PHP 유형 힌트로 boolean을 지정하지만 boolean을 지정해야 합니다

문제 코드

<?php
class Main{
    public function type_hint_boolean(boolean $arg){
        var_dump($arg);
    }

    public function type_hint_integer(integer $arg){
        var_dump($arg);
    }
}

$main = new Main();
$main->type_hint_boolean(true);
$main->type_hint_integer(1);

PHP Fatal error:  Uncaught TypeError: Argument 1 passed to Main::type_hint_boolean() must be an instance of boolean, boolean given,

must be an instance of integer, integer given

답안

<?php
class Main{
    public function type_hint_bool(bool $arg){
        var_dump($arg);
    }

    public function type_hint_int(int $arg){
        var_dump($arg);
    }
}

$main = new Main();
$main->type_hint_bool(true);
$main->type_hint_int(1);

bool(true)
int(1)

해설

<?php
class Main{
    public function type_hint_boolean(boolean $arg){
        var_dump($arg);
    }
    public function type_hint_integer(integer $arg){
        var_dump($arg);
    }
}

class boolean{
}
class integer{
}

$main = new Main();
$main->type_hint_boolean(new boolean());
$main->type_hint_integer(new integer());

object(boolean)#2 (0) {
}
object(integer)#2 (0) {
}

참고 자료