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(PHP 5 >= 5.3.0)
MultipleIterator::key — Gets the registered iterator instances
Get the registered iterator instances key() result.
本函数还未编写文档,仅有参数列表。
此函数没有参数。
An array of all registered iterator instances,
or FALSE
if no sub iterator is attached.
A LogicException if 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".