Reading .xls file via PHPExcel throws Fatal error: allowed memory size... even with chunk reader

Question

我正在使用 PHPExcel 读取 .xls 文件。我认识的时间很短

Fatal error: Allowed memory size of 1073741824 bytes exhausted (tried to allocate 730624 bytes) in Excel\PHPExcel\Shared\OLERead.php on line 93

经过一些谷歌搜索后，我尝试使用 chunkReader 来防止这种情况（甚至在 PHPExcel 主页上也提到过），但我仍然遇到这个错误。

我的想法是，通过块 reader，我将逐个读取文件，我的内存不会溢出。但是肯定有一些严重的内存泄漏？或者我正在释放一些内存不好？我什至试图将服务器内存提高到 1GB。我尝试读取的文件大小约为 700k，这并不算大（我还可以毫无问题地读取 ~20MB pdf、xlsx、docx、doc 等文件）。所以我假设可能只是我忽略了一些小巨魔。

代码如下所示

function parseXLS($fileName){
    require_once dirname(__FILE__) . './sphider_design/include/Excel/PHPExcel/IOFactory.php';
    require_once dirname(__FILE__) . './sphider_design/include/Excel/PHPExcel/ChunkReadFilter.php';

    $inputFileType = 'Excel5';

    /**  Create a new Reader of the type defined in $inputFileType  **/
    $objReader = PHPExcel_IOFactory::createReader($inputFileType);
    /**  Define how many rows we want to read for each "chunk"  **/ 
    $chunkSize = 20;
    /**  Create a new Instance of our Read Filter  **/ 
    $chunkFilter = new chunkReadFilter(); 
    /**  Tell the Reader that we want to use the Read Filter that we've Instantiated  **/ 
    $objReader->setReadFilter($chunkFilter); 

    /**  Loop to read our worksheet in "chunk size" blocks  **/ 
    /**  $startRow is set to 2 initially because we always read the headings in row #1  **/
    for ($startRow = 2; $startRow <= 65536; $startRow += $chunkSize) { 
        /**  Tell the Read Filter, the limits on which rows we want to read this iteration  **/ 
        $chunkFilter->setRows($startRow,$chunkSize); 
        /**  Load only the rows that match our filter from $inputFileName to a PHPExcel Object  **/ 
        $objPHPExcel = $objReader->load($fileName); 
        //    Do some processing here 

        //    Free up some of the memory 
        $objPHPExcel->disconnectWorksheets(); 
        unset($objPHPExcel); 
    }
}

这里是 chunkReader 的代码

class chunkReadFilter implements PHPExcel_Reader_IReadFilter
{
    private $_startRow = 0;
    private $_endRow = 0;

    /**  Set the list of rows that we want to read  */ 
    public function setRows($startRow, $chunkSize) { 
        $this->_startRow    = $startRow; 
        $this->_endRow      = $startRow + $chunkSize;
    } 

    public function readCell($column, $row, $worksheetName = '') {
        //  Only read the heading row, and the rows that are configured in $this->_startRow and $this->_endRow 
        if (($row == 1) || ($row >= $this->_startRow && $row < $this->_endRow)) { 
           return true;
        }
        return false;
    } 
}

Answer 1

希望以下链接对您有所帮助：

PHPExcel runs out of 256, 512 and also 1024MB of RAM

http://phpexcel.codeplex.com/discussions/242712?ProjectName=phpexcel

Answer 2

所以我在这里找到了有趣的解决方案How to read large worksheets from large Excel files (27MB+) with PHPExcel?

as 附录 3 有问题

edit1：同样通过这个解决方案，我遇到了我最喜欢的 errr 消息的瓶颈，但我发现了一些关于缓存的东西，所以我实现了这个

$cacheMethod = PHPExcel_CachedObjectStorageFactory::cache_to_phpTemp;
$cacheSettings = array(' memoryCacheSize ' => '8MB');
PHPExcel_Settings::setCacheStorageMethod($cacheMethod, $cacheSettings);

最近我只对小于 10MB 的 xls 文件进行了测试，但它似乎可以工作（我也设置了 $objReader->setReadDataOnly(true);）并且它似乎足够平衡以实现速度和内存消耗。（如果可能的话，我会更多地走我的荆棘之路）

编辑2：所以我做了一些进一步的研究，发现 chunk reader 对我来说是不必要的。（在我看来，内存问题与块 reader 和没有它一样。）所以我对我的问题的最终回答是这样的，它读取 .xls 文件（仅来自单元格的数据，没有格式化，甚至过滤出公式）。当我使用 cache_tp_php_temp 我能够在几秒钟内读取 xls 文件（测试为 10MB）和大约 10k 行和多列并且没有内存问题

function parseXLS($fileName){

/** PHPExcel_IOFactory */
    require_once dirname(__FILE__) . './sphider_design/include/Excel/PHPExcel/IOFactory.php';
    require_once dirname(__FILE__) . './sphider_design/include/Excel/PHPExcel/ChunkReadFilter.php';
    require_once dirname(__FILE__) . './sphider_design/include/Excel/PHPExcel.php';

