Query structure in laravel 5 for getting nested array result

I’m trying to make a dynamic resume. To show the skills I’ve created 3 tables as follows-

1. Skills - Contains all skill with expertise level
2. Groups - Contains category like front end, back end, database, programming etc
3. Skill_Groups - As one skill can be in multiple groups, I made this table. For example- PHP can be back end group also in programming group.

Skills

Groups

Skill_Groups

Now, I would like to display the groups and skills with nested list. Example-

• Front end

  ⁃ HTML

  ⁃ CSS

• Back End

  ⁃ PHP

  ⁃ MySQL

For this, I need a multidimensional array. What should be the query in laravel to get the result on this way?

[This question may be duplicate one, but I didn’t found. If so, please let me know, I will merge/delete it.]

Any alternate solutions also appreciable, if have.

via Chebli Mohamed