Trying to set up a php server, To-Dolist app with typescript. help please

Question

Can someone explain to me what the code below is doing or how I'm supposed to use it.
As I understand it, its like making an own server.
Its for a school project, Im trying to build a To-Dolist with Typescript.
<?php
/*
service.php
*/
date_default_timezone_set("Europe/Stockholm");
define('DB_HOST', 'localhost');
define('DB_NAME', 'todo');
define('DB_USER', 'root');
define('DB_PASS', 'segdeg');
require_once "db.inc";
require_once "todo.inc";
//require_once "DBBase.class";
$method = $_SERVER['REQUEST_METHOD'];
if ($method == 'POST') {
$json = file_get_contents('php://input');
$data = json_decode($json);
$todoObj = new Todo(DB_HOST, DB_NAME, DB_USER, DB_PASS);
if ($data->_action == "GetList") {
$result = $todoObj->GetList();
print_r($result);
}
else if ($data->_action == "Get") {
$result = $todoObj->Get($data);
print_r($result);
}
else if ($data->_action == "Insert") {
$result = $todoObj->Insert($data);
print_r($result);
}
else if ($data->_action == "Update") {
$result = $todoObj->Update($data);
print_r($result);
} else {
die("wrong call");
}
/*
$class = $data->_group . 'Class';
require_once 'class/' . $data->_group . '.class';
$api = new $class(DB_SECURITY_HOST, DB_SECURITY_NAME, DB_SECURITY_USER, DB_SECURITY_PASS, $text);
echo $api->Run($data);
*/
}
else {
die('NOT ALLOWED METHOD: ' . $method );
}
?>

Answer 1

its connecting to a database. then it checks to see if any posted data exists. it expects the posted data to be in JSON format, including a property called _action. it seems like action can be one of a few values insert, update, get. and then it runs the action. in order to run this you would need something to post the JSON. for just testing you could use a tool named Postman. but for making something worthwhile you would need a frontend . maybe some javascript ajax calls or Php curl calls. it just depends on what you want.

Answer 2

John Anderson Thanks, I think I get it.