Generator::current »

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生成器类

(PHP 5 >= 5.5.0, PHP 7, PHP 8)

简介

Generator 对象是从 generators返回的.

警告

Generator 对象不能通过 new 实例化.

类摘要

final class Generator implements Iterator {

/* 方法 */

public current(): mixed

public getReturn(): mixed

public key(): mixed

public next(): void

public rewind(): void

public send(mixed $value): mixed

public throw(Throwable $exception): mixed

public valid(): bool

public __wakeup(): void

}

参见

也可以参考遍历对象。

目录

Generator::current — 返回当前产生的值
Generator::getReturn — 获取生成器的返回值
Generator::key — 返回当前产生的键
Generator::next — 生成器继续执行
Generator::rewind — 重置迭代器
Generator::send — 向生成器中传入一个值
Generator::throw — 向生成器中抛入一个异常
Generator::valid — 检查迭代器是否被关闭
Generator::__wakeup — 序列化回调

User Contributed Notes 1 note

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25

Pistachio ¶

8 years ago


Unlike return, yield can be used anywhere within a function so logic can flow more naturally. Take for example the following Fibonacci generator:

<?php
function fib($n)
{
    $cur = 1;
    $prev = 0;
    for ($i = 0; $i < $n; $i++) {
        yield $cur;

        $temp = $cur;
        $cur = $prev + $cur;
        $prev = $temp;
    }
}

$fibs = fib(9);
foreach ($fibs as $fib) {
    echo " " . $fib;
}

// prints: 1 1 2 3 5 8 13 21 34