PHP library for efficient routing

<?php
namespace FastRoute;
use PHPUnit\Framework\TestCase;
class RouteCollectorTest extends TestCase {
    public function testShortcuts() {
        $r = new DummyRouteCollector();
        $r->delete('/delete', 'delete');
        $r->get('/get', 'get');
        $r->head('/head', 'head');
        $r->patch('/patch', 'patch');
        $r->post('/post', 'post');
        $r->put('/put', 'put');
        $expected = [
            ['DELETE', '/delete', 'delete'],
            ['GET', '/get', 'get'],
            ['HEAD', '/head', 'head'],
            ['PATCH', '/patch', 'patch'],
            ['POST', '/post', 'post'],
            ['PUT', '/put', 'put'],
        ];
        $this->assertSame($expected, $r->routes);
    }

Routing refers to the network-wide process of determining the end-to-end path when a packet travels from source to destination [1]. Routing works on the third layer of the OSI reference model - the packet forwarding device of the network layer. Routers implement network interconnection by forwarding data packets. Although routers can support multiple protocols (such as TCP/IP, IPX/SPX, AppleTalk, etc.), the vast majority of routers in our country run the TCP/IP protocol. Routers usually connect two or more logical ports identified by IP subnets or point-to-point protocols, and have at least 1 physical port. The router determines the output port and next hop address based on the network layer address in the received data packet and the routing table maintained internally by the router, and rewrites the link layer data packet header to forward the data packet. Routers maintain routing tables by dynamically maintaining routing tables to reflect the current network topology and by exchanging routing and link information with other routers on the network.

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