PHP: Create Wordpress Post Custom Meta Boxes

Post meta boxes are draggable boxes on the post screen which content different inputs to attach to the post. WordPress already comes with loads of post meta boxes and you will be familiar with most of them. The publish meta box allows you to change the publish settings on the current post or schedule it for the future. The category meta box allows you to choose a taxonomy for the current post. There is a tags meta box to add additional tags to the post.