Resize beim Upload von Plugin bei Artikelbilder

<?php  
/*  
Plugin Name: Auto Save Remote Image 
Plugin URI: http://www.devsaab.com/wordpress/  
Description: This plugin automatically downloads the first remote image from a post and sets it as the featured image.
Version: 1.3
Author: Prebhdev Singh 
Disclaimer: No warranty or guarantee of any kind!  Use this in your own risk.  
*/
add_action('publish_post', 'fetch_images');


function fetch_images( $post_ID )  
{    
    //Check to make sure function is not executed more than once on save
    if ( defined('DOING_AUTOSAVE') && DOING_AUTOSAVE ) 
    return;


    if ( !current_user_can('edit_post', $post_ID) ) 
    return;


    remove_action('publish_post', 'fetch_images');    
        
    $post = get_post($post_ID);   


    $first_image = '';
    
    if(preg_match_all('/<img.+src=[\'"]([^\'"]+)[\'"].*>/i', $post->post_content, $matches)){
        $first_image = $matches [1] [0];
    }


    if (strpos($first_image,$_SERVER['HTTP_HOST'])===false)
    {
            
        //Fetch and Store the Image    
        $get = wp_remote_get( $first_image );
        $type = wp_remote_retrieve_header( $get, 'content-type' );
        $mirror = wp_upload_bits(rawurldecode(basename( $first_image )), '', wp_remote_retrieve_body( $get ) );
    
        //Attachment options
        $attachment = array(
        'post_title'=> basename( $first_image ),
        'post_mime_type' => $type
        );
        
        // Add the image to your media library and set as featured image
        $attach_id = wp_insert_attachment( $attachment, $mirror['file'], $post_ID );
        $attach_data = wp_generate_attachment_metadata( $attach_id, $first_image );
        wp_update_attachment_metadata( $attach_id, $attach_data );
        set_post_thumbnail( $post_ID, $attach_id );
    
        $updated = str_replace($first_image, $mirror['url'], $post->post_content);
        
        //Replace the image in the post
        wp_update_post(array('ID' => $post_ID, 'post_content' => $updated));
    
        // re-hook this function
        add_action('publish_post', 'fetch_images');        
    }
}
?>