CakeFest 2024: The Official CakePHP Conference

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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User Contributed Notes 1 note

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45
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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