迭代器
PHP Manual

The EmptyIterator class

(PHP 5 >= 5.1.0, PHP 7)

简介

The EmptyIterator class for an empty iterator.

类摘要

EmptyIterator implements Iterator {
/* 方法 */
public mixed current ( void )
public scalar key ( void )
public void next ( void )
public void rewind ( void )
public bool valid ( void )
}

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迭代器
PHP Manual