问题
i export file xlsx using phpexcel, data have 32 cols and many rows. Each day data increase so data will very big. This is my code:
$filename="data.xlsx";
$cacheMethod = PHPExcel_CachedObjectStorageFactory:: cache_to_phpTemp;
$cacheSettings = array( 'memoryCacheSize' => '128MB');
PHPExcel_Settings::setCacheStorageMethod($cacheMethod, $cacheSettings);
ini_set('max_execution_time', 123456);
$objPHPExcel = new PHPExcel();
$objPHPExcel->setActiveSheetIndex(0);
$i = 2;
$objPHPExcel->getActiveSheet()->setCellValue('A1', 'Header1');
$objPHPExcel->getActiveSheet()->setCellValue('B1', 'Header2');
$objPHPExcel->getActiveSheet()->setCellValue('C1', 'Header3');
$objPHPExcel->getActiveSheet()->setCellValue('D1', 'Header4');
$objPHPExcel->getActiveSheet()->setCellValue('E1', 'Header5');
$objPHPExcel->getActiveSheet()->setCellValue('F1', 'Header6');
$objPHPExcel->getActiveSheet()->setCellValue('G1', 'Header7');
$objPHPExcel->getActiveSheet()->setCellValue('H1', 'Header8');
$objPHPExcel->getActiveSheet()->setCellValue('I1', 'Header9');
$objPHPExcel->getActiveSheet()->setCellValue('J1', 'Header10');
$objPHPExcel->getActiveSheet()->setCellValue('K1', 'Header11');
$objPHPExcel->getActiveSheet()->setCellValue('L1', 'Header12');
$objPHPExcel->getActiveSheet()->setCellValue('M1', 'Header13');
$objPHPExcel->getActiveSheet()->setCellValue('N1', 'Header14');
$objPHPExcel->getActiveSheet()->setCellValue('O1', 'Header15');
$objPHPExcel->getActiveSheet()->setCellValue('P1', 'Header16');
$objPHPExcel->getActiveSheet()->setCellValue('Q1', 'Header17');
$objPHPExcel->getActiveSheet()->setCellValue('R1', 'Header18');
$objPHPExcel->getActiveSheet()->setCellValue('S1', 'Header19');
$objPHPExcel->getActiveSheet()->setCellValue('T1', 'Header20');
$objPHPExcel->getActiveSheet()->setCellValue('U1', 'Header21');
$objPHPExcel->getActiveSheet()->setCellValue('V1', 'Header22');
$objPHPExcel->getActiveSheet()->setCellValue('W1', 'Header23');
$objPHPExcel->getActiveSheet()->setCellValue('X1', 'Header24');
$objPHPExcel->getActiveSheet()->setCellValue('Y1', 'Header25');
$objPHPExcel->getActiveSheet()->setCellValue('Z1', 'Header26');
$objPHPExcel->getActiveSheet()->setCellValue('AA1', 'Header27');
$objPHPExcel->getActiveSheet()->setCellValue('AB1', 'Header28');
$objPHPExcel->getActiveSheet()->setCellValue('AC1', 'Header29');
$objPHPExcel->getActiveSheet()->setCellValue('AD1', 'Header30');
$objPHPExcel->getActiveSheet()->setCellValue('AE1', 'Header31');
$objPHPExcel->getActiveSheet()->setCellValue('AF1', 'Header32');
foreach ($data as $value) {
$objPHPExcel->getActiveSheet()->setCellValue('A'.$i, $value['1']);
$objPHPExcel->getActiveSheet()->setCellValue('B'.$i, $value['2']);
$objPHPExcel->getActiveSheet()->setCellValue('C'.$i, $value['3']);
$objPHPExcel->getActiveSheet()->setCellValue('D'.$i, $value['4']);
$objPHPExcel->getActiveSheet()->setCellValue('E'.$i, $value['5']);
$objPHPExcel->getActiveSheet()->setCellValue('F'.$i, $value['6']);
$objPHPExcel->getActiveSheet()->setCellValue('G'.$i, $value['7']);
$objPHPExcel->getActiveSheet()->setCellValue('H'.$i, $value['8']);
$objPHPExcel->getActiveSheet()->setCellValue('I'.$i, $value['9']);
$objPHPExcel->getActiveSheet()->setCellValue('J'.$i, $value['10']);
$objPHPExcel->getActiveSheet()->setCellValue('K'.$i, $value['11']);