    $inputFileName = $fileName;
    $fileContent = "";

    //get inputFileType (most of time Excel5)
    $inputFileType = PHPExcel_IOFactory::identify($inputFileName);

    //initialize cache, so the phpExcel will not throw memory overflow
    $cacheMethod = PHPExcel_CachedObjectStorageFactory::cache_to_phpTemp;
    $cacheSettings = array(' memoryCacheSize ' => '8MB');
    PHPExcel_Settings::setCacheStorageMethod($cacheMethod, $cacheSettings);

    //initialize object reader by file type
    $objReader = PHPExcel_IOFactory::createReader($inputFileType);

    //read only data (without formating) for memory and time performance
    $objReader->setReadDataOnly(true);

    //load file into PHPExcel object
    $objPHPExcel = $objReader->load($inputFileName);

    //get worksheetIterator, so we can loop sheets in workbook
    $worksheetIterator = $objPHPExcel->getWorksheetIterator();

    //loop all sheets
    foreach ($worksheetIterator as $worksheet) {    

            //use worksheet rowIterator, to get content of each row
            foreach ($worksheet->getRowIterator() as $row) {
                //use cell iterator, to get content of each cell in row
                $cellIterator = $row->getCellIterator();
                //dunno
                $cellIterator->setIterateOnlyExistingCells(false);      

                //iterate each cell
                foreach ($cellIterator as $cell) {
                    //check if cell exists
                    if (!is_null($cell)) {
                        //get raw value (without formating, and all unnecessary trash)
                        $rawValue = $cell->getValue();
                        //if cell isnt empty, print its value
                        if ((trim($rawValue) <> "") and (substr(trim($rawValue),0,1) <> "=")){
                            $fileContent .= $rawValue . " ";                                            
                        }
                    }
                }       
            }       
    }

    return $fileContent;
}

Answer 3

这是我根据您的示例所做的。我发现需要设置一些带有 php 引擎的变量才能确保函数成功。看看这个。我删除了一些部分以插入到我的数据库中，但主要思想在这里。

$upload_dir = dirname(__DIR__) . "/uploads/";
$inputFileName = $upload_dir . basename($_FILES["fileToUpload"]["name"]);
$insertOk = FALSE;

// get inputFileType (most of time Excel5)
$inputFileType = PHPExcel_IOFactory::identify($inputFileName);

// initialize cache, so the phpExcel will not throw memory overflow
ini_set('memory_limit', '-1');
ini_set('max_execution_time', 180); // 180 seconds of execution time maximum
$cacheMethod = PHPExcel_CachedObjectStorageFactory::cache_to_phpTemp;
$cacheSettings = array(' memoryCacheSize ' => '8MB');
PHPExcel_Settings::setCacheStorageMethod($cacheMethod, $cacheSettings);

// initialize object reader by file type
$objReader = PHPExcel_IOFactory::createReader($inputFileType);

// read only data (without formating) for memory and time performance
$objReader->setReadDataOnly(true);

// load file into PHPExcel object
$objPHPExcel = $objReader->load($inputFileName);
$objPHPExcel->setActiveSheetIndex(0);

$spreadsheetInfo = $objReader->listWorksheetInfo($inputFileName);
$maxRowsAllowed = $spreadsheetInfo[0]['totalRows']; 

// Define how many rows we want to read for each "chunk"
$chunkSize = 200;

// Create a new Instance of our Read Filter
$chunkFilter = new ReportChunkReadFilter();

//  Tell the Reader that we want to use the Read Filter that we've
//  Instantiated
$objReader->setReadFilter($chunkFilter);

// Loop to read our worksheet in "chunk size" blocks
for ($startRow = 0; $startRow <= $maxRowsAllowed; $startRow += $chunkSize) {
    // Tell the Read Filter, the limits on which rows we want to 
    // read this iteration
    $chunkFilter->setRows($startRow,$chunkSize);

    // Load only the rows that match our filter from $inputFileName
    // to a PHPExcel Object
    $objPHPExcel = $objReader->load($inputFileName);
    $sheetData = $objPHPExcel->getActiveSheet()->toArray(null,true,true,true);

    // loop on the rows of the filtered excel file (the chunk)
    foreach ($sheetData as $rowArray) {                                    
      echo $rowArray['A'];  
      // do your stuff here
    }

    // Free up some of the memory 
    $objPHPExcel->disconnectWorksheets(); 
    unset($objPHPExcel);                    
}

unlink($inputFileName);

Reading .xls file via PHPExcel throws Fatal error: allowed memory size... even with chunk reader

Reading .xls file via PHPExcel throws Fatal error: allowed memory size... even with chunk reader

php

memory-leaks

phpexcel