[精选] PHP如何快速导出 百万级数据 到EXCEL

<?php
    //让程序一直运行
    set_time_limit(0);
    //设置程序运行内存
    ini_set('memory_limit', '128M');

    $fileName = '测试导出数据';
    header('Content-Encoding: UTF-8');
    header("Content-type:application/vnd.ms-excel;charset=UTF-8");
    header('Content-Disposition: attachment;filename="' . $fileName . '.csv"');

    //打开php标准输出流
    $fp = fopen('php://output', 'a');

    //添加BOM头，以UTF8编码导出CSV文件，如果文件头未添加BOM头，打开会出现乱码。
    fwrite($fp, chr(0xEF).chr(0xBB).chr(0xBF));
    //添加导出标题
    fputcsv($fp, ['姓名', '年龄', '地区']);

    //链接数据库
    $dsn = "mysql:host=127.0.0.1;port=3306;dbname=db_www;charset=utf8";
    $pdo = new PDO($dsn, 'root', '');

    $step = 100; //循环次数
    $nums = 10000; //每次导出数量

    for($i = 0; $i < $step; $i++) {
        $start = $i * 10000;
        $sql = "SELECT uname,age,city FROM `hd_test` ORDER BY `id` LIMIT {$start},{$nums}";
        $pdostatement = $pdo->query($sql);
        $result = $pdostatement->fetchAll(PDO::FETCH_ASSOC);
        foreach ($result as $item) {
            fputcsv($fp, $item);
        }
        //每1万条数据就刷新缓冲区
        ob_flush();
        flush();
    }

INSERT INTO hd_test (uname,age,city) SELECT uname,age,city FROM hd_test;