wp-includes/post-formats.php:17Retrieve the format slug for a post
$postint|WP_Post|nulloptionalnullstring|falsefunction get_post_format( $post = null ) { $post = get_post( $post ); if ( ! $post ) { return false; } if ( ! post_type_supports( $post->post_type, 'post-formats' ) ) { return false; } $_format = get_the_terms( $post->ID, 'post_format' ); if ( empty( $_format ) ) { return false; } $format = reset( $_format ); return str_replace( 'post-format-', '', $format->slug );}Introduced in 3.1.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/post-formats.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.