PHP文件上传 [英] PHP File Upload

问题描述

如果我想在将文件名更改为永久位置的服务器之前更改我的文件名，而不是它的临时位置，我该如何执行此操作。

代码如下：

 < form action = upload_file.phpmethod =post
 enctype =multipart / form-data> 
< label for =file>档案名称：< / label> 
< input type =filename =fileid =file/> 
< br /> 
< input type =submitname =submitvalue =Submit/> 
< / form> （（（$ _FILES [file] [type] ==image / gif）
 
 
<？php 
 （$ _FILES [file] [type] ==image / jpeg）
 ||（$ _FILES [file] [type] ==image / pjpeg））
&&（$ _FILES [file] [size]< 20000））
 {
 if（$ _FILES [file] [error]> 0）
 {
 echo返回代码：。 $ _FILES [file] [error]。 < br />; 
} 
 else 
 {
 echoUpload：。 $ _FILES [file] [name]。 < br />; 
回显类型：。 $ _FILES [file] [type]。 < br />; 
回声大小：。 （$ _FILES [file] [size] / 1024）。 Kb< br />; 
回显Temp file：。 $ _FILES [file] [tmp_name]。 < br />; 
 
 if（file_exists（upload /。$ _FILES [file] [name]））
 {
 echo $ _FILES [file] [名称] 。  已经存在。 ; 
} 
 else 
 {
 move_uploaded_file（$ _ FILES [file] [tmp_name]，
upload /。$ _FILES [file] [名称]）; 
回声存储于：。 上传/。 $ _FILES [ 文件] [ 名称]; 
} 
} 
} 
 else 
 {
 echo文件无效; 
} 
？> 
  

解决方案

我不确定我是否理解您的意思。如果您只是想在将文件存储到upload目录时重命名文件，请在使用 move_uploaded_file（）时执行此操作：

  $ destination =upload /。 $ new_filename; 
 if（file_exists（$ destination））{
 echo'File'，$ destination，'already exists！'; 
} else {
 move_uploaded_file（$ temp_filename，$ destination）; 
} 
  

您也可以让用户定义 $ new_filename ，方法是在HTML表单中提供一个额外的重命名文本字段。

---

编辑：代码可以是这样的：

表单：

 < form action =upload_file.phpmethod =post
 enctype =multipart / form-data> 
< label for =file>档案名称：< / label> 
< input type =filename =fileid =file/> 
< br /> 
 
 <！ -  NEW TEXTBOX  - > 
< label for =newname>重命名为（可选）：< / label> 
< input type =textname =newnameid =newname/> 
< br /> 
 
< input type =submitname =submitvalue =Submit/> 
< / form> 
  

PHP：

  $ upload_dir = realpath（'upload'）。 DIRECTORY_SEPARATOR; 
 $ file_info = $ _FILES ['file']; 
 
 //检查用户是否要求重命名上传文件
 if（！empty（$ _ POST ['newname']））{
 $ new_filename = $ _POST ['新名字']; 
} else {
 $ new_filename = $ file_info ['name']; 
} 
 
 //确保文件名是有效的。 
 if（strpos（$ new_filename，'/'）！== false || strpos（$ new_filename，'\\\'）！== false）{
 // We * have * to确保用户不能将文件保存在$ upload_dir的
之外，所以我们不允许使用斜杠。 
 //注意：您应该在这里进行更严格的检查！ 
 die（无效的文件名）; 
} 
 
 $ destination = $ upload_dir。 $ new_filename; 
 // ... if（file_exists（... move_uploaded_file（... 
  

If I want to change my filename before it goes to the server for its permanent location, not its temporary Location how could I do this.

The code is as followed:

<form action="upload_file.php" method="post"
enctype="multipart/form-data">
<label for="file">Filename:</label>
<input type="file" name="file" id="file" /> 
<br />
<input type="submit" name="submit" value="Submit" />
</form>


<?php
if ((($_FILES["file"]["type"] == "image/gif")
|| ($_FILES["file"]["type"] == "image/jpeg")
|| ($_FILES["file"]["type"] == "image/pjpeg"))
&& ($_FILES["file"]["size"] < 20000))
  {
  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"];
      }
    }
  }
else
  {
  echo "Invalid file";
  }
?>

解决方案

I'm not sure if I understand what you mean. If you just want to rename the file when storing it in the "upload" directory, do so when using move_uploaded_file():

$destination = "upload/" . $new_filename;
if (file_exists($destination)) {
    echo 'File ', $destination, ' already exists!';
} else {
    move_uploaded_file($temp_filename, $destination);
}

You could also let the user define $new_filename by providing an additional "rename" text field in your HTML form.

---

EDIT: Code could be something like that:

Form:

<form action="upload_file.php" method="post"
    enctype="multipart/form-data">
<label for="file">Filename:</label>
<input type="file" name="file" id="file" /> 
<br />

<!-- NEW TEXTBOX -->
<label for="newname">Rename to (optional):</label>
<input type="text" name="newname" id="newname" /> 
<br />

<input type="submit" name="submit" value="Submit" />
</form>

PHP:

$upload_dir = realpath('upload') . DIRECTORY_SEPARATOR;
$file_info = $_FILES['file'];

// Check if the user requested to rename the uploaded file
if (!empty($_POST['newname'])) {
    $new_filename = $_POST['newname'];
} else {
    $new_filename = $file_info['name'];
}

// Make sure that the file name is valid.
if (strpos($new_filename, '/') !== false || strpos($new_filename, '\\') !== false) {
    // We *have* to make sure that the user cannot save the file outside
    // of $upload_dir, so we don't allow slashes.
    // ATTENTION: You should do more serious checks here!
    die("Invalid filename");
}

$destination = $upload_dir . $new_filename;
// ... if (file_exists(... move_uploaded_file(...

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