UnhandledMatchError (PHP 8) 简介 当传递给 match 表达式的主体未被 match 表达式的任何分支处理时， 将会抛出 UnhandledMatchError。 类摘要 class UnhandledMatchError extends Error { /* 继承的属性 */ protected string $message = ""; private string $string = ""; protected int $code; protected string $file = ""; protected int $line; private array $trace = []; private ?Throwable $previous = null; /* 继承的方法 */ public Error::__construct(string $message = "", int $code = 0, ?Throwable $previous = null) final public Error::getMessage(): string final public Error::getPrevious(): ?Throwable final public Error::getCode(): int final public Error::getFile(): string final public Error::getLine(): int final public Error::getTrace(): array final public Error::getTraceAsString(): string public Error::__toString(): string private Error::__clone(): void }