php 预定义接口生成器类

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简介

Generator 对象是从 generators返回的.

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
}

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