(PHP 5, PHP 7)
CachingIterator::valid — Check whether the current element is valid
锟斤拷锟斤拷锟斤拷锟斤拷未锟斤拷写锟侥碉拷锟斤拷锟斤拷锟叫诧拷锟斤拷锟叫憋拷
Check whether the current element is valid.
锟剿猴拷锟斤拷没锟叫诧拷锟斤拷锟斤拷
锟缴癸拷时锟斤拷锟斤拷 TRUE锟斤拷 锟斤拷锟斤拷锟斤拷失锟斤拷时锟斤拷锟斤拷 FALSE锟斤拷
TRUE
FALSE