我们可以在不使用工具的情况下在PHP类中实现接口

Question

I mean can we directly use interface class inside main class as a constructor.

Answer 1

No, you can't instantiate an Interface in PHP.

<?php

interface TestError {
    public function test() {
        print "Bye!"; // Fatal error: Interface function Test::test() cannot contain body
    }
}

interface Test {
    public function test();
}

class Main {
    public function __construct () {
        $test = new Test(); // Fatal error: Cannot instantiate interface
    }
}

$main = new Main();

?>