从大型数据集中获取 OOM

Question

我正在尝试从包含 60k 条目的数组创建电子表格 (XLSX)。当它导出时，它给了我一个电子表格，上面只有 PHP OOM 警告。

    $spreadsheet = new Spreadsheet();
    $spreadsheet->setActiveSheetIndex(0);
    $activeSheet = $spreadsheet->getActiveSheet();

    $rowIndex = 2;

    foreach ($this->_values as $_val){
        $activeSheet->setCellValueByColumnAndRow(1, $rowIndex, trim($_val['item1']));
        $activeSheet->setCellValueByColumnAndRow(2, $rowIndex, trim($_val['item2']));
        $activeSheet->setCellValueByColumnAndRow(3, $rowIndex, trim($_val['item3']));
        $activeSheet->setCellValueByColumnAndRow(4, $rowIndex, trim($_val['item4']));
        $activeSheet->setCellValueByColumnAndRow(5, $rowIndex, trim($_val['item5']));
        $activeSheet->setCellValueByColumnAndRow(6, $rowIndex, trim($_val['item6']));
        $activeSheet->setCellValueByColumnAndRow(7, $rowIndex, trim($_val['item7']));
        $activeSheet->setCellValueByColumnAndRow(8, $rowIndex, trim($_val['item8']));
        $activeSheet->setCellValueByColumnAndRow(9, $rowIndex, trim($_val['item9']));
        $activeSheet->setCellValueByColumnAndRow(10, $rowIndex, trim($_val['item10']));
        $activeSheet->setCellValueByColumnAndRow(11, $rowIndex, trim($_val['item11']));

        $rowIndex += 1;
    }

    $spreadsheet->garbageCollect();

    $writer = new Xlsx($spreadsheet);
    $writer->setPreCalculateFormulas(false);
    $writer->setUseDiskCaching(true);
    $writer->save("php://temp");

    $spreadsheet->disconnectWorksheets();
    unset($spreadsheet);

Answer 1

内存不足错误是因为您的系统内存不足。你可以简单地 increase the amount of memory 使用像 ini_set('memory_limit', '750M'); 假设你的系统有 space

或者，如果不需要 XLSX（即：如果您可以改用 CSV，Excel 仍然可以打开），您可以将数据流式传输到电子表格，而不是将其全部加载到内存中一次，然后打印。看起来像这样：

foreach ($this->_values as $_val){
    for($i=1; $i<=11; $i++) {
        echo trim($_val['item'.$i]);
        if($i<11) echo ",";
    }
    echo "\n";
}

您也可以 include the CSV header at the top of the PHP file，这样页面会提示下载而不是显示 CSV 文件的内容。这是 CSV header 校准：header("Content-type: text/csv");

从大型数据集中获取 OOM

Getting OOM from large dataset

php

out-of-memory

phpspreadsheet