This is important when considering how other Generators work such as JavaScript's an Python's. While PHP's generator has the ->valid() method they don't, or an equivalent. JS uses Iterator protocol which says next() should return an object of
{
done: bool,
value: mixed
}
In which case you can use keys->done to see if the generator can still be iterated.
Generator::key
(PHP 5 >= 5.5.0, PHP 7)
Generator::key — Get the yielded key
인수
이 함수는 인수가 없습니다.
반환값
Returns the yielded key.
예제
Example #1 Generator::key() example
<?php
function Gen()
{
yield 'key' => 'value';
}
$gen = Gen();
echo "{$gen->key()} => {$gen->current()}";
위 예제의 출력:
key => value
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User Contributed Notes 1 note
jasonrlester at yahoo dot com ¶
2 years ago
