<?php

function new_csv($string)

{

    $filename = date('Ymd').'.csv'; //设置文件名

    header("Content-type:text/csv");

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

    header('Cache-Control:must-revalidate,post-check=0,pre-check=0');

    header('Expires:0');

    header('Pragma:public');

    echo $string;

}

$str = 'a,b,c,d,"e"'."\n".'a,b,c,d,e'."\n";

new_csv($str);

<?php

function new_csv($string)

{

    $filename = date('Ymd').'.csv'; //设置文件名

    header("Content-type:text/csv");

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

    header('Cache-Control:must-revalidate,post-check=0,pre-check=0');

    header('Expires:0');

    header('Pragma:public');

    echo $string;

}

$str = 'a,b,c,d,"""e"""'."\n".'a,b,c,d,e'."\n";

new_csv($str);