PHP中的生成器

python中有的,php一样不落下呀。

<?php
//生成器
//生成器代理
//生成器返回表达示

function gen1() {
    yield '1';
    yield '2';
    yield '3';
}

function gen2() {
    yield '4';
    yield '5';
    yield '6';
}

function gen3() {
    yield '7';
    yield '8';
    yield from gen1();
    yield '9';
    yield from gen2();
    yield '10';
}

foreach (gen1() as $number) {
    echo $number;
    echo '<br/>';
}
echo '==========yield from===<br/>';
foreach (gen3() as $number) {
    echo $number;
    echo '<br/>';
}

function gen() {
    yield 'A';
    yield 'B';
    yield 'C';

    return 'gen-return';
}

$generator = gen();

var_dump($generator);
echo '<br/>';
// output of the below code: Fatal error
//var_dump($generator->getReturn());
foreach ($generator as $letter) {
    echo $letter;
    echo '<br/>';
}
var_dump($generator->getReturn());
echo '<br/>';
?>

输出

1
2
3
==========yield from===
7
8
1
2
3
9
4
5
6
10
object(Generator)#1 (0) { }
A
B
C
string(10) "gen-return"