(PHP 5 >= 5.3.0, PHP 7, PHP 8)
MultipleIterator::key — Gets the registered iterator instances
此函数没有参数。
A RuntimeException if the iterator is invalid (as of PHP 8.1.0), or
mode MIT_NEED_ALL is set, and at least one attached iterator is not valid.
Calling this method from foreach triggers warning "Illegal type returned".
| 版本 | 说明 |
|---|---|
| 8.1.0 |
A RuntimeException is now thrown if
MultipleIterator::key() is called on an
invalid iterator. Previously, false was returned.
|