search
HomeBackend DevelopmentPHP TutorialSolution to phpExcel memory overflow when exporting files

The content of this article is about the solution to phpExcel memory overflow when exporting files. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

When using PHPExcel to export files, PHP memory overflow errors are often reported because the files are too large. In order to solve this problem, you can use the parameters provided by PHPExcel for optimization. The oversized Excel file mentioned here does not necessarily mean the file size, but more importantly, the data and format stored in the file. If there is a lot of data and the format is relatively rich, it will easily exhaust the memory of PHP.

Information 2 points out that a cell in Excel occupies approximately 1K of memory without caching enabled, and a table with 8,000 rows and 31 columns (248,000 cells) requires 242MB of memory. If caching is enabled, it will drop to 80MB, and the effect is still very obvious.

It should be noted during use that the memory optimization parameters of PHPExcel are not in the PHPExcel object and need to be set before PHPExcel is instantiated.

$cacheMethod = PHPExcel_CachedObjectStorageFactory::cache_to_phpTemp;
$cacheSettings = array( 'memoryCacheSize' => '512MB');
PHPExcel_Settings::setCacheStorageMethod($cacheMethod,$cacheSettings);

$oExcel = new PHPExcel();

Several parameters of PHPExcel_Settings::setCacheStorageMethod()

Serialize the cell data and save it in memory

PHPExcel_CachedObjectStorageFactory::cache_in_memory_serialized;

Serialize the cell and then perform Gzip Compressed and then saved in memory

PHPExcel_CachedObjectStorageFactory::cache_in_memory_gzip;

Cached in a temporary disk file, the speed may be slower

PHPExcel_CachedObjectStorageFactory::cache_to_discISAM;

Saved in php://temp

PHPExcel_CachedObjectStorageFactory::cache_to_phpTemp;

Saved in

$cacheMethod = PHPExcel_CachedObjectStorageFactory::cache_to_memcache;  
$cacheSettings = array( 'memcacheServer'  => 'localhost',  
    'memcachePort'    => 11211,  
    'cacheTime'       => 600  
);  
PHPExcel_Settings::setCacheStorageMethod($cacheMethod, $cacheSettings);

Other ways to reduce memory usage in memcache

If you do not need to read the Excel cell format, you can set it to only read data.

$objReader = PHPExcel_IOFactory::createReader('Excel2007');
$objReader->setReadDataOnly(true);
$objPHPExcel = $objReader->load("test.xlsx”);

If there are multiple Sheets in Excel, but we only need to read a few of them, in order to reduce memory consumption, we can also set it.

$objReader = PHPExcel_IOFactory::createReader('Excel2007');
$objReader->setLoadSheetsOnly( array("Worksheet1", "Worksheet2") );
$objPHPExcel = $objReader->load("test.xlsx”);

If you only need to read a certain area in the Sheet, you can also set a filter.

class MyReadFilter implements PHPExcel_Reader_IReadFilter
{
    public function readCell($column, $row, $worksheetName = '') {
        // Read title row and rows 20 - 30
        if ($row == 1 || ($row >= 20 && $row <= 30)) {
            return true;
        }

        return false;
    }
}

$objReader = PHPExcel_IOFactory::createReader(&#39;Excel2007&#39;);
$objReader->setReadFilter( new MyReadFilter() );
$objPHPExcel = $objReader->load("test.xlsx”);

In the end, I used the following method

// 如果是因为特殊字符引起的,可以在load方法之前加上setReadDataOnly(意思是忽略任何格式的信息)方法,就可以避免 
$objReader->setReadDataOnly(true);//只需要添加这个方法
$objPHPExcel = $objReader->load($uploadFilePath);

Related recommendations:

Solution to the memory overflow error when phpExcel exports a large amount of data

phpexcel Problems related to saving and downloading exported excel files

The above is the detailed content of Solution to phpExcel memory overflow when exporting files. For more information, please follow other related articles on the PHP Chinese website!

Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
What is PDO in PHP?What is PDO in PHP?Apr 28, 2025 pm 04:51 PM

The article discusses PHP Data Objects (PDO), an extension for database access in PHP. It highlights PDO's role in enhancing security through prepared statements and its benefits over MySQLi, including database abstraction and better error handling.

What is Memcache and Memcached in PHP? Is it possible to share a single instance of a Memcache between several projects of PHP?What is Memcache and Memcached in PHP? Is it possible to share a single instance of a Memcache between several projects of PHP?Apr 28, 2025 pm 04:47 PM

Memcache and Memcached are PHP caching systems that speed up web apps by reducing database load. A single instance can be shared among projects with careful key management.

What are the steps to create a new database using MySQL and PHP?What are the steps to create a new database using MySQL and PHP?Apr 28, 2025 pm 04:44 PM

Article discusses steps to create and manage MySQL databases using PHP, focusing on connection, creation, common errors, and security measures.

Does JavaScript interact with PHP?Does JavaScript interact with PHP?Apr 28, 2025 pm 04:43 PM

The article discusses how JavaScript and PHP interact indirectly through HTTP requests due to their different environments. It covers methods for sending data from JavaScript to PHP and highlights security considerations like data validation and prot

How to execute a PHP script from the command line?How to execute a PHP script from the command line?Apr 28, 2025 pm 04:41 PM

The article discusses executing PHP scripts from the command line, including steps, common options, troubleshooting errors, and security considerations.

What is PEAR in PHP?What is PEAR in PHP?Apr 28, 2025 pm 04:38 PM

PEAR is a PHP framework for reusable components, enhancing development with package management, coding standards, and community support.

What are the uses of PHP?What are the uses of PHP?Apr 28, 2025 pm 04:37 PM

PHP is a versatile scripting language used mainly for web development, creating dynamic pages, and can also be utilized for command-line scripting, desktop apps, and API development.

What was the old name of PHP?What was the old name of PHP?Apr 28, 2025 pm 04:36 PM

The article discusses PHP's evolution from "Personal Home Page Tools" in 1995 to "PHP: Hypertext Preprocessor" in 1998, reflecting its expanded use beyond personal websites.

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

WebStorm Mac version

WebStorm Mac version

Useful JavaScript development tools

MantisBT

MantisBT

Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.

ZendStudio 13.5.1 Mac

ZendStudio 13.5.1 Mac

Powerful PHP integrated development environment

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

PhpStorm Mac version

PhpStorm Mac version

The latest (2018.2.1) professional PHP integrated development tool