已经很好的解决了。我只是把全部代码放进去，这样新手就能得到全部帮助

<?php
extract($_GET); //you can send some parameter by query variable. I have sent table name in *table* variable

header("Content-type: text/csv");
header("Content-Disposition: attachment; filename=$table.csv");
header("Pragma: no-cache");
header("Expires: 0");

require_once("includes/functions.php"); //necessary mysql connection functions here

//first of all I'll get the column name to put title of csv file.
$query = "SHOW columns FROM $table";
$headers = mysql_query($query) or die(mysql_error());
$csv_head = array();
while ($row = mysql_fetch_array($headers, MYSQL_ASSOC))
{
    $csv_head[] =  $row['Field'];
}
echo implode(",", $csv_head)."\n";

//now I'll bring the data.
$query = "SELECT * FROM $table";
$select_c = mysql_query($query) or die(mysql_error()); 

while ($row = mysql_fetch_array($select_c, MYSQL_ASSOC))
{
    foreach ($row as $key => $value) {
            //there may be separator (here I have used comma) inside data. So need to put double quote around such data.
        if(strpos($value, ',') !== false || strpos($value, '"') !== false || strpos($value, "\n") !== false) {
            $row[$key] = '"' . str_replace('"', '""', $value) . '"';
        }
    }
    echo implode(",", $row)."\n";
}

?>

我已将此代码保存在csv-download.php中

现在看看我是如何使用这些数据来下载csv文件的

<a href="csv-download.php?table=tbl_vfm"><img title="Download as Excel" src="images/Excel-logo.gif" alt="Download as Excel" /><a/>

因此，当我点击链接，它下载文件，而不带我到浏览器上的csv-download.php页面。

<?
    // Connect to database
    $result = mysql_query("select id
    from tablename
    where shid=3");
    list($DBshid) = mysql_fetch_row($result);

    /***********************************
    Write date to CSV file
    ***********************************/

    $_file = 'show.csv';
    $_fp = @fopen( $_file, 'wb' );

    $result = mysql_query("select name,compname,job_title,email_add,phone,url from UserTables where id=3");

    while (list( $Username, $Useremail_add, $Userphone, $Userurl) = mysql_fetch_row($result))
    {
        $_csv_data = $Username.','.$Useremail_add.','.$Userphone.','.$Userurl . "\n";
        @fwrite( $_fp, $_csv_data);
    }
    @fclose( $_fp );
?>

公共函数actionExportnotificationresponselogdata() {

    $fileName = '/tmp/notificationresponselogs_' . date('d-m-Y-g-i-h') . '.csv';
    $f = fopen($fileName, 'w'); 
     fputs( $f, "\xEF\xBB\xBF" ); //for utf8 support in csv



        $csv_fields=array();
        $csv_fields[] = 'heading1';
        $csv_fields[] = 'heading2';
        $csv_fields[] = 'heading3';
        $csv_fields[] = 'heading4';
        $csv_fields[] = 'heading5';
        $csv_fields[] = 'heading6';
        $csv_fields[] = 'heading7';
        $csv_fields[] = 'heading8';
        fputcsv($f, $csv_fields);

    
$notification_log_arr = $notificationObj->getNotificationResponseForExport($params); //result from database

    if (count($notification_log_arr) > 0) {
        $serialNumber=1;
    foreach ($notification_log_arr AS $notifaction) {
            

            $fields = array();
            $fields['serialNumber']= $serialNumber  ;
            $fields['fld_1']= $notifaction['fld_1'] ;
            $fields['fld_2']= $notifaction['fld_2'] ;
            $fields['fld_3']= $notifaction['fld_3'] ;
            $fields['fld_4']= $notifaction['fld_4'] ;
            $fields['fld_5']= $notifaction['fld_5'] ;
            $fields['fld_6']= $notifaction['fld_6'] ; 
            $fields['fld_7']= $notifaction['fld_7'] ; 
           // print_r($fields); die;
            fputcsv($f, $fields,",");
        
            $serialNumber++;  }
            fclose($f);
            if (file_exists($fileName)) {
                
                header("Content-type: application/csv");
                header("Content-Disposition: attachment; filename="."exportlog".date("Y-m-d_H:i").".csv");
                header("Content-length: " . filesize($fileName));
                header("Pragma: no-cache"); 
                header("Expires: 0");
                readfile($fileName);
                unlink($fileName);
                exit;
            }
}

创建您的文件，然后用正确的标题返回对它的引用，以触发另存为-根据需要编辑以下内容。将您的CSV数据放入$csvdata。

$fname = 'myCSV.csv';
$fp = fopen($fname,'wb');
fwrite($fp,$csvdata);
fclose($fp);

header('Content-type: application/csv');
header("Content-Disposition: inline; filename=".$fname);
readfile($fname);

下面是@Andrew发布的php.net函数的改进版本。

function download_csv_results($results, $name = NULL)
{
    if( ! $name)
    {
        $name = md5(uniqid() . microtime(TRUE) . mt_rand()). '.csv';
    }

    header('Content-Type: text/csv');
    header('Content-Disposition: attachment; filename='. $name);
    header('Pragma: no-cache');
    header("Expires: 0");

    $outstream = fopen("php://output", "wb");

    foreach($results as $result)
    {
        fputcsv($outstream, $result);
    }

    fclose($outstream);
}

它真的很容易使用，并且与MySQL(i)/PDO结果集一起工作。

download_csv_results($results, 'your_name_here.csv');

如果完成了页面，请记住在调用此函数后退出()。

我知道这个帖子有点老了，但作为将来的参考，以及像我这样的新手:

这里的其他人都解释了如何创建CSV，但忽略了问题的基本部分:如何链接。为了链接到CSV-file的下载，只需链接到.php-file，该文件将响应为. CSV-file。PHP头文件可以做到这一点。这可以实现一些很酷的东西，比如向查询字符串中添加变量并自定义输出:

<a href="my_csv_creator.php?user=23&amp;othervariable=true">Get CSV</a>

my_csv_creator.php可以使用查询字符串中给出的变量，例如使用不同的或自定义的数据库查询，更改CSV的列，个性化文件名等，例如:

User_John_Doe_10_Dec_11.csv