How to cut large excel files with PHP (complete code attached)

This article mainly talks about using phpspreadsheet to cut large excel files. It has certain reference value. Friends who are interested can learn about it. I hope it can inspire you.

Using phpspreadsheet, you can easily parse excel files, but the memory consumption of phpspreadsheet is also relatively large. I have tried to parse nearly 5M of pure text excel, and the memory usage will exceed the default maximum memory of php of 128M.
Of course this can be solved by adjusting the memory size, but it is more dangerous when the amount of concurrency is large. So today I will introduce the next method, using phpspreadsheet to cut excel files. This is a method of exchanging time for space, so it can generally be used for low timeliness requirements.

Method:

First put a function readCell provided by phpspreadsheet official website, we can use this function to perform cutting.

First, pre-read the excel file, mainly to obtain all worksheets and the number of data rows under the worksheet. At this stage, the readCell method always returns false. We only need to record the worksheet that readCell comes in. and the number of data rows.

The next step is to analyze the obtained records and determine how many rows of original excel data need to be loaded into each part of the data. It should be noted that in order to avoid content confusion, do not cut the contents of the two worksheets together.

The last step is to loop through the analyzed data and use readCell again to obtain each part of the data. Note that each time the file is read, the disconnectWorksheets method must be used to clean up the memory of phpspreadsheet.

After my own testing, I found that using this method to parse a 5M excel file only requires an average of 21M of memory!

