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                CachingIterator此對象支持在另一個迭代器上緩存迭代 ``` CachingIterator extends IteratorIterator implements OuterIterator , ArrayAccess , Countable { /* 常量 */ const integer CALL_TOSTRING = 1 ;//將每個元素轉換為字符串。 const integer CATCH_GET_CHILD = 16 ;//在訪問兒童時不要拋出異常 const integer TOSTRING_USE_KEY = 2 ;//使用鍵將其轉換為字符串 const integer TOSTRING_USE_CURRENT = 4 ;//使用current轉換為string const integer TOSTRING_USE_INNER = 8 ;//使用inner 轉換為字符串 const integer FULL_CACHE = 256 ;//緩存所有讀取的數據 /* 方法 */ public getCache ( void ) : array -- 檢索緩存的內容 public getFlags ( void ) : int -- 獲取使用的標志 public hasNext ( void ) : void -- 檢查內部迭代器是否具有有效的下一個元素 public setFlags ( int $flags ) : void -- 設置表標志 public __toString ( void ) : void //IteratorIterator public __construct ( Iterator $iterator [, int $flags = self::CALL_TOSTRING ] ) //OuterIterator public getInnerIterator ( void ) : Iterator public current ( void ) : mixed public key ( void ) : scalar public next ( void ) : void public rewind ( void ) : void public valid ( void ) : void //Countable public count ( void ) : int //ArrayAccess public offsetExists ( mixed $index ) : void public offsetGet ( string $index ) : void public offsetSet ( mixed $index , mixed $newval ) : void public offsetUnset ( string $index ) : void } ``` ``` //該代碼段將打印出所有緩存的元素(foreach). $cache = new CachingIterator(new ArrayIterator(range(1,100)), CachingIterator::FULL_CACHE); foreach ($cache as $c) { } print_r($cache->getCache());//[0=>1,1=>2,...,99=>100] ```
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