接口
PHP Manual

The OuterIterator interface

(PHP 5 >= 5.1.0, PHP 7)

简介

Classes implementing OuterIterator can be used to iterate over iterators.

接口摘要

OuterIterator extends Iterator {
/* 方法 */
public Iterator getInnerIterator ( void )
/* 继承的方法 */
abstract public mixed Iterator::current ( void )
abstract public scalar Iterator::key ( void )
abstract public void Iterator::next ( void )
abstract public void Iterator::rewind ( void )
abstract public bool Iterator::valid ( void )
}

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接口
PHP Manual