如何对PHP导出的海量数据进行优化-php教程

导出数据量很年夜的状况下，天生excel的内存需要十分宏大，效劳器吃没有消，这个时分思考天生csv来处理成绩，cvs读写功能比excel高。
测试表student 数据(各人能够剧本拔出300多万测数据。这里只给个简略的示例了)

SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;

-- ----------------------------
-- Table structure for student
-- ----------------------------
DROP TABLE IF EXISTS `student`;
CREATE TABLE `student`  (
  `ID` int(11) NOT NULL AUTO_INCREMENT,
  `StuNo` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
  `StuName` varchar(10) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
  `StuAge` int(11) NULL DEFAULT NULL,
  PRIMARY KEY (`ID`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 12 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Compact;

-- ----------------------------
-- Records of student
-- ----------------------------
INSERT INTO `student` VALUES (1, 'A001', '小明', 22);
INSERT INTO `student` VALUES (2, 'A005', '小李', 23);
INSERT INTO `student` VALUES (3, 'A007', '小红', 24);
INSERT INTO `student` VALUES (4, 'A003', '小明', 22);
INSERT INTO `student` VALUES (5, 'A002', '小李', 23);
INSERT INTO `student` VALUES (6, 'A004', '小红', 24);
INSERT INTO `student` VALUES (7, 'A006', '小王', 25);
INSERT INTO `student` VALUES (8, 'A008', '乔峰', 27);
INSERT INTO `student` VALUES (9, 'A009', '欧阳克', 22);
INSERT INTO `student` VALUES (10, 'A010', '老顽童', 34);
INSERT INTO `student` VALUES (11, 'A011', '黄老邪', 33);

SET FOREIGN_KEY_CHECKS = 1;

导出剧本export.php

<?php
set_time_limit(0);
ini_set('memory_limit', '128M');

$fileName = date('YmdHis', time());
header('Content-Encoding: UTF-8');
header("Content-type:application/vnd.ms-excel;charset=UTF-8");
header('Content-Disposition: attachment;filename="' . $fileName . '.csv"');
//留意，数据量正在年夜的状况下。比方导出几十万到几百万，会呈现504 Gateway Time-out,请修正php.ini的max_execution_time参数
//关上php规范输入流以写入追加的形式关上
$fp = fopen('php://output', 'a');
//衔接数据库
$dbhost = '127.0.0.1';
$dbuser = 'root';
$dbpwd = 'root';
$con = mysqli_connect($dbhost, $dbuser, $dbpwd);
if (mysqli_connect_errno())
    die('connect error');

$database = 'test';//抉择数据库
mysqli_select_db($con, $database);
mysqli_query($con, "set names UTF8");//假如需求请设置编码

//用fputcsv从数据库中导出1百万的数据,比方咱们每一次取1万条数据，分100步来执行
//一次性读取1万条数据，也能够把$nums调小，$step相应增年夜。
$step = 100;
$nums = 10000;
$where = "where 1=1"; //挑选前提,可自行增加
//设置题目
$title = array('id', '编号', '姓名', '春秋'); //留意这里是小写id,不然ID定名关上会提醒Excel 曾经检测到"xxx.xsl"是SYLK文件,然而不克不及将其加载: CSV 文或许XLS文件的前两个字符是年夜写字母"I"，"D"时，会发作此成绩。
foreach ($title as $key => $item)
    $title[$key] = iconv("UTF-8", "GB2312//IGNORE", $item);
fputcsv($fp, $title);
for ($s = 1; $s <= $step; $s++) {
    $start = ($s - 1) * $nums;
    $result = mysqli_query($con, "SELECT ID,StuNo,StuName,StuAge FROM `student` " . $where . " ORDER BY `ID` LIMIT {$start},{$nums}");
    if ($result) {
        while ($row = mysqli_fetch_assoc($result)) {
            foreach ($row as $key => $item)
                $row[$key] = iconv("UTF-8", "GBK", $item); //这里必需转码，否则会乱码
            fputcsv($fp, $row);
        }
        mysqli_free_result($result); //开释后果集资本
        ob_flush();  //每一1万条数据就刷新缓冲区
        flush();
    }
}
mysqli_close($con);//断开衔接

导出成果：

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