Code

<?php    
namespace CutExcel;    
require_once &#39;PhpSpreadsheet/autoload.php&#39;;    
/**    
 * 预读过滤类    
 * @author wangyelou     
 * @date 2018-07-30    
 */    
class MyAheadreadFilter implements \PhpOffice\PhpSpreadsheet\Reader\IReadFilter    
{    
    public $record = array();    
    private $lastRow = &#39;&#39;;    
    public function readCell($column, $row, $worksheetName = &#39;&#39;)     
    {    
        if (isset($this->record[$worksheetName]) ) {    
            if ($this->lastRow != $row) {    
                $this->record[$worksheetName] ++;           
                $this->lastRow = $row;    
            }     
        } else {    
            $this->record[$worksheetName] = 1;           
            $this->lastRow = $row;    
        }    
        return false;    
    }    
}    
/**    
 * 解析过滤类    
 * @author wangyelou     
 * @date 2018-07-30    
 */    
class MyreadFilter implements \PhpOffice\PhpSpreadsheet\Reader\IReadFilter    
{    
    public $startRow;    
    public $endRow;    
    public $worksheetName;    
    public function readCell($column, $row, $worksheetName = &#39;&#39;)     
    {    
        if ($worksheetName == $this->worksheetName && $row >= ($this->startRow+1) && $row <= ($this->endRow+1)) {    
            return true;    
        }    
        return false;    
    }    
}    
/**    
 * 切割类    
 * @author wangyelou     
 * @date 2018-07-30    
 */    
class excelCut    
{    
    public $cutNum = 5;    
    public $returnType = &#39;Csv&#39;;    
    public $fileDir = &#39;/tmp/&#39;;    
    public $log;    
    /**    
     * 切割字符串    
     * @param $str    
     * @return array|bool    
     */    
    public function cutFromStr($str)    
    {    
        try {    
            $filePath = &#39;/tmp/&#39; . time() . mt_rand(1000, 9000) . $this->returnType;    
            file_put_contents($filePath, $str);    
            if (file_exists($filePath)) {    
                $result =  $this->cutFromFile($filePath);    
                unlink($filePath);    
                return $result;    
            } else {    
                throw new Exception(&#39;文件写入错误&#39;);    
            }    
        } catch (Exception $e) {    
            $this->log = $e->getMessage();    
            return false;    
        }    
    }    
    /**    
     * 切割文件    
     * @param $file    
     * @return array|bool    
     */    
    public function cutFromFile($file)    
    {    
        try {    
            $cutRules = $this->readaheadFromFile($file);    
            $dir = $this->getFileDir($file);    
            $returnType = $this->returnType ? $this->returnType : &#39;Csv&#39;;    
            $results = array();    
            //初始化读    
            $myFilter = new MyreadFilter();    
            $inputFileType = \PhpOffice\PhpSpreadsheet\IOFactory::identify($file);    
            $reader = \PhpOffice\PhpSpreadsheet\IOFactory::createReader($inputFileType);    
            $reader->setReadDataOnly(true);    
            $reader->setReadFilter($myFilter);    
            foreach ($cutRules as $sheetName => $rowIndexRange) {    
                //读    
                list($myFilter->startRow, $myFilter->endRow, $myFilter->worksheetName) = $rowIndexRange;    
                $spreadsheetReader = $reader->load($file);    
                $sheetData = $spreadsheetReader->setActiveSheetIndexByName($myFilter->worksheetName)->toArray(null, false, false, false);    
                $realDatas = array_splice($sheetData, $myFilter->startRow, ($myFilter->endRow - $myFilter->startRow + 1));    
                $spreadsheetReader->disconnectWorksheets();    
                unset($sheetData);    
                unset($spreadsheetReader);    
                //写    
                $saveFile = $dir . $sheetName . &#39;.&#39; . $returnType;    
                $spreadsheetWriter = new \PhpOffice\PhpSpreadsheet\Spreadsheet();    
                foreach ($realDatas as $rowIndex => $row) {    
                    foreach ($row as $colIndex => $col) {    
                        $spreadsheetWriter->getActiveSheet()->setCellValueByColumnAndRow($colIndex+1, $rowIndex+1, $col);    
                    }    
                }    
                $writer = \PhpOffice\PhpSpreadsheet\IOFactory::createWriter($spreadsheetWriter, $returnType);    
                $writer->save($saveFile);    
                $spreadsheetWriter->disconnectWorksheets();    
                unset($spreadsheetWriter);    
                $results[] = $saveFile;    
            }    
            return $results;    
        } catch (Exception $e) {    
            $this->log = $e->getMessage();    
            return false;    
        }    
    }    
    /**    
     * 预读文件    
     */    
    public  function readaheadFromFile($file)    
    {    
        if (file_exists($file)) {    
            //获取统计数据    
            $myFilter = new MyAheadreadFilter();    
            $inputFileType = \PhpOffice\PhpSpreadsheet\IOFactory::identify($file);    
            $reader = \PhpOffice\PhpSpreadsheet\IOFactory::createReader($inputFileType);    
            $reader->setReadDataOnly(true); //只读数据    
            $reader->setReadFilter($myFilter);    
            $spreadsheet = $reader->load($file);    
            //$sheetData = $spreadsheet->getActiveSheet()->toArray(null, false, false, false);    
            list($fileName,) = explode(&#39;.&#39;, basename($file));    
            $datas = array();    
            $averageNum = ceil(array_sum($myFilter->record) / $this->cutNum);    
            foreach ($myFilter->record as $sheetName => $count) {    
                for ($i=0; $i<ceil($count/$averageNum); $i++) {    
                    $datas[$fileName . &#39;_&#39; . $sheetName . &#39;_&#39; . $i] = array($i*$averageNum, ($i+1)*$averageNum-1, $sheetName);    
                }    
            }    
            return $datas;    
        } else {    
            throw new Exception($file . &#39; not exists&#39;);    
        }    
    }    
    /**    
     * 创建目录    
     * @param $file    
     * @return bool|string    
     */    
    protected function getFileDir($file)    
    {    
        $baseName = basename($file);    
        list($name) = explode(&#39;.&#39;, $baseName);    
        $fullName = $name .&#39;_&#39;. time() . &#39;_&#39; . mt_rand(1000, 9999);    
        $path = $this->fileDir . $fullName . &#39;/&#39;;    
        mkdir($path, 0777);    
        chmod($path, 0777);    
        if (is_dir($path)) {    
            return $path;    
        } else {    
            $this->log = "mkdir {$path} failed";    
            return false;    
        }    
    }    
}

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