PHP上传下载文件源码

  index.php
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    <html xmlns=".w3.org/1999/xhtml">
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>filelist</title>
    </head>
    <body>
    <form action="upload_file.php" method="post"
    enctype="multipart/form-data">
    <label for="file">Filename:</label>
    <input type="hidden" name="max_file_size" value="1000000000">
    <input type="file" name="file" id="file" />
    <input type="submit" name="submit" value="Submit" />
    </form>
    <br/>
    <br/>
    <table width="400" border="1">
    <?php
    $dir = 'upload/';
    if(is_dir($dir)) {
    if ($dh = opendir($dir)) {
    while (($file = readdir($dh)) !== false) {
    if($file!="." && $file!="") {
    echo "<tr><td><a href='".$dir.$file."'>".$file."</a></td></tr>";
    }
    }
    closedir($dh);
    }
    }
    ?>
    </table>
    </body>
    </html>
    ---------------------------------------------------------------------------------------
    upload_file.php
    ----------------------------------------------------------------------------------------
    <?php
    if ($_FILES["file"]["error"] > 0)
    {
    echo "Return Code: " . $_FILES["file"]["error"] . "<br />";
    }
    else
    {
    echo "Upload: " . $_FILES["file"]["name"] . "<br />";
    echo "Type: " . $_FILES["file"]["type"] . "<br />";
    echo "Size: " . ($_FILES["file"]["size"] / 1024) . " Kb<br />";
    echo "Temp file: " . $_FILES["file"]["tmp_name"] . "<br />";
    if (file_exists("upload/" . $_FILES["file"]["name"]))
    {
    echo $_FILES["file"]["name"] . " already exists. ";
    }
    else
    {
    move_uploaded_file($_FILES["file"]["tmp_name"],
    "upload/" . $_FILES["file"]["name"]);
    echo "Stored in: " . "upload/" . $_FILES["file"]["name"];
    }
    }
    header('HTTP/1.1 301 Moved Permanently');
    header('Location:files.php');
    ?>

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