$objPHPExcel->getActiveSheet()->setCellValue('L'.$i, $value['12']);
$objPHPExcel->getActiveSheet()->setCellValue('M'.$i, $value['13']);
$objPHPExcel->getActiveSheet()->setCellValue('N'.$i, $value['14']);
$objPHPExcel->getActiveSheet()->setCellValue('O'.$i, $value['15']);
$objPHPExcel->getActiveSheet()->setCellValue('P'.$i, $value['16']);
$objPHPExcel->getActiveSheet()->setCellValue('Q'.$i, $value['17');
$objPHPExcel->getActiveSheet()->setCellValue('R'.$i, $value['18']);
$objPHPExcel->getActiveSheet()->setCellValue('S'.$i, $value['19']);
$objPHPExcel->getActiveSheet()->setCellValue('T'.$i, $value['20']);
$objPHPExcel->getActiveSheet()->setCellValue('U'.$i, $value['21']);
$objPHPExcel->getActiveSheet()->setCellValue('V'.$i, $value['22']);
$objPHPExcel->getActiveSheet()->setCellValue('W'.$i, $value['23']);
$objPHPExcel->getActiveSheet()->setCellValue('X'.$i, $value['24']);
$objPHPExcel->getActiveSheet()->setCellValue('Y'.$i, $value['25']);
$objPHPExcel->getActiveSheet()->setCellValue('Z'.$i, $value['26']);
$objPHPExcel->getActiveSheet()->setCellValue('AA'.$i, $value['27']);
$objPHPExcel->getActiveSheet()->setCellValue('AB'.$i, $value['28']);
$objPHPExcel->getActiveSheet()->setCellValue('AC'.$i, $value['29']);
$objPHPExcel->getActiveSheet()->setCellValue('AD'.$i, $value['30']);
$objPHPExcel->getActiveSheet()->setCellValue('AE'.$i, $value['31']);
$objPHPExcel->getActiveSheet()->setCellValue('AF'.$i, $value['32']);
$i++;
}
$objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel2007');
ob_end_clean();
header("Content-type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
header("Content-Disposition: attachment; filename=".$filename);
header('Cache-Control: max-age=0');
$objWriter->setUseDiskCaching(true);
$objWriter->save("php://output");
two days ago, it's run good. But today, its throw a exception: Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 85 bytes) in /..../Classes/PHPExcel/CachedObjectStorage/CacheBase.php on line 155
回答1:
As another point to note, you're building the PHPExcel object by looping through an array called $data.... a 2d array, that I'm guessing is built from looping through the results of a database query.
That $data array is also going to be using a large part of your memory, more and more memory each day as the number of results grows.
It would be more efficient if, instead of looping through the database resultset to build a large array and then looping through that array to build the PHPExcel data, you looped through the database resultset and built the PHPExcel data directly. That eliminates the memory overhead of $data, and reduces 2 loops to 1.
回答2:
Remember that PHP uses memory as well as the script itself, in addition to the memory used by the PHPExcel object.
If you set cache_to_phpTemp with a memoryCacheSize, the the PHPExcel object will use memory up to that limit, and then switch to using a temporary file. Your memoryCacheSize is the same as your absolute php.ini memory limit (128MB), so PHPExcel will never switch to using the temporary file cell cache before PHP's own limit is reached. Try setting a lower memoryCacheSize (e.g. 64MB) so at least PHPExcel will get a chance to cache cells and reduce its own memory usage.
来源：https://stackoverflow.com/questions/19476176/allowed-memory-size-of-134217728-bytes-exhausted-in-phpexcel