[WP Media Categories] Wordpress plugin to add categories and tags to media items #Wordpress

media-categories.php

<?php
/**
 * Plugin Name: Media Categories and Tags
 * Plugin URI: https://gist.github.com/goodevilgenius/755bc2e7b78ee0b26890
 * Description: Adds categories to media
 * Version: 0.3.0
 * Author: Dan Jones
 * Author URI: http://danielrayjones.com/
 * License: MIT
 */

function drj_image_taxonomy_settings_init() {
    add_settings_section(
        'drj_image_tax_section'
        , ''
        , 'drj_image_tax_section_cb'
        , 'media'
    );

    add_settings_field(
        'drj_image_tax_separate'
        , 'Media Categories and Tags'
        , 'drj_image_tax_cb'
        , 'media'
        , 'drj_image_tax_section'
    );

    register_setting('media', 'drj_image_tax_separate');
}
add_action('admin_init','drj_image_taxonomy_settings_init');

function drj_image_tax_section_cb() { echo "<!-- Media Settings and Categories -->"; }
function drj_image_tax_cb() {
    echo '<input name="drj_image_tax_separate" id="drj_image_tax_separate" type="checkbox" value="1" '
        . ' class="code" ' . (get_option('drj_image_tax_separate') == 1 ? 'checked="checked"' : '') . ' />';
    echo '<label for="drj_image_tax_separate">Use separate tags and categories for media</label>';
}

/** Register taxonomy for images */
function drj_register_taxonomy_for_images() {
    
    if (get_option('drj_image_tax_separate') == 1) {

        $labels = array(
            'name'                       => 'Media Categories',
            'singular_name'              => 'Media Category',
            'menu_name'                  => 'Media Category',
            'all_items'                  => 'All Media Categories',
            'parent_item'                => 'Parent Category',
            'parent_item_colon'          => 'Parent Category:',
            'new_item_name'              => 'New Media Category',
            'add_new_item'               => 'Add New Media Category',
            'edit_item'                  => 'Edit Media Category',
            'update_item'                => 'Update Media Category',
            'separate_items_with_commas' => 'Separate categories with commas',
            'search_items'               => 'Search Media Categories',
            'add_or_remove_items'        => 'Add or remove categories',
            'choose_from_most_used'      => 'Choose from the most used category',
            'not_found'                  => 'Not Found',
        );
        $args = array(
            'labels'                     => $labels,
            'hierarchical'               => true,
            'public'                     => true,
            'show_ui'                    => true,
            'show_admin_column'          => true,
            'show_in_nav_menus'          => true,
            'show_tagcloud'              => true,
        );
        register_taxonomy( 'media_category', 'attachment', $args );

        $labels = array(
            'name'                       => 'Media Tags',
            'singular_name'              => 'Media Tag',
            'menu_name'                  => 'Media Tag',
            'all_items'                  => 'All Media Tags',
            'parent_item'                => 'Parent Tag',
            'parent_item_colon'          => 'Parent Tag:',
            'new_item_name'              => 'New Media Tag',
            'add_new_item'               => 'Add New Media Tag',
            'edit_item'                  => 'Edit Media Tag',
            'update_item'                => 'Update Media Tag',
            'separate_items_with_commas' => 'Separate tags with commas',
            'search_items'               => 'Search Media Tags',
            'add_or_remove_items'        => 'Add or remove tags',
            'choose_from_most_used'      => 'Choose from the most used tag',
            'not_found'                  => 'Not Found',
        );
        $args = array(
            'labels'                     => $labels,
            'hierarchical'               => false,
            'public'                     => true,
            'show_ui'                    => true,
            'show_admin_column'          => true,
            'show_in_nav_menus'          => true,
            'show_tagcloud'              => true,
        );
        register_taxonomy( 'media_tag', 'attachment', $args );
		register_taxonomy_for_object_type( 'media_category', 'attachment' );
		register_taxonomy_for_object_type( 'media_tag', 'attachment' );
    } else {
		register_taxonomy_for_object_type( 'category', 'attachment' );
		register_taxonomy_for_object_type( 'post_tag', 'attachment' );
    }
}
add_action( 'init', 'drj_register_taxonomy_for_images' );

/** Add a category and tag filter to images */
function drj_add_image_category_filter() {
		$screen = get_current_screen();
		if ('upload' == $screen->id) {
            if (get_option('drj_image_tax_separate') == 1) {
                function drj_print_media_category($cat, $level = 0) {
                    echo '<option class="level-'.$level.'" value="'.$cat->slug.'">'.str_repeat('&nbsp;',$level*3).$cat->name."</option>\n";
                    $sub_cats = get_terms('media_category','parent='.$cat->term_id);
                    foreach($sub_cats as $c) drj_print_media_category($c, $level+1);
                }
                echo '<input type="hidden" name="taxonomy" value="media_category" />';
                $cats = get_terms('media_category','parent=0');
                echo '<select name="term" id="media-category-term" class="postform">';
                echo '<option value="" selected="selected">View all categories</option>';
                foreach($cats as $cat) drj_print_media_category($cat);
                echo "</select>\n";
            } else {
            
                $dropdown_options = array( 'show_option_all' => __( 'View all categories', 'drj' )
                , 'hide_empty' => false
                , 'hierarchical' => true
                , 'orderby' => 'name'
                , 'hide_if_empty' => true
                );
                wp_dropdown_categories($dropdown_options);
            }
		}
}
add_action( 'restrict_manage_posts', 'drj_add_image_category_filter' );

Hi

I happen to come across your code. In the media library I am missing having the opportunity to select en existing media category or tag. Right now it shows a text field for both. It would be nice with checkboxes similar to selecting the regular post categories through a post page Categories sidebar widget. Have a great day!