pdfs and duplicates

Hey Steve,

To answer your questions:

1. The plugin uses WordPress native upload functionality, so you should be able to import PDFs if your WordPress allows it. However, I will have to look more into this as well, as iIwas unable to import PDF files.

2. To keep the plugin fairly simple and basic, it is using the WP default media upload functionality, thus if you upload twice, WordPress media library is adding it.

There are no big plans to add any advanced feature to the plugin, but if you’re looking to prevent dupes, you would just need to add a ping code into the uploadbymediaurl.php file.

It would be something like this:

foreach($multiurl as $mu) {                    
              //download and insert as media attachment
            if(!ping(esc_url_raw($mu)) { umbu_download(esc_url_raw($mu)); } 
 }

Then you can just add a ping code.

/**
 * Check if an item exists out there in the "ether".
 *
 * @param string $url - preferably a fully qualified URL
 * @return boolean - true if it is out there somewhere
 */
function ping($url) {
    if (($url == '') || ($url == null)) { return false; }
    $response = wp_remote_head( $url, array( 'timeout' => 5 ) );
    $accepted_status_codes = array( 200, 301, 302 );
    if ( ! is_wp_error( $response ) && in_array( wp_remote_retrieve_response_code( $response ), $accepted_status_codes ) ) {
        return true;
    }
    return false;
}

Source: https://stackoverflow.com/questions/7952977/php-check-if-url-and-a-file-exists