上传前重命名并替换多个图像文件

Question

i have an upload script through which user can upload and rename multiple images to the server. it works perfectly but what i want is that while renaming each image should be named as 1,2,3,4.. and so on depending on the number of uploaded image and it should also replace the previous image having the same name. Here is my code:

HTML part:

<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 */
?>

Would appreciate if someone could guide me

Answer 1

Adding the $key => $value into your foreach would give you the position of the file in the upload. You could use this late to change the $target variable, by concatenating together the $key instead of the $file[name].

If you are going to rename the files and overwrite the ones already on the server, skipping the $file[name] would be appropriate, since you dont really need what the user called the picture, in favor of your numerical renaming.

Hope this help.