(PHP 5, PHP 7)
このオブジェクトは、別のイテレータからキャッシュされた反復処理をサポートします。
CachingIterator::CALL_TOSTRINGConvert every element to string.
CachingIterator::CATCH_GET_CHILDDon't throw exception in accessing children.
CachingIterator::TOSTRING_USE_KEYUse key for conversion to string.
CachingIterator::TOSTRING_USE_CURRENTUse current for conversion to string.
CachingIterator::TOSTRING_USE_INNERUse inner for conversion to string.
CachingIterator::FULL_CACHECache all read data.