4
I'd suggest to not add layout, but MarkUp and offer an option to override it. The best way to do this would be to add to a hook that your users can add to their themes templates.
// Theme template file
do_action( 'hotel_rooms' );
// Your plugin hooks in there:
add_action( 'hotel_rooms', 'callback' );
function callback() {
echo "I am displaying details ...
2
get_the_category() retrieves the current post categories. To get all categories you should use get_categories() instead
1
get_post_format() returns the post format slug for either the current post, when used inside a loop, or a given post, when a WP_Post object or an integer post ID is passed to it as a parameter.
So, if you're using the function in a posts loop, then you can use it like this,
while ( have_posts() ) {
the_post();
if ( 'gallery' === get_post_format() ) {
...
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