使用php上传后如何重命名文件名？

Question

如何在文件上传之前或之后重命名文件？我只想重命名文件名，而不是扩展名。

$changeTXT = $_SESSION['username'];
$uploaderName = strtolower($changeTXT);
$changeTXT = strtolower($changeTXT);
$changeTXT = ucfirst($changeTXT);
$filelocation = $_POST['userfile'];
$filename = $_POST['filename'];
$max_size = $_POST['MAX_FILE_SIZE'];

$file = $_FILES['userfile'];

$allowedExtensions = array("wma", "mp3", "wav");

function isAllowedExtension($fileName) {
  global $allowedExtensions;

  return in_array(end(explode(".", $fileName)), $allowedExtensions);
}

if($file['error'] == UPLOAD_ERR_OK) {
  if(isAllowedExtension($file['name'])) {

$uploaddir = "uploads/".$uploaderName."/";

$uploadfile = $uploaddir . basename($_FILES['userfile']['name']);

if (move_uploaded_file($_FILES['userfile']['tmp_name'], $uploadfile)) {

    echo "Thank you for uploading your music!<br /><br />";

} else {

    echo "Your file did not upload.<br /><br />";

}

    echo "\n";

    echo "<a href='index.php'>Return</a> to index.<br /><br />$uploaddir";

} else {

    echo "You have tried to upload an invalid file type.<br /><br />";

  }

} else die("Cannot upload");

Answer 1

我建议您查看 Verot 的文件上传课程。它解决了通过 php 上传文件的许多痛苦，并使您的代码更具可读性/可维护性。

这是link to the class 和文档。

关于您问题的准确答案： 要为上传的文件指定新名称，请将其作为 move_uploaded_file() 函数的第二个参数。

既然要保留扩展，就先把它存储在一个变量中：

$ext = explode('.',$_FILES['uploaded']['name']);
$extension = $ext[1];

您可以使用文件根名称来生成新名称（此处附加时间戳）：

$newname = $ext[0].'_'.time();

假设你上传了一个文件，你的表单输入变量名是“myfile.png”，它会变成“myfile_2343544.png”；

现在，结合目标目录的本地路径、$newname 变量和文件扩展名来设置函数的第二个参数：

$full_local_path = 'path/to/your/filefolder/'.$newname.'.'.$extension ;
move_uploaded_file($_FILES['uploaded']['tmp_name'], $full_local_path);

Answer 2

    <?php

  /*
     Just change the $path variable to your uploads path
     and dont forget the  / at the end of the  path.

     The way this function works is .When the user submits the form
     the uniqueFilename() function checks to see if there is a filename
     in your uploads folder, that has the same name as the one you intend
     to upload. If it finds a filename that has the same name as the one you want to
     upload it goes through the next steps


        Step 1

    strrpos($arg1,$arg2) - we use it to find the location where upload path ends and where the filename begins

    $arg1 = the filepath including the filename ex. uploads/myFile.jpg
    $arg2 = basename($filename); what this does is it  strips the path from the string and returns only the filename.

    When we use strrpos($arg1,$arg2) we basically tell the function to find the position of the path and exclude the filename

    Step 2

    substr($arg1,$arg2,$arg3) - looks in a string and extrats only the parts from the string that you want. We use it now to extract the uploads path.

    $arg1 = the full path of the uploaded file. ex. uploads/myFile.jpg
    $arg2 = 0  because we want to start from the begginning of the string
    $arg3 = $pathlocation which is the location of where the uploadpath ends and the file beggins

    when we use substr() here we intend to extract the uploads path.

    Step 3

    basename($arg1) strips out a path and returns the filename

    - we use this to save the original filename

    Notice that so far we have the path to the files saved and also
    the filename with its extension. We also have the file extension (.jpg|.png) or whatever


    Step 4

    pathinfo() - extracts the extension from the filename

    Step 5

    we us strrpos() to find the location of the last dot ( . ) in the filename because in step 6
    we use this location to cut the string where the dot ( . ) is

    Step 6

    substr() gets the file without the extension

    Step 7
    substr() takes the filename without extension and clips out the last charcter
    so if the filename is myFile this function would return myFil

    Step 8
    substr() again we use it to save the last character of the file so
                if our file is called myFile it would return e.

