Question

我在尝试将数据附加到PHP的Excel文件时遇到了一些麻烦。我使用PHPExcel，代码如下。

问题是：当文件足够小时，它工作得很好。但随后文件开始变大，我开始得到允许的内存大小耗尽错误。所以，我不是每次都从头开始编写文件，而是只获取新数据并附加到文件中。但由于某种原因，它没有写入文件。

有没有人有想法？

function get_subscriptions($process, $filename){      
    /** Error reporting */
    error_reporting(E_ALL);
    ini_set('display_errors', TRUE);
    ini_set('display_startup_errors', TRUE);
    date_default_timezone_set('Europe/London');
    //define('EOL',(PHP_SAPI == 'cli') ? PHP_EOL : '<br />');

    /** Include PHPExcel */
    require_once dirname(__FILE__) . '/PHPExcel.php';
    require_once dirname(__FILE__) . '/PHPExcel/IOFactory.php';

    // Create new PHPExcel object
    //$objPHPExcel = new PHPExcel();

    $objPHPExcel = PHPExcel_IOFactory::load(dirname(__FILE__) . "/".$filename);
    $objPHPExcel->setActiveSheetIndex(0);
    $objSheet = $objPHPExcel->getActiveSheet();
    $last_line = $objSheet->getHighestRow()+1;
    $last_id = $objSheet->getCellByColumnAndRow(0, $last_line)->getCalculatedValue();

    // Set document properties
    $objPHPExcel->getProperties()->setCreator("FHGV")
        ->setLastModifiedBy("FHGV")
        ->setTitle("Report")
        ->setSubject("PSS Report")

    $objPHPExcel->setActiveSheetIndex(0)
        ->setCellValue('A1', 'ID')
        ->setCellValue('B1', 'Date')
        ->setCellValue('C1', 'Name')
        ->setCellValue('D1', 'CPF')
        ->setCellValue('E1', 'RG')
        ->setCellValue('F1', 'ZIP')
        ->setCellValue('G1', 'Address')
        ->setCellValue('H1', 'No')
        ->setCellValue('I1', 'Reference')
        ->setCellValue('J1', 'City')
        ->setCellValue('K1', 'State')
        ->setCellValue('L1', 'Other')
        ->setCellValue('M1', 'Email')
        ->setCellValue('N1', 'Phone')
        ->setCellValue('O1', 'Cell Phone')
        ->setCellValue('P1', 'Birth Date')
        ->setCellValue('Q1', 'Company')
        ->setCellValue('R1', 'Position')

    global $wpdb;
    $array = $wpdb->get_results("SELECT id, date_added as 'date',
        (select value from wp_iphorm_form_entry_data dados where element_id = 1 and entry_id = id) as 'name'
        ...
    FROM wp_iphorm_form_entries subscription
    WHERE subscription.post_title = \"".$process."\" AND id>".$last_id);

    $row = $last_line+1; $col = 0;
    foreach($array as $data){
        $objSheet->setCellValueByColumnAndRow($col++, $row, $data->id);
        $objSheet->setCellValueByColumnAndRow($col++, $row, $data->date);
        $objSheet->setCellValueByColumnAndRow($col++, $row, $data->name);
        $objSheet->setCellValueByColumnAndRow($col++, $row, $data->cpf);
        $objSheet->setCellValueByColumnAndRow($col++, $row, $data->rg);
        $objSheet->setCellValueByColumnAndRow($col++, $row, $data->zip);
        $objSheet->setCellValueByColumnAndRow($col++, $row, $data->address);
        $objSheet->setCellValueByColumnAndRow($col++, $row, $data->no);
        $objSheet->setCellValueByColumnAndRow($col++, $row, $data->reference);
        $objSheet->setCellValueByColumnAndRow($col++, $row, $data->city);
        $objSheet->setCellValueByColumnAndRow($col++, $row, $data->state);
        $objSheet->setCellValueByColumnAndRow($col++, $row, $data->others);
        $objSheet->setCellValueByColumnAndRow($col++, $row, strip_tags($data->email));
        $objSheet->setCellValueByColumnAndRow($col++, $row, $data->phone);
        $objSheet->setCellValueByColumnAndRow($col++, $row, $data->cell_phone);
        $objSheet->setCellValueByColumnAndRow($col++, $row, $data->birth_date);
        $objSheet->setCellValueByColumnAndRow($col++, $row, $data->company);
        $objSheet->setCellValueByColumnAndRow($col++, $row, $data->position);  
        $col=0;$row++;
    }

    for($col = 'A'; $col !== 'S'; $col++) {
        $objPHPExcel->getActiveSheet()
            ->getColumnDimension($col)
            ->setAutoSize(true);
    }

    // Rename worksheet
    $objSheet->setTitle('Subscriptions');

    // Save Excel 2007 file
    $callStartTime = microtime(true);
    $objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel2007');

    // Renaming the file and saving it
    $objWriter->save(str_replace('functions.php', $filename , __FILE__));
    $callEndTime = microtime(true);
    $callTime = $callEndTime - $callStartTime;
}

Answer 1

在追加数据之前，您正在阅读整个电子表格。这意味着PHPExcel会加载内存中的所有数据。如果您没有太多数据但停止为更大的电子表格工作，它会很有效。因为您的程序只有有限的可用内存，所以整个数据集不适合内存，因此程序崩溃。

您应该查看单元格缓存：https://github.com/PHPOffice/PHPExcel/blob/develop/Documentation/markdown/Overview/04-Configuration-Settings.md#cell-caching

或者，您可以查看如何使用Spout执行此操作。 Spout专门用于解决这些内存不足错误。您可以在此处找到文档：https://github.com/box/spout/wiki/Add-data-to-an-existing-spreadsheet

PHP附加到Excel文件

1 个答案: