应用phpspreadsheet能够轻松的剖析excel文件，然则phpspreadsheet的内存斲丧也是比较大的，我试过剖析快要5M的纯文字excel内存运用量就会凌驾php默许的最大内存128M。
固然这能够用调治内存大小的要领来处理，然则在并发量大的时刻就比较风险了。所以本日引见下一种要领，应用phpspreadsheet对excel文件举行切割，这是个拿时候换空间的要领所以平常对时效性要求低的需求能够运用。
要领：
先放个phpspreadsheet官网供应的一个功用readCell，我们就能够应用这个功用来举行切割。
起首对excel文件举行预读，重如果猎取一切的事情表以及事情表下面的数据行数，这个阶段readCell要领一向返回的都是false，我们只须要纪录readCell进来的事情表及数据行数。
然后就是对猎取到的纪录举行剖析，肯定每部分数据须要装若干行原始excel的数据，须要注重的是为了防止内容殽杂，不要讲两个事情表的内容切到一同。
末了就是轮回剖析的数据和再次应用readCell猎取每部分数据，注重每次读取文件后都要应用disconnectWorksheets要领清算phpspreadsheet的内存。
经由我本身的测试发明，应用该要领剖析5M的excel文件，均匀只须要21M的内存就能够搞定！
代码
<?php
namespace CutExcel;
require_once 'PhpSpreadsheet/autoload.php';
/**
* 预读过滤类
* @author wangyelou
* @date 2018-07-30
*/
class MyAheadreadFilter implements \PhpOffice\PhpSpreadsheet\Reader\IReadFilter
{
public $record = array();
private $lastRow = '';
public function readCell($column, $row, $worksheetName = '')
{
if (isset($this->record[$worksheetName]) ) {
if ($this->lastRow != $row) {
$this->record[$worksheetName] ++;
$this->lastRow = $row;
}
} else {
$this->record[$worksheetName] = 1;
$this->lastRow = $row;
}
return false;
}
}
/**
* 剖析过滤类
* @author wangyelou
* @date 2018-07-30
*/
class MyreadFilter implements \PhpOffice\PhpSpreadsheet\Reader\IReadFilter
{
public $startRow;
public $endRow;
public $worksheetName;
public function readCell($column, $row, $worksheetName = '')
{
if ($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 = 'Csv';
public $fileDir = '/tmp/';
public $log;
/**
* 切割字符串
* @param $str
* @return array|bool
*/
public function cutFromStr($str)
{
try {
$filePath = '/tmp/' . 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('文件写入毛病');
}
} 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 : 'Csv';
$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 . '.' . $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)) {
//猎取统计数据
$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('.', 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 . '_' . $sheetName . '_' . $i] = array($i*$averageNum, ($i+1)*$averageNum-1, $sheetName);
}
}
return $datas;
} else {
throw new Exception($file . ' not exists');
}
}
/**
* 建立目次
* @param $file
* @return bool|string
*/
protected function getFileDir($file)
{
$baseName = basename($file);
list($name) = explode('.', $baseName);
$fullName = $name .'_'. time() . '_' . mt_rand(1000, 9999);
$path = $this->fileDir . $fullName . '/';
mkdir($path, 0777);
chmod($path, 0777);
if (is_dir($path)) {
return $path;
} else {
$this->log = "mkdir {$path} failed";
return false;
}
}
}
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