PHP从MySQL导出CSV

Question

我有应该从数据库导出.csv文件的脚本。 问题是它将保存导出到特定的（$ f）文件，但不会下载正确的文件（脚本下载空文件）

    <?php
//load the database configuration file
include '../secure/db_connect.php';

//get records from database

$sql_list = "SELECT * FROM `hakom` ORDER BY id DESC";
$sql_list_result = $mysqli->query($sql_list);



if($sql_list_result->num_rows > 0){
    $delimiter = ",";
    $filename = "members_" . date('Y-m-d') . ".csv";

    //create a file pointer
    $f = fopen('hakom_export.csv', 'w');

    //set column headers
    $fields = array('ID', 'MSISDN_');
    fputcsv($f, $fields, $delimiter);

    //output each row of the data, format line as csv and write to file pointer
    while($row = $sql_list_result->fetch_assoc()){

        $lineData = array($row['ID'], $row['MSISDN_']);
        fputcsv($f, $lineData, $delimiter);
    }

    //move back to beginning of file
    fseek($f, 0);

    //set headers to download file rather than displayed
    header('Content-Type: text/csv');
    header('Content-Disposition: attachment; filename="' . $filename . '";');

    //output all remaining data on a file pointer
    fpassthru($f);
}
exit;

?>

我遵循此页面上的教程

Answer 1

您打开的文件仅供写...

$f = fopen('hakom_export.csv', 'w');

从fopen手册页...

w只开放写作； 将文件指针放在文件的开头，并将文件截断为零长度。 如果该文件不存在，请尝试创建它。

将模式更改为w +

$f = fopen('hakom_export.csv', 'w+');

'w +'开放供阅读和写作； 将文件指针放在文件的开头，并将文件截断为零长度。 如果该文件不存在，请尝试创建它。

Answer 2

试试这个代码。

  <?php

// output headers so that the file is downloaded rather than displayed
header('Content-Type: text/csv; charset=utf-8');
header('Content-Disposition: attachment; filename=data.csv');

// create a file pointer connected to the output stream
$output = fopen('php://output', 'w');

// output the column headings
fputcsv($output, array('Column 1', 'Column 2', 'Column 3'));

// fetch the data
mysql_connect('localhost', 'username', 'password');
mysql_select_db('database');
$rows = mysql_query('SELECT field1,field2,field3 FROM table');

// loop over the rows, outputting them
while ($row = mysql_fetch_assoc($rows)) fputcsv($output, $row);


?>