Ok, so I’m feeling generous and will add another answer 🙂

This code will run every time a post is created or updated, and it will add a term to your teacher taxonomy with a name that is the same as the post title.

add_action('save_post', 'my_create_teacher_term_from_post');
function my_project_updated_send_email($post_id){

    /** Ensure that this is not a revision */
    if(wp_is_post_revision($post_id))
        return;
    
    /** Get the name of the teacher that has been added/updated */
    $post_title = get_the_title(post_id);
    
    /** Check to see if a term with the same name as the teacher exists... */
    if(!term_exists($post_title, 'teacher')) :  // It does not...
    
        /** Insert the new term */
        wp_insert_term($post_title, 'teacher');
        
    endif;
    
}

Note – If you only want this action to occur when a post is created, not updated, replace the save_post hook with wp_insert_post.

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Additional reading

• WordPress action hooks – http://codex.wordpress.org/Plugin_API/Action_Reference

  These will be essential to you going forward, and I fully encourage you to root through the core to see which hooks are available – just be careful!

• The save_post action hook – http://codex.wordpress.org/Plugin_API/Action_Reference/save_post

  Used in the example above, this hook is called everytime a post is created/updated.

• The wp_insert_post action hook – http://codex.wordpress.org/Plugin_API/Action_Reference/wp_insert_post

  You can use this hook instead if you wish, it’s only called when a post is updated though, not created. And should you ever need to use both this hook and the save_post hook, note that this one is called after save_post.

• The term_exists function – http://codex.wordpress.org/Function_Reference/term_exists

  This is how you’ll see if a term with a name that matches the title of the teacher you’ve just added already exists.

• The wp_insert_term function – http://codex.wordpress.org/Function_Reference/wp_insert_term

  Finally this is how you acutally create a term progamatically.