For more information about the frontend and backend, please help and wait online-php Tutorial

For more information about the front and back ends, please help and modify the calendar program online. Requirement: place the array storing special holidays in the background and store information (or more complex array) in the key-value array ). The foreground transmits the date to the background for receiving, determining, and returning. Frontend and backend communication must be in JSON format.
I really don't understand

Reply to discussion (solution)

Very ??.
There are backend ??? Table ,?? Special Date, key => value ??,
Because? Is a special date, key ?? Is the date, value ?? Yes? What is the date ?? .
For example

$ Arr = array ('01-01 '=> 'New Year', '02-14' => 'lover? ', '03-08' => '? Female? ');

Front-end ,? Input date, and then Root? Is the return date special? . Frontend and backend access? Json format.

Front-end proxy? :