<?php

set_time_limit(0);

ini_set('memory_limit', '128M');

$fileName = date('YmdHis', time());

header('Content-Type: application/vnd.ms-execl');

header('Content-Disposition: attachment;filename="' . $fileName . '.csv"');

$begin = microtime(true);

//打开php标准输出流

//以写入追加的方式打开

$fp = fopen('php://output', 'a');

$db = new mysqli("101.132.154.96", "dev", "!2#4QwEr", "crm");

if($db->connect_error) {

    die('connect error');

}

//我们试着用fputcsv从数据库中导出1百万的数据

//我们每次取1万条数据，分100步来执行

//如果线上环境无法支持一次性读取1万条数据，可把$nums调小，$step相应增大。

$step = 15;

$nums = 10000;

//设置标题

// $title = array('ID', '用户名', '用户年龄', '用户描述', '用户手机', '用户QQ', '用户邮箱', '用户地址');

// foreach($title as $key => $item) {

//     $title[$key] = iconv('UTF-8', 'GBK', $item);

// }

//将标题写到标准输出中

fputcsv($fp, $title);

for($s = 1; $s <= $step; ++$s) {

    $start = ($s - 1) * $nums;

    $result = $db->query("SELECT * FROM vtiger_scorecf ORDER BY scoreid LIMIT {$start},{$nums}");

    if($result) {

        while($row = $result->fetch_assoc()) {

            foreach($row as $key => $item) {

                //这里必须转码，不然会乱码

                $row[$key] = iconv('UTF-8', 'GBK', $item);

            }

            fputcsv($fp, $row);

        }

        $result->free();

        //每1万条数据就刷新缓冲区

        ob_flush();

        flush();

    }

}

$end = microtime(true);

echo '用时：', $end - $begin;