nonces.
In Settings > Media, you are able to set only the height or width of the Thumbnail images and WordPress will resize them proportionally (i.e.: if you have a fixed height, then the widths will vary depending on your uploaded image dimension, and vice versa).
Inside the loop, you can get a thumbnail’s width, height and URL using this code:
$imgdata = wp_get_attachment_image_src( get_post_thumbnail_id(), 'thumbnail' );
$imgurl = $imgdata; // the url of the thumbnail picture
$imgwidth = $imgdata; // thumbnail's width
$imgheight = $imgdata; // thumbnail's height
For the second parameter of the
wp_get_attachment_image_src function you can also use ‘medium’, ‘large’ and ‘full’. They correspond to the dimension for the other sizes in Settings > Media.
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