the_post_thumbnail_caption

Filter Hook: Filters the displayed post thumbnail caption.

Source: wp-includes/post-thumbnail-template.php:252

the_post_thumbnail_url()

Function: Display the post thumbnail URL.

Source: wp-includes/post-thumbnail-template.php:207

the_post_thumbnail()

Function: Display the post thumbnail.

Source: wp-includes/post-thumbnail-template.php:61

post_thumbnail_size

Filter Hook: Filters the post thumbnail size.

Source: wp-includes/post-thumbnail-template.php:129

post_thumbnail_html

Filter Hook: Filters the post thumbnail HTML.

Source: wp-includes/post-thumbnail-template.php:177

has_post_thumbnail()

Function: Check if post has an image attached.

Source: wp-includes/post-thumbnail-template.php:21