生成器类

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简介

Generator 对象是从 generators返回的.

Caution

Generator 对象不能通过 new 实例化.

类摘要

Generator implements Iterator {

/* 方法 */

public current ( void ) : mixed

public key ( void ) : mixed

public next ( void ) : void

public rewind ( void ) : void

public send ( mixed $value ) : mixed

public throw ( Exception $exception ) : void

public valid ( void ) : bool

public __wakeup ( void ) : void

}

Generator::current — 返回当前产生的值
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

Pistachio 05-Feb-2016 12:04


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

生成器类

简介

类摘要

Table of Contents

User Contributed Notes