Question

我正在使用PHP表单POST，它将数据（放入文本文件）放入我的SQL数据库，然后代码创建一个唯一的下载链接，以便能够从SQL数据库下载Text文件。与SQL数据库的连接完美无缺。
但我得到的只是＆＃34;我们无法找到要下载的文件。＆＃34;

Form（index.php），我输入要输入到文本文件的数据

    <form action="index2.php" method="POST">
    <input name="field1" type="text" />
    <input name="field2" type="text" />
    <input type="submit" name="submit" value="Save Data">
   </form>

Index2.php（这将创建文本文件并从表单中插入详细信息。它还会创建唯一的下载链接以下载文件。）

<?php
if(isset($_POST['field1']) && isset($_POST['field2'])) {
    $data = $_POST['field1'] . '-' . $_POST['field2'] . "\n";
    $ret = file_put_contents('/tmp/mydata.txt', $data, FILE_APPEND | LOCK_EX);
}
else {
   die('no post data to process');
}
?>


<?php

//connect to the DB
$resDB = mysql_connect("xxx", "xxx", "xxx");
mysql_select_db("xxx", $resDB);

function createKey(){
    //create a random key
    $strKey = md5(microtime());

    //check to make sure this key isnt already in use
    $resCheck = mysql_query("SELECT count(*) FROM downloads WHERE downloadkey = '{$strKey}' LIMIT 1");
    $arrCheck = mysql_fetch_assoc($resCheck);
    if($arrCheck['count(*)']){
        //key already in use
        return createKey();
    }else{
        //key is OK
        return $strKey;
    }
}

//get a unique download key
$strKey = createKey();

//insert the download record into the database
mysql_query("INSERT INTO downloads (downloadkey, file, expires) VALUES ('{$strKey}', '{$ret}', '".(time()+(60*60*24*7))."')");

?>

<html>
    <head>
        <title>One Time Download Example</title>
    </head>
    <h1>One Time Download Example</h1>
    <p>Your unique download URL is:</p>
    <strong><a href="download.php?key=<?=$strKey;?>">download.php?key=<?=$strKey;?></a></strong>
    <p>This link will allow you to download the source code a single time within the next 7 days.</p>
</html>

最后，download.php检查所有内容并从数据库下载文本文件。

<?php

//The directory where the download files are kept - keep outside of the web document root
$strDownloadFolder = "/downloads/";

//If you can download a file more than once
$boolAllowMultipleDownload = 0;

//connect to the DB
$resDB = mysql_connect("xxx", "xxx", "xxx");
mysql_select_db("xxx", $resDB);

if(!empty($_GET['key'])){
    //check the DB for the key
    $resCheck = mysql_query("SELECT * FROM downloads WHERE downloadkey = '".mysql_real_escape_string($_GET['key'])."' LIMIT 1");
    $arrCheck = mysql_fetch_assoc($resCheck);
    if(!empty($arrCheck['file'])){
        //check that the download time hasnt expired
        if($arrCheck['expires']>=time()){
            if(!$arrCheck['downloads'] OR $boolAllowMultipleDownload){
                //everything is hunky dory - check the file exists and then let the user download it
                $strDownload = $strDownloadFolder.$arrCheck['file'];

                if(file_exists($strDownload)){

                    //get the file content
                    $strFile = file_get_contents($strDownload);

                    //set the headers to force a download
                    header("Content-type: application/force-download");
                    header("Content-Disposition: attachment; filename=\"".str_replace(" ", "_", $arrCheck['file'])."\"");

                    //echo the file to the user
                    echo $strFile;

                    //update the DB to say this file has been downloaded
                    mysql_query("UPDATE downloads SET downloads = downloads + 1 WHERE downloadkey = '".mysql_real_escape_string($_GET['key'])."' LIMIT 1");

                    exit;

                }else{
                    echo "We couldn't find the file to download.";
                }
            }else{
                //this file has already been downloaded and multiple downloads are not allowed
                echo "This file has already been downloaded.";
            }
        }else{
            //this download has passed its expiry date
            echo "This download has expired.";
        }
    }else{
        //the download key given didnt match anything in the DB
        echo "No file was found to download.";
    }
}else{
    //No download key wa provided to this script
    echo "No download key was provided. Please return to the previous page and try again.";
}

?>

PHP Post to SQL数据库下载文件错误

0 个答案: