如何改善 PhpSpreadsheet 数据从本地文件检索的时间？

Question

我正在使用 PhpSpreadsheet 从本地 xlsx 文件读取特定值，但需要 510 毫秒，这太慢了。我需要它在 20 毫秒以下，类似于从 CSV 文件中读取 CSV 格式的相同数据。有什么加快代码速度的技巧吗？

<?php
require '/vendor/autoload.php'; // Include PhpSpreadsheet library

use PhpOffice\PhpSpreadsheet\IOFactory;

$xlsxFile = 'local.xlsx'; // path to XLSX file
$targetRowNumber = 302; // row number to access
$targetColumn = 3; // column number (C = 3)

try {
    $trystarttime = microtime(true);
    // Load the XLSX file
    $spreadsheet = IOFactory::load($xlsxFile);

    // Get the value of the specified cell (column 2, row 301)
    $value = $spreadsheet->getActiveSheet()->getCellByColumnAndRow($targetColumn, $targetRowNumber)->getValue();
    
    echo "Value in column $targetColumn, row $targetRowNumber: " . $value . "\n";

    $tryendtime = microtime(true);
    $durationInMilliseconds = (number_format(($tryendtime - $trystarttime) * 1000, 2)) . "ms to fetch the required row value" . PHP_EOL;

    echo $durationInMilliseconds;

} catch (Exception $e) {
    echo "Error: " . $e->getMessage() . "\n";
    echo "Trace: " . $e->getTraceAsString() . "\n";
}
?>

Answer 1

如果您知道文件类型，您可能可以通过直接创建（在本例中）XLSX 阅读器来赢得一些性能

$reader = new \PhpOffice\PhpSpreadsheet\Reader\Xlsx();
$spreadsheet = $reader->load($inputFileName);

另请参阅 readthedocs.io 上的 文档

Answer 2

如果您希望能够像读取纯文本 CSV 文件一样高效地加载 Xlsx 等复杂文件格式，那么请重新考虑您的假设。 话虽这么说，如果您只需要读取单个单元格值，那么您可以采取很多措施来提高性能。

如果您只需要文件中的数据，而不需要结构或样式信息，请在启用

ReadDataOnly

的情况下加载它。

$reader = new \PhpOffice\PhpSpreadsheet\Reader\Xlsx();
$reader->setReadDataOnly(true);
$spreadsheet = $reader->load($inputFileName);

如果文件有多个工作表，并且您只对其中一个工作表中的数据感兴趣，则告诉加载程序仅加载该工作表。

$reader = new \PhpOffice\PhpSpreadsheet\Reader\Xlsx();
$reader->setLoadSheetsOnly('Worksheet 1');
$spreadsheet = $reader->load($inputFileName);

如果您知道要读取的单元格地址（或多个地址），则使用

读取过滤器仅从文件中读取这些单元格。

/**  Define a Read Filter class implementing \PhpOffice\PhpSpreadsheet\Reader\IReadFilter  */
class MyReadFilter implements \PhpOffice\PhpSpreadsheet\Reader\IReadFilter
{
    public function readCell($targetColumn, $targetRowNumber, $worksheetName = '') {
        if ($row == $targetRowNumber) {
            if ($columnAddress == $targetColumn) {
                return true;
            }
        }
        return false;
    }
}

/**  Create an Instance of our Read Filter  **/
$filterSubset = new MyReadFilter('C', 103);

$reader = new \PhpOffice\PhpSpreadsheet\Reader\Xlsx();
/**  Tell the Reader that we want to use the Read Filter  **/
$reader->setReadFilter($filterSubset);
/**  Load only the rows and columns that match our filter to Spreadsheet  **/
$spreadsheet = $reader->load($inputFileName);

这些功能均已记录。

Answer 3

尝试另一个库：

https://packagist.org/packages/avadim/fast-excel-reader

use \avadim\FastExcelReader\Excel;

$xlsxFile = 'local.xlsx'; // path to XLSX file
$targetRowNumber = 302; // row number to access
$targetColumn = 3; // column number (C = 3)

$cellAddress = 'C302';

try {
    $trystarttime = microtime(true);
    // Load the XLSX file
    $excel = Excel::open($xlsxFile);
    $excel->setReadArea($cellAddress);

    $cells = $excel->readCells();

    // Get the value of the specified cell
    $value = $cells[$cellAddress];

    echo "Value in $cellAddress: " . $value . "\n";

    $tryendtime = microtime(true);
    $durationInMilliseconds = (number_format(($tryendtime - $trystarttime) * 1000, 2)) . "ms to fetch the required row value" . PHP_EOL;

    echo $durationInMilliseconds;

} catch (Exception $e) {
    echo "Error: " . $e->getMessage() . "\n";
    echo "Trace: " . $e->getTraceAsString() . "\n";
}