文字
CachingIterator::offsetExists
(PHP 5 >= 5.2.0)
CachingIterator::offsetExists — The offsetExists purpose
说明
public void CachingIterator::offsetExists
( string
$index
) Warning
本函数还未编写文档，仅有参数列表。
参数
-
index -
The index being checked.
返回值
Returns TRUE if an entry referenced by the offset exists, FALSE otherwise.