php程式碼生成txt檔案並下載

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<?php
    header("Content-Type: application/octet-stream");
       
    $quan=$_GET[`quan`];
    $ua = $_SERVER["HTTP_USER_AGENT"];
    $filename = "100yuan.txt";
    $encoded_filename = urlencode($filename);
    $encoded_filename = str_replace("+", "%20", $encoded_filename);
       
    if (preg_match("/MSIE/", $_SERVER[`HTTP_USER_AGENT`]) ) {
        header(`Content-Disposition:  attachment; filename="` . $encoded_filename . `"`);
    } elseif (preg_match("/Firefox/", $_SERVER[`HTTP_USER_AGENT`])) {
       // header(`Content-Disposition: attachment; filename*="utf8` .  $filename . `"`);
        header(`Content-Disposition: attachment; filename*="` .  $filename . `"`);
    } else {
        header(`Content-Disposition: attachment; filename="` .  $filename . `"`);
    }
       
    echo `您已領取100元現金券。現金券編碼是：`.$quan;
?>