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I need to filter uploads to a specific folder for a custom-post type called "document" only for PDFs.

So far, I have:

function custom_upload_directory( $args ) {
$base_directory = '/home/xxx/my_uploadfolder';
$base_url = 'http://xxxx/wp-content/uploads/my_uploadfolder';

$id = $_REQUEST['post_id'];
$parent = get_post( $id )->post_parent;
// Check the post-type of the current post

if( "document" == get_post_type( $id ) || "document" == get_post_type( $parent ) ) {
    $args['path'] = $base_directory;
    $args['url']  = $base_url;
    $args['basedir'] = $base_directory;
    $args['baseurl'] = $base_url;

}

return $args;
}
add_filter( 'upload_dir', 'custom_upload_directory' );

It works, but with some problems: : any kind of file is redirected in my_uploadfolder. Also, I can't delete these files from WP admin once there. Can somebody help?

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2 Answers 2

The reason you're having trouble here is that you're applying a universal filter to upload_dir. Rather than doing this, use a conditional filter for upload_dir after first checking ['mime-type'] for application/pdf. You need to intercept the upload process at the wp_handle_upload action hook and alter the upload folder there. What you have posted is heading in the right direction, but you need to be working with the incoming $_POST data and applying the filter there by searching for uploading files ['mime-type'] which WordPress stores during the upload process.

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you might consider using

if(get_post_mime_type($id) == 'application/pdf'){
   ...
}

to check for pdf files.

http://codex.wordpress.org/Function_Reference/get_post_mime_type

You might also take a look at the code behind the wp_delete_attachment() function and you can hook into it with the delete attachment action. To remove the files you can use unlink()

http://php.net/manual/en/function.unlink.php

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