WordPress at a glance
filter is not described

post_mime_types filter-hook . WP 2.5.0

Filters the default list of post mime types.

Usage

add_filter( 'post_mime_types', 'filter_function_name_8440' );
function filter_function_name_8440( $post_mime_types ){
	// filter...

	return $post_mime_types;
}
$post_mime_types(array)
Default list of post mime types.

Where the hook is called

get_post_mime_types()
wp-includes/post.php 2489
return apply_filters( 'post_mime_types', $post_mime_types );

Where the hook is used (in WP core)

Does not used.