How do you write a nested loop of laravel?

Laravel nested loops How to write, similar to the output provinces and cities level two menu, the data table is separate, two tables. The main is inside that cycle do not know how to write, write the operation can not.

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Laravel nested loops How to write, similar to the output provinces and cities level two menu, the data table is separate, two tables. The main is inside that cycle do not know how to write, write the operation can not.

It is recommended that you use the SQL statement join or Leftjoin merge table to complete this function

Are you talking about the time of the output? Or when you're querying the data?

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