How to get the category ID of the current post? Just copy the codes below and paste it into your .php file.
$category = get_the_category( get_the_ID() ); $category_ID = $category[0]->term_id;
Another problem is, what if the category ID is a sub category and you need the parent category ID? For Example, the current category ID is 2 and this is a sub category of 1 ( which is 1 is the category you are looking ), then you need codes below.
$category = get_the_category( get_the_ID() );
$category_ID = $category[0]->term_id;
$parent_id = get_ancestors( $category_ID, 'category' );
if( in_array( 1, $parent_id ) ){
// codes if true
}
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