PHP 8.4.2 Released!

    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

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    用户贡献的备注 1 note

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    43
    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
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