上傳前重命名並替換多個圖像文件

Question

我有一個上傳腳本，用戶可以通過該腳本將多個圖像上傳並重命名到服務器。 它完美地工作，但我想要的是在重命名每個圖像時應將其命名為1,2,3,4 ..，依此類推，具體取決於所上傳圖像的數量，並且它還應該替換具有相同名稱的先前圖像。 這是我的代碼：

HTML部分：

<form action="upload_file.php" method="post" enctype="multipart/form-data">
    Attachment(s): <input type="file" name="file[]" id="file" maxlength="500" accept="application/pdf,image/*" multiple>
    <input type="submit" name="submit" value="Request">
</form>

upload_file.php

<?php

// config
$upload_dir = 'uploaded_files'; // set your upload dir
$max_size = 1048576; // max file size: 1 MB
$allow_override = FALSE; // allow uploading files overriding existing ones
$valid_exts = array( // allowed extensions
    'gif',
    'jpeg',
    'jpg',
    'png',
    'pdf',
);
$valid_types = array(
    'image/gif',
    'image/jpeg',
    'image/jpg',
    'image/pjpeg',
    'image/x-png',
    'image/png',
    'text/pdf',
    'application/pdf',
);

// reorganize files array
$files = array();
foreach ($_FILES['file'] as $attr => $arr) 
    {
        foreach ($arr as $k => $v) 
            {
                $files[$k][$attr] = $v;
            }
    }

// loop thru files
foreach ($files as $file)
    {
        $status = 'Failure';
        // get extension
        $extension = pathinfo($file['name'], PATHINFO_EXTENSION);

        // make sure extension and type are not empty
        if ( ! (strlen($extension) && strlen($file['type']))) 
            {
                $msg = 'File extension or type not found';
            }
        else 
            {

                // make sure extension and type are allowed
                if ( ! (in_array($file['type'], $valid_types) && in_array($extension, $valid_exts))) 
                    {
                        $msg = "Extension '$extension' or file type '$file[type]' is not permitted";
                    }
                else 
                    {

                        // make sure file is not empty
                        if ( ! $file['size']) 
                            {
                                $msg = 'File seems to be empty (0 KB)';
                            }
                        else 
                            {

                                // make sure file is not too large
                                if ($file['size'] > $max_size) 
                                    {
                                        $msg = 'File is too large (' . ceil($file['size'] / 1024) . 'kB > ' . floor($max_size / 1024) . 'kB)';
                                    }
                                else 
                                    {

                                        // rename file here as you need
                                        $target = "$upload_dir/$_SESSION[myusername]Rejoin.$file[name]"; //rename file by placing rejoin before it
                                        // make sure files don't override
                                        if ( ! $allow_override && file_exists($target)) 
                                            {
                                                $msg = "File already exists";
                                            }
                                        else 
                                            {
                                                // no other errors
                                                if ($file['error'] > 0) 
                                                    {
                                                        $msg = "Unknown upload error (Code: $file[error])";
                                                    }
                                                else 
                                                    {
                                                        // attempt uploading
                                                        if ( ! move_uploaded_file($file['tmp_name'], $target)) 
                                                            {
                                                                $msg = 'Upload failed. Folder issues?';
                                                            }
                                                        else
                                                            {
                                                                // all good!
                                                                $msg = 'Upload successful!';
                                                                $status = 'Success';
                                                            }
                                                    }
                                            }
                                    }
                            }
                    }
            }       
        $out[] = "$file[name]: $status. $msg";
    }
echo implode("\n", $out);

/* End of file */
?>

如果有人可以指導我將不勝感激

Answer 1

在您的foreach中添加$ key => $ value會給您文件在上傳中的位置。 通過將$ key而不是$ file [name]連接在一起，您可以稍后使用它來更改$ target變量。

如果要重命名文件並覆蓋服務器上已經存在的文件，則跳過$ file [name]將是適當的，因為您確實不需要用戶稱為圖片的東西，而是支持數字重命名。

希望能有所幫助。