How to get term ID

This is the thing I want to do, PLEASE HELP ME!

I have a post-type name “Program” and “Curse” and both have a hierarchical configuration for a taxonomy named “Ubication”, it has something like this:

Guatemala
-Guatemala City
-Mixco
Sacatepequez
-Antigua Guatemala
-San Bartolomé

I want a select field with the main tax terms i.e.(Guatemala and Sacatepequez)I got it with get_terms();

Now I want to concatenate this main terms with their respective children, for example, if I choose “Guatemala”, the second select will be auto-populate with Guatemala’s children terms (Guatemala City, Mixco). So the deal is that I can’t show the children terms.

I’m trying to use get_term_children(), but I don’t know how to use it and how to get the term ID.

Please help me! ??

see this if help https://chinmoy29.wordpress.com/2010/07/02/creating-a-custom-taxonomy/#comment-24

@chinmoy29 almost but I don’t get any result,I use $term = get_term_by( 'slug', get_query_var( 'ingenieria' ), get_query_var( 'area' ) ); print_r($term);

Any other suggestion?

$term = get_term_by( 'slug', get_query_var( 'ingenieria' ), get_query_var( 'area' ) ); print_r($term);

Your code is wrong. try this

$term = get_term_by( 'slug', get_query_var( 'term' ), get_query_var( 'texonomy' ) );
print_r($term);

Now you will get the result.

Just a small typo to fix (“taxonomy” instead of “texonomy”):

$term = get_term_by( ‘slug’, get_query_var( ‘term’ ), get_query_var( ‘taxonomy’ ) ); print_r($term);