Question

我在自己的网站上工作，用户可以按下载按钮并下载音乐文件。用户选择文件格式如下：

<div id="choose_format"><p>Select Download Format:</p>
    <select id='download_format' name="download_format">
        <option value="1">--SELECT--</option>
        <option value="m4r">M4r (Apple iPhone)</option>
        <option value="mp3">Mp3 (Android)</option>
    </select>
</div>

然后他们按下一个下载按钮，这是单击下载按钮时调用的功能：

function download(song_id){
        var download_format = document.getElementById('download_format').value;
        if(download_format == '1'){
        alert("Please select a download format from the dropdown menu");
        $('#download_format').addClass('highlight_box');
        }else{

        var product_id = 'productID' + song_id;
        var productID = document.getElementById(product_id).value;

        window.location.href = "download_tone3.php?download_format=" + download_format + "&productID=" + productID;
        //xmlhttp_down = createXHR();
        //xmlhttp_down.onreadystatechange = down_callback;
        //xmlhttp_down.open("POST", "download_tone3.php" ,true);
        //xmlhttp_down.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
        //xmlhttp_down.send("download_format=" + download_format + "&productID=" + productID);

        }


}

在download_tone3.php中我想连接到我的音乐数据库，这样我就可以将音乐文件的产品ID与数据库进行比较，以检索正确的下载链接。所以我有以下php文件download_tone3.php：

<?php
require ("../../identity/music_connect.php");
$productID = $_REQUEST['productID'];
$download_format = $_REQUEST['download_format'];
$GLOBALS['download_link'] = '';
$result = mysqli_query($con,"SELECT * FROM products WHERE ProductID=" . $productID);
        if (!$result) {
            printf("Error: %s\n", mysqli_error($con));
            exit();
            }
while($row = mysqli_fetch_array($result)){  
    if($download_format == 'm4r'){
        $GLOBALS['download_link'] = $row['Productm4r'];
    }else if($download_format == 'mp3'){
        $GLOBALS['download_link'] = $row['Productmp3'];
    }
}

$mimeTypes = array(
    'mp3' => 'audio/mpeg',
    'm4r' => 'audio/x-m4r',
);
// set the file here (best of using a $_GET[])
$file = "../" . $GLOBALS['download_link'];

//gets the extension of the file to be loaded for searching array above
$ext = explode('.', $file);
$ext = end($ext);

// gets the file name to send to the browser to force download of file
$fileName = explode("/", $file);
$fileName = end($fileName);

// opens the file for reading and sends headers to browser
$fp = fopen($file,"r") ;
header("Content-Type: ".$mimeTypes[$ext]);
header('Content-Disposition: attachment; filename="'.$fileName.'"');

// reads file and send the raw code to browser     
while (! feof($fp)) {
        $buff = fread($fp,4096);
    echo $buff;
        //file_put_contents('media/audio/ringtones/anthem-sarah_monks.' . $download_format,$buff);
}
// closes file after whe have finished reading it

fclose($fp);

//mysqli_close($con);
?>

这个php文件非常适合强制下载文件，直到我试图要求另一个php文件并使用数据库。它抛出一个错误：＆＃34;无法修改标题信息 - 已经发送的标题（输出开始于/home4/monksee/identity/music_connect.php:15)"谢谢你的帮助。

Answer 1

你的/music_connect.php是echo / print的东西。看看这个。

强制下载文件php错误无法修改头信息

1 个答案: