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 ( ) : mixed
public key ( ) : mixed
public next ( ) : void
public rewind ( ) : void
public send ( mixed $value ) : mixed
public throw ( Exception $exception ) : void
public valid ( ) : bool
public __wakeup ( ) : void
}

Table of Contents

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