Качване на файлове в WordPress Media Library използвайки PHP

<form method="post" action="" enctype="multipart/form-data">
 
    <p>
        <input type="file" name="myfile" id="myfile" />
    </p>
 
    <p><input type="submit" value="Uploaden" id="submit" name="submit" class="submit" /></p>
 
</form>

// https://cube3x.com/upload-files-to-wordpress-media-library-using-php/
if(@$_FILES['myfile']['size']){
    if ( ! function_exists( 'wp_handle_upload' ) ) require_once( ABSPATH . 'wp-admin/includes/file.php' );
    if ( ! function_exists( 'wp_generate_attachment_metadata' ) ) require_once( ABSPATH . 'wp-admin/includes/image.php' );
    $uploadedfile = $_FILES['myfile'];
    if($uploadedfile){
        $upload_overrides = array( 'test_form' => false );
        $movefile = wp_handle_upload( $uploadedfile, $upload_overrides );
        if ( $movefile ) {
            $post = array(
                'post_title' => time(),
                'post_content' => '',
                'post_status' => 'publish',
                'post_type' => 'card'
            );
            $upload_post_id = wp_insert_post($post);
            do_action('wp_insert_post', 'wp_insert_post'); 
 
            $wp_filetype = $movefile['type'];
            $filename = $movefile['file'];
            $wp_upload_dir = wp_upload_dir();
            $attachment = array(
                'guid' => $wp_upload_dir['url'] . '/' . basename( $filename ),
                'post_mime_type' => $wp_filetype,
                'post_title' => preg_replace('/\.[^.]+$/', '', basename($filename)),
                'post_content' => '',
                'post_status' => 'inherit'
            );
            $attach_id = wp_insert_attachment( $attachment, $filename, $upload_post_id);
            $attach_data = wp_generate_attachment_metadata($attach_id, $filename);
            //dump($attach_data); die;
            wp_update_attachment_metadata($attach_id, $attach_data);
            set_post_thumbnail( $upload_post_id, $attach_id);
            if($attach_id) header("Location: ".get_permalink(PAGE_ID_EXAMPLE));
        }
    }
}