从Angular 6发送JSON并在PHP休息服务中接收？

Question

I have an Angular6 app and I want to send a JSON to the REST api in PHP, then get all the fields to make a insert query.

This is my function in angular:

createUser(user: User) {
        const jsonParms = JSON.stringify(user);
        this.http.post('http://localhost:80/angular/newUser.php', jsonParms).pipe(map(data => {
            console.log(data.json());
            return data.json();
        })).subscribe();
    }

How do I have to recive the JSON in php and extract the fields to make an insert in mysql?