WP_Route.php

<?php

WP_Route::get('/',                                function(){
  return "Hello World."
});

WP_Route::get('/flights',                        'flights'); // flights()
WP_Route::post('/flights/{flight}',              'singleFlight'); // singleFlight($flight)
WP_Route::put('/flights/{flight}/book/{date}',   'bookFlight');
WP_Route::delete('/flights/{flight}/delete',     'deleteFlight');

WP_Route::any('/flights/{flight}',               'Class@staticMethod');
WP_Route::any('/flights/{flight}',               array('Class', 'staticMethod'));
WP_Route::patch('/flights/{flight}',             array($object, 'method'));
WP_Route::match(['get', 'post'],                 'flights/{flight}/confirm', 'confirmFlight');
WP_Route::redirect('/from/here',                  '/to/here', 301);