$country = $object?->user?->getRule();

//オプショナルチェーン (optional chaining) 演算子 (?.)👍
let email = data?.email;

import java.util.Arrays;
import java.util.Scanner;
import java.util.function.BiFunction;
import java.util.function.Consumer;
public class Ox {
    public static void main(String[] args) {
        String [][] ox_list = new String[3][3];
        int x_max = 3,y_max = 3;
        BiFunction<Integer,Integer,Boolean> md = (x,y)->{
            Scanner kigo = new Scanner(System.in);
            System.out.printf("縦%d 横%d 番目の記号を入力してください{o,x}\n",y,x);
            ox_list[y][x] = kigo.next();
            return ((ox_list[y][x].equals("x") || ox_list[y][x].equals("o"))?true:false);
        };
        Consumer<String> Oxview = (s)->{
            System.out.println(s);
            String str = "";
            for (int i = 0; i < y_max; i++) {
                for (int ii = 0; ii < x_max; ii++) {
                    str+=  "|" + ox_list[i][ii] ;
                }
                str+= "|\n";
            }
            System.out.println(str);
        };
        for (int i = 0; i < y_max; i++) {
            for (int ii = 0; ii < x_max; ii++) {
                if(!md.apply(ii,i)){
                    System.out.println("入力が不正です");
                    ii = (ii-1)>=0?(ii-1):-1;
                }
                Oxview.accept("入力中");
            }
        }
        Oxview.accept("最終結果");
    }
}

<?php
class testA{
    public $a = "";
    public function __construct($a)
    {
        $this->a = $a;
    }
    public function test1($a=""):string{
        return (string)$this->a." ".$a."<br>\n";
    }
    public function test2($a=""):string{
        return (string)$this->a." ".$a."<br>\n";
    }
}
class test{
    public function main($a="Hello"):object
    {
        $this->a = $a;
        return new testA($this->a);
    }
}
$test = new test();
print $test->main()->test1("PHP");
print $test->main("by")->test2("C");

<?php
    class test{
        function main(){
            return new class{
                function testA(){
                    return "testA";
                }
                function testB(){
                    return "testB";
                }
            };
        }
    }
    $test = new test();
    print $test->main()->testA();
    print $test->main()->testB();