$reader = PHPExcel_IOFactory::createReaderForFile($file_path);
$reader->setReadDataOnly(true);

//$sheets = $this->getWorksheetNames($file['tmp_name'],0);
$reader->setLoadSheetsOnly('spreadsheetname');

$chunkFilter = new IPO_Reader(); 
$reader->setReadFilter($chunkFilter); 

$highestRow    = 10000; //$this->objWorksheet->getHighestRow();
$chunkSize     = 1; 
$highestColumn = "Y";

for ($startRow = 2; $startRow <= $highestRow; $startRow += $chunkSize) 
{ 

    $chunkFilter->setRows($startRow,$chunkSize); 
    $objPHPExcel  = $reader->load($file_path); 

    for($row = $startRow ; $row <= $startRow + $chunkSize; $row++)
    {
        $this->read_row = $objPHPExcel->getActiveSheet()->rangeToArray('A'.$row.':'.$highestColumn.$row,null,true,true);

        $this->read_row = end($this->read_row);         

        foreach($this->read_row as $column => $value)
        {
            $db_column_name = $this->_getDbColumnMap($column);
            if(!empty($db_column_name))
            {
                $this->new_data_row[$db_column_name] = $this->_getRowData($value,$column);
            }   

        }

        $this->read_row = null;
        $this->new_data_row['date_uploaded']    = date("Y-m-d H:i:s");
        $this->new_data_row['source_file_name'] = $file_name;
        $ipo_row  = new Model_UploadData_IPO();
        $ipo_row->create($this->new_data_row);
        $this->new_data_row = null;
        unset($ipo_row);

        gc_collect_cycles();

    }
    $objPHPExcel->disconnectWorksheets(); 
    unset($objPHPExcel);    
    gc_collect_cycles();

当我在取消设置objPHPExcel之前测试内存使用情况之后,没有内存增益,我真的很困惑,因为拆分成块似乎不允许我在每个块之后清除内存,以及用法逐渐上升,限制设置为250MB,它只允许我添加约500条记录