PHP exports millions of data

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Tips ： because phpexcel and phpoffice Exporting data will overflow memory , So use php-Xlswriter# Preface

One 、 Install the extension

 pecl install xlswriter

modify php.ini

extension = xlswriter.so

Then restart to make php-fpm Settings take effect

Two 、 Use steps

1. Import and stock in

The code is as follows （ Example ）：

composer require viest/php-ext-xlswriter-ide-helper:dev-master

2. Read in the data

The code is as follows （ Example ）：

<?php
require __DIR__ . '/vendor/autoload.php';

$dbms='mysql';     // Database type 
$host='127.0.0.1'; // Database host name 
$dbName='employees';    // Database used 
$user='root';      // Database connection user name 
$pass='123456';          // Corresponding password 
$dsn="$dbms:host=$host;dbname=$dbName";
// By default, this is not a long connection , If you need a long database connection , You need to add one last parameter ：array(PDO::ATTR_PERSISTENT => true)  It's like this ：
$dbh = new \PDO($dsn, $user, $pass, array(PDO::ATTR_PERSISTENT => true));




ini_set('memory_limit','1024M');
set_time_limit(0);

$config = [
    'path' =>  './',
];
$excel  = new \Vtiful\Kernel\Excel($config);
// Init File
$fileName   = 'emp.xlsx';
// Fixed memory mode 
$excel = $excel->constMemory($fileName, 'sheet11');
$excel = $excel->header([ 'id', 'salary', 'first_name', 'last_name']);
for($i=5000;$i<=1000000;$i+=5000){
    
    $start = $i-5000;
    $limit = 5000;
    $sql = "SELECT * FROM salaries order by emp_no asc limit {
      $start},{
      $limit}";
    //$sql = 'SELECT * FROM employees order by emp_no asc limit 10';
    //var_dump($sql);die();
    //$sql = "SELECT * FROM salaries limit 10";
    $sth = $dbh->prepare($sql, array(PDO::ATTR_CURSOR => PDO::CURSOR_FWDONLY));
    $sth->execute();
    $emps = $sth->fetchAll(PDO::FETCH_NUM);
    //var_dump(count($emps));die();
    //var_dump($emps);die();
    $excel = $excel->data($emps);
}

// Output
$filePath = $excel->output();

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result

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Reference article ：http://www.884358.com/php-xlswriter
Document address ：https://xlswriter-docs.viest.me/zh-cn/an-zhuang/