php读取csv实现csv文件下载功能

第一段是读文件，下载。
第二段是字符串下载。

复制代码 代码如下:
<?php
$fileName = "prefs.csv";
header("Content-Type: application/octet-stream");
header("Content-Disposition: attachment; filename=" . $fileName);
header("Content-Transfer-Encoding: binary");
header("Content-Length: " . filesize($fileName));
readfile($fileName);

复制代码 代码如下:
<?php
$fileName = "pref_" . date("YmdHis") . ".csv";
header("Content-Type: application/octet-stream");
header("Content-Disposition: attachment; filename=" . $fileName);
echo $csv;