php8新增函数

<?php
//纯枚举pure enum，没有绑定具体值，每个case就是唯一实例
enum Suit{
    case H;
    case D;
    case C;
    case S;
}
// echo Suit::H;
//$suit = Suit::cases();
//$val = Suit::D;
//print_r($val);
// echo $val instanceof Suit;
function getStatusColor(Suit $suit): string {
    return match($suit) {
        Suit::H => 'orange',
        Suit::D => 'blue',
        Suit::C => 'green',
        Suit::S => 'red'
    };
}
$a= getStatusColor(Suit::C);
print_r($a);

enum Color {
    case PENDING;
    case PROCESSING;
    case SHIPPED;

    function getColor(): string {
        return match($this) {
            self::PENDING => '橙色',
            self::PROCESSING => '蓝色',
            self::SHIPPED => '绿色'
        };
    }
}

echo Color::PENDING->getColor(); // 输出：橙色
function aa (int $a) {}


echo "<br/>";

//回溯枚举backend enum带有标量值的枚举，可以关联字符串或整数
enum Status: string {
    case PENDING = 'pending';
    case ACTIVE = 'active';
}
$sq = Status::ACTIVE;
print_r($sq);
echo $sq->name."=".$sq->value;