Question

我正在编写一个脚本来上传文件作为我的php项目的一部分。如果一个文件已经存在同名，而不是移动文件并覆盖其中的任何内容，我使用header（）刷新页面并添加消息以在上传之前重命名该文件。

但是，它不起作用。无论名称是否已被占用，程序都会移动文件。我测试过了 if(file_exists($_SERVER['DOCUMENT_ROOT'] . "/uploads/" . $_FILES['uploadFile']['name']))它似乎独立工作，但不在我的程序结构中。我无法弄清楚它出了什么问题。

这是我的代码

<?php
include ('includes/openfile.php');

if(isset($_FILES['uploadFile']))
{

$allowed = array('image/JPG', 'image/jpeg', 'image/png', 'text/plain');

// validate the file type
if(in_array($_FILES['uploadFile']['type'], $allowed))
{

    //check if file exists with current file name in order to prevent overwrite -- prevents overwrite .htaccess attack as well as protecting user files
     if(file_exists($_SERVER['DOCUMENT_ROOT'] . "/uploads/" . $_FILES['uploadFile']['name']))
    {
            // file must have a unique name
            header("Location: file-upload.php?msg=" . urlencode(base64_encode("Please rename this file.")));

    }
    else
    {
            // file has unique name, so move it to uploads directory
            move_uploaded_file($_FILES['uploadFile']['tmp_name'], "../uploads/" . $_FILES['uploadFile']['name']);
    }
}
else
{
            header("Location: file-upload.php?msg=" . urlencode(base64_encode("Please upload a .JPG, .jpeg, .png, or .txt file type")));    
}

// check for a file error
if($_FILES['uploadFile']['error'] > 0)
{
 echo "<h1 class='jumbotron error'>There was an error because </h1>";

switch ($_FILES['uploadFile']['error'])
{
    case 1:
        echo "<h2 class='jumbtron'>File exceeds upload max file size</h2>";
        break;
    case 2:
        echo "<h2 class='jumbtron'>File exeeds max file size in html form</h2>";
        break;
    case 3:
        echo "<h2 class='jumbtron'>File was only partially uploadeded</h2>";
        break;
    case 4:
        echo "<h2 class='jumbtron'>No file was uploaded</h2>";
        break;
    case 6:
        echo "<h2 class='jumbtron'>No temporary folder was available</h2>";
        break;
    case 7:
        echo "<h2 class='jumbtron'>Unable to write to the disk</h2>";
        break;
    case 8:
        echo "<h2 class='jumbtron'>File upload stopped</h2>";
        break;


    default:
        echo "<h2 class='jumbtron'>A system error has occured</h2>";
        break;
    }
} 
else
{


# TODO: encrypt uploaded file

// delete tmp file
if(file_exists($_FILES['uploadFile']['tmp_name']) && is_file($_FILES['uploadFile']['tmp_name']))
{
    unlink($_FILES['uploadFile']['tmp_name']);
}

// let the user know the file was succesfully uploaded
header("Location: file-upload.php?success=" . urlencode(base64_encode("File uploaded successfully!")));

}
}


include ('includes/closefile.php');
?>

感谢您的帮助！

file_exists表现不正常

0 个答案: