​The `get_post_mime_types()` function retrieves the default post mime types in WordPress

Retrieves the image srcs from galleries from a post’s content, if present.

Retrieves the mime type of an attachment based on the ID.

​The `get_post_meta_by_id()` function in WordPress is used to retrieve post meta data by its meta ID

Checks a post’s content for galleries and return the image srcs for the first found gallery.

Checks a specified post’s content for gallery and, if present, return the first

​The `get_post_galleries()` function in WordPress is used to retrieve galleries from a post's content

Returns an array of post format slugs to their translated and pretty display versions

​The `get_post_format()` function in WordPress retrieves the format slug for a post using the `$post` parameter