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I need to rename images uploaded by the user when they post on my site.

I have a code that works perfectly to save the image and make it part of the post. But I want the images to be renamed to have the title of the post in their filename.

The code I have:

require_once( ABSPATH . 'wp-admin/includes/image.php' );
require_once( ABSPATH . 'wp-admin/includes/file.php' );
require_once( ABSPATH . 'wp-admin/includes/media.php' );
$img_id01 = media_handle_upload( 'img_main', $postID );
update_post_meta($postID, 'img_id01', $img_id01);
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  • 'update_post_meta' adds the image to the post 'img_id01' field. That post is being created by the user in the front-end. The images are inserted via upload field and I use the 'media_handle_upload' to handle the file upload POST request, and to create the attachment post in the database. But if I don't use the 'update_post_meta' the image don't get inserted in the post. Commented Sep 26, 2018 at 16:40
  • I want to rename the image before its saved on the server. Don't want to 'edit' it after the post is created and the images are attached. Commented Sep 26, 2018 at 16:42
  • Looking at the function that handles the upload, I can see a call to the function wp_unique_filename(), which in itself has a filter wp_unique_filename applied before returning the value.
    – Hans
    Commented Sep 26, 2018 at 16:55
  • Ok, I see it. But I have no idea how to use that with the code I have. Any hints? Commented Sep 26, 2018 at 17:01
  • You need to make sure that images only get renamed in that specific use case, and not while you upload stuff ie. in the Media Library. But I don't know your code, so it's hard for me to tell.
    – Hans
    Commented Sep 26, 2018 at 17:04

1 Answer 1

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I cannot test this because I don't have your code, but maybe you can get some ideas from it:

add_filter( 'wp_unique_filename', 'custom_image_name', 10, 2 );
$img_id01 = media_handle_upload( 'img_main', $postID );
remove_filter( 'wp_unique_filename', 'custom_image_name', 10, 2 );

function custom_image_name( $filename, $ext ) {

    global $postID;
    $post = get_post( $postID );
    return $filename . '-' . $post->post_name . $ext;
}

This is not very elegant because $postID needs to be in a global scope, but it might do the job.

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  • I'll give it a try tomorrow and see what I get. I'll let you know if it works. Thnx Commented Sep 26, 2018 at 17:20

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