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<?php interface IDBResult { function FetchAssoc(); function Rewind(); function NumRows(); } class DBResult implements IDBResult { private $_records = array( array('abc' => 'def'), ); private $_i = 0; function FetchAssoc() { return $this->_records[$this->_i++]; } function Rewind() { $this->_i = 0; } function NumRows() { return count($this->_records); } } class ResultIterator implements Iterator { private $_rs; private $_rec = false; private $_index = 0; private $_onLoad; function __construct(IDBResult $rs, callable $callback = null) { $this->_rs = $rs; $this->_onLoad = $callback ?: function($rec, $i) { return $rec; }; } public function current() { var_dump(__FUNCTION__); return call_user_func_array($this->_onLoad, array($this->_rec, $this->_index)); } public function key() { var_dump(__FUNCTION__); return $this->_index; } public function next() { var_dump(__FUNCTION__); $this->_index++; $this->_rec = $this->_rs->FetchAssoc(); } public function rewind() { var_dump(__FUNCTION__); $this->_index = 0; $this->_rs->Rewind(); } public function valid() { var_dump(__FUNCTION__); return $this->_index < $this->_rs->NumRows(); } } $rs = new DBResult(); $it = new ResultIterator($rs); foreach($it as $rec) { print_r($rec); }