    Step 9
    Here we check to see if the last character of our file is numeric.
    Why do this? Because if the last character of a file is numeric we can just add a number to the
    file and end up with a new file with an added number so our file is
    myFile1 the 1 is numeric so our intention is to add to it
    so my myFile1 would end up being myFile2. But what happens if our last character is not numeric?

    then we just add -1 to the file so that myFile would end up being myFile-1

    Step 10
    Since our filename exists in the database we must call the function uniqueFilename() again so that we can
    check and see if the new name exists in the database.

    This function basically keeps calling itself until it finds a filename that does not exists.
   */





    if(isset($_POST['submit'])){

    $path = "uploads/";

    $fullPath = $path.$_FILES['uploadFile']['name'];
    $full_local_path = $path.uniqueFilename($fullPath) ;
    move_uploaded_file($_FILES['uploadFile']['tmp_name'], $full_local_path);
    }
          /*
             * Function returns a unique filename
             * Param 1 is the path of the filename and the filename
             * returns filename with no path
             */
            function uniqueFilename($filepathAndFilename){

                // check to see if file exists
                if (file_exists($filepathAndFilename))
                {
                        /* step 1 */

                    //Get the path location without the basename
                  $filePathWithoutFilenameLocationInString = strrpos($filepathAndFilename,basename($filepathAndFilename));

                        /* step 2 */

                    //Get the path and cut the basename
                    $path = substr($filepathAndFilename,0,$filePathWithoutFilenameLocationInString);

                        /* Step 3*/
                    //Get the base filename
                    $filename = basename($filepathAndFilename);

                       /* Step 4 */
                       // get the extension
                    $fileExtension = pathinfo($filename, PATHINFO_EXTENSION);

                        /* Step 5 */
                    // find the position of the last dot
                    $dotLocation = strrpos($filename,'.');

                        /* Step 6 */
                    // Get the filename without the dot
                    $fileWithNoExtension = substr($filename,0,$dotLocation);

                        /* Step 7 */
                    //Get the name without the last character
                    $filenameMinusLastCharacter = substr($fileWithNoExtension,0,-1);

                       /* Step 8 */
                    //save the last character
                    $lastFilenameCharacter = substr($fileWithNoExtension,-1);

                        /* Step 9*/
                    //if the last character is numeric add 1
                    if (is_numeric($lastFilenameCharacter))
                    {
                        $newFilename = $path.$filenameMinusLastCharacter.($lastFilenameCharacter+1).'.'.$fileExtension;
                        //recursively call itself

                         /* Step 10*/
                        $results = uniqueFilename($newFilename);
                        return basename($results);
                    }else{

                        // if the last character is not numeric then add 1
                        $newFilename = $path.$fileWithNoExtension.'-1'.'.'.$fileExtension;

                            /* Step 10*/
                        //recursively call itself
                        $results = uniqueFilename($newFilename);
                        return basename($results);
                    }

                }
                return basename($filepathAndFilename);

            }
    ?>

    <!doctype html>
    <html>
    <head>
    <meta charset="UTF-8">
    <title>Untitled Document</title>
    </head>

    <body>

    <form method="post" enctype="multipart/form-data"/>
    <label>Upload File</label>
    <input type="file" name="uploadFile"/>
    <input type="submit" name="submit" value="submit"/>
    </form>

    </body>
    </html>`enter code here`

Answer 3

您可以使用 move_uploaded_file 中的第二个参数来设置文件名。第一个参数是 /tmp 文件夹中文件的文件名，第二个参数是文件目录和新文件名。

move_uploaded_file($_FILES['file']['tmp_name'], "/new/file/dir/".[the new file name]);

我知道这是一个老问题，但没有明确的答案。

Answer 4

为什么不使用不同的名称保存它：

只需更改 $uploadfile 变量的名称：

$uploadfile = $uploaddir . "somefilename" . end(explode(".", $file['name']));

但是，如果您稍微重构一下代码，这不会有什么坏处。

Answer 5

当你这样做时

$uploadfile = $uploaddir . basename($_FILES['userfile']['name']);

if (move_uploaded_file($_FILES['userfile']['tmp_name'], $uploadfile)) {

只需将 $uploadfile 设置为所需文件名的整个路径即可；即“上传/mynewfilename.jpg”

Answer 6

使用move_uploaded_file 时，您可以选择文件名，因此您可以选择任何您想要的。

当您上传文件时，它会被放入一个临时目录，并使用临时名称move_uploaded_file() 允许您移动该文件，并且您还需要设置该文件的名称。