用例

添加文件更新文件（是的，也适用于已经存在的文件）多个文件无使用情形wordpress自动执行的自动保存作业，或者如果未满足目标文件类型或mime类型，则会中止。

Goodies

function wpse30313_update_attachment_names($post_ID)
{
    // Abort if WP does an autosave 
    if ( defined(\'DOING_AUTOSAVE\') && DOING_AUTOSAVE ) 
        return;

    # >>>> SET
        // New file name:
        $new_file_name = "___";

        // Best would be to take the post name as file name instead of a custom title:
        # $post_data = get_post( $post_ID );
        # $new_file_name = $post_data->post_name;

        // The file types we want be changed:
        $allowed_types = array(
            \'image\'
        );

        // The mime types we want to be changed:
        $allowed_ext = array(
             \'jpg\'
            ,\'jpeg\'
            ,\'gif\'
            ,\'png\'
        );
    # <<<< SET

    // Appended by post ID for collision safety
    $new_file_name = "{$new_file_name}-{$post_ID}";

    // get all attached files
    $attachments = get_children( array( 
         \'post_type\'    => \'attachment\'
        ,\'post_parent\'  => $post_ID
    ) );

    // Bulk updating attached file names
    foreach ( $attachments as $att )
    {
        $att_ID     = $att->ID;
        // Append attachment ID (collision safety)
        // Also allows sorting files by post & then attchment ID
        $new_name   = "{$new_file_name}-{$att_ID}";

        $mime_type  = explode( "/", get_post_mime_type( $att->ID ) );
        $file_type  = $mime_type[0];
        $mime_type  = $mime_type[1];

        // Skip file types we don\'t want to change
        if ( ! in_array( $file_type, $allowed_types ) )
            continue;
        // Skip mime types we don\'t want to change
        if ( ! in_array( $mime_type, $allowed_ext ) )
            continue;

        // Get current file info
        $file_path = get_attached_file( $att->ID );
        $path   = pathinfo( $file_path );
        $dir    = trailingslashit( $path[\'dirname\'] );
        $ext    = $path[\'extension\'];

        // Build final name
        $final  = "{$dir}{$new_name}.{$ext}";

        // Skip if the path was already changed on upload
        // If we don\'t set this, the function wouldn\'t work for older files
        if ( $file_path == $final )
            continue;

        // Update attachment-post meta info for file
        rename( $file_path, $final );
        update_attached_file( $att_ID, $final );
    }

    return;
}
add_action( \'add_attachment\', \'wpse30313_update_attachment_names\' );
add_action( \'edit_attachment\', \'wpse30313_update_attachment_names\' );

我会使用PHP的rename 和给定的文件路径get_attached_file.

function rename_file( $post_id, $newname ) {
    $file = get_attached_file( $post_id );
    rename($file,dirname($file).$newname)
}

如果有帮助，请告诉我，我会将代码更改为实际工作代码。

add_action(\'add_attachment\', \'rename\');
function rename($post_ID){

    $post = get_post($post_ID);
    $file = get_attached_file($post_ID);
    $path = pathinfo($file);
    $newfilename = "mynewfilename";
    $newfile = $path[\'dirname\']."/".$newfilename.".".$path[\'extension\'];

    rename($file, $newfile);    
    update_attached_file( $post_ID, $newfile );

}

Reference http://codex.wordpress.org/Function_Reference/update_attached_filehttp://wordpress.org/tags/add_attachment