PHP图像上传奇怪的问题

Posted 2023-03-22

【中文标题】PHP图像上传奇怪的问题

【英文标题】：PHP Image Upload Strange Issue

【发布时间】：2012-04-15 07:27:06

【问题描述】：

<?
if(isset($_POST['submit']))

$url = 'http://www.connectedcampus.org/ckeditor/images/uploads/';

if (($_FILES['upload'] == "none") OR (empty($_FILES['upload']['name'])) )

   $message = "No file uploaded.";

else if ($_FILES['upload']["size"] == 0)

   $message = "The file is of zero length.";

else if (($_FILES['upload']["type"] != "image/pjpeg") AND ($_FILES['upload']["type"] != "image/jpeg") AND ($_FILES['upload']["type"] != "image/png"))

   $message = "The image must be in either JPG or PNG format. Please upload a JPG or PNG instead.";

else if($_FILES["file"]["size"] > 1000000)
    $message = "File size too big!";

else if(file_exists($url.$_FILES["file"]["name"]))
  
  $message=$_FILES["file"]["name"] . " already exists. ";
  
else if (!is_uploaded_file($_FILES['upload']["tmp_name"]))

   $message = "Invalid File!";

else 
  $message = "success!";
  $move = move_uploaded_file($_FILES['upload']['tmp_name'], $url.$_FILES['upload']['name']);
  echo $_FILES['upload']['tmp_name']."<br>";
  echo $url.$_FILES['upload']['name'];
  if(!$move)
  
     $message = "Error moving uploaded file.";
  
  $url = $url.$_FILES['upload']['name'];

 echo $message;
 </script>";
 
 ?>

这会打印“移动上传的文件时出错” 这意味着 move_uploaded_file($_FILES['upload']['tmp_name'], $url.$_FILES['upload']['name']) 返回假。但是我 500% 确定我已经正确创建了 http://www.connectedcampus.org/ckeditor/images/uploads/ 文件夹......那为什么会出现错误？

好的，现在改为：

$url = 'bloguploads/';

    if (($_FILES['upload'] == "none") OR (empty($_FILES['upload']['name'])) )
    
       $message = "No file uploaded.";
    
    else if ($_FILES['upload']["size"] == 0)
    
       $message = "The file is of zero length.";
    
    else if (($_FILES['upload']["type"] != "image/pjpeg") AND ($_FILES['upload']["type"] != "image/jpeg") AND ($_FILES['upload']["type"] != "image/png"))
    
       $message = "The image must be in either JPG or PNG format. Please upload a JPG or PNG instead.";
    
else if($_FILES["file"]["size"] > 1000000)
       $message = "File size too big!";

else if(file_exists($url.$_FILES["file"]["name"]))
    
       $message=$_FILES["file"]["name"] . " already exists. ";
    
    else if (!is_uploaded_file($_FILES['upload']["tmp_name"]))
    
       $message = "Invalid File!";
    
    else 
       $message = "";
       $move = move_uploaded_file($_FILES['upload']['tmp_name'], $url.$_FILES['upload']['name']);
       if(!$move)
       
           $message = "Error moving uploaded file.";
       
       $url = $url.$_FILES['upload']['name'];
       
echo $message;
</script>";
?>

现在问题是，它说“已经存在”。为什么？通过ftp客户端可以看到文件没有上传

【问题讨论】：

读/写权限可能吗？

@hjpotter92 chmod($_FILES['upload']['tmp_name'], 777); $message = "成功！"; $move = move_uploaded_file($_FILES['upload']['tmp_name'], $url.$_FILES['upload']['name']);并更改了上传文件夹的权限......没有任何作用

它说“已经存在”而不是“Filename.jpg 已经存在”的事实应该是一个提示......

【参考方案1】：

move_uploaded_file 适用于文件系统，而不适用于 url。

而不是$url

move_uploaded_file($_FILES['upload']['tmp_name'], $url.$_FILES['upload']['name']);

使用文件系统路径，即：

move_uploaded_file($_FILES['upload']['tmp_name'], "/home/www/uploads/".$_FILES['upload']['name']);

【讨论】：

$url = '/ckeditor/images/uploads/';仍然显示上传文件错误！ :-/

如果您尝试使用相对路径，请从开头删除/。但更好的办法是花一些时间了解绝对/相对路径、当前工作目录以及如何在 php 中处理它们。

查看上述问题中的编辑。我更正了路径。现在非常奇怪的是它说“已经存在”

尝试在你的 ftp 客户端刷新文件列表，也许它已经存在了。此外，您应该使用自己的文件名（将空格更改为下划线，添加上传时间戳等）并在尝试将文件移动到上传文件夹之前检查文件是否存在。