Rename files during upload within Wordpress backend

is there a way to rename files during the upload progre开发者_JAVA技巧ss within the Wordpress 3.0 backend? I would like to have a consistent naming of files, especially for images.

I think an 12 (+-) digit hash value of the original filename or something similar would be awesome. Any suggestions?

Regards

But it would really be easier to do that before uploading files.

Not quite sure about that - this seems fairly easy;

/**
 * @link http://stackoverflow.com/a/3261107/247223
 */
function so_3261107_hash_filename( $filename ) {
    $info = pathinfo( $filename );
    $ext  = empty( $info['extension'] ) ? '' : '.' . $info['extension'];
    $name = basename( $filename, $ext );

    return md5( $name ) . $ext;
}

add_filter( 'sanitize_file_name', 'so_3261107_hash_filename', 10 );

This filter creates a 32 character hash of the original filename, preserving the file extension. You could chop it down a little using substr() if you wanted to.

This filter runs once the file has been uploaded to a temporary directory on your server, but before it is resized (if applicable) and saved to your uploads folder.

Note that there is no risk of file overwrite - in the event that a newly hashed file is the same as one that already exists, WordPress will try appending an incrementing digit to the filename until there is no longer a collision.

WordPress Plugin

<?php

/**
 * Plugin Name: Hash Upload Filename
 * Plugin URI:  http://stackoverflow.com/questions/3259696
 * Description: Rename uploaded files as the hash of their original.
 * Version:     0.1
 */

/**
 * Filter {@see sanitize_file_name()} and return an MD5 hash.
 *
 * @param  string $filename
 * @return string
 */
function so_3261107_hash_filename( $filename ) {
    $info = pathinfo( $filename );
    $ext  = empty( $info['extension'] ) ? '' : '.' . $info['extension'];
    $name = basename( $filename, $ext );

    return md5( $name ) . $ext;
}

add_filter( 'sanitize_file_name', 'so_3261107_hash_filename', 10 );

http://wpapi.com/change-image-name-to-wordpress-post-slug-during-upload/

BTW:

Add filter to sanitize_file_name is totally wrong, as sanitize_file_name() function is a helper function to format string, it may be used elsewhere like plugins or themes.

function wp_modify_uploaded_file_names($file) {
    $info = pathinfo($file['name']);
    $ext  = empty($info['extension']) ? '' : '.' . $info['extension'];
    $name = basename($file['name'], $ext);

    $file['name'] = uniqid() . $ext; // uniqid method
    // $file['name'] = md5($name) . $ext; // md5 method
    // $file['name'] = base64_encode($name) . $ext; // base64 method

    return $file;
}

add_filter('wp_handle_upload_prefilter', 'wp_modify_uploaded_file_names', 1, 1);

I've made a plugin for it. I did it because i was having too much trouble with my clients trying to upload images with special characters

http://wordpress.org/plugins/file-renaming-on-upload

I implemented the same thing, I wanted a more random filename, than the original, as the site I am using this for is for pics only and all files are in one directory.

i did the following

return md5($ip . uniqid(mt_rand(), true)) . $ext;

I was really looking for a plugin that could do it properly, and finally I ended up making this one myself. It's available on my blog: http://www.meow.fr/media-file-renamer ! If you use it, please give me a feedback :) I sincerely hope it helps!

You can't autorename file with the media library function. I would recommend to rename files before you upload them. Even after uploading a file you can't rename it throug WordPress but only through FTP.

The only way to do that would be a plugin that hooks itself into the media library upload process. But it would really be easier to do that before uploading files.