title: How to set first <li> link as active in a php menu
body: <p>Hi I am working with a Wordpress gallery plugin. </p>
  
  <p>I would like the first link in the filter menu to automatically be active when the page loads. This is as by default it loads ALL the images from all the categories and it's too many! Thanks.</p>
  
  <pre><code> &lt;?php
  
  
  wp_enqueue_script('imagesloaded', plugins_url('/assets/plugins/imagesloaded/imagesloaded.pkgd.min.js', __FILE__), array('jquery'), GO_GALLERY_VERSION, true);
  wp_enqueue_script('isotope', plugins_url('/assets/plugins/isotope/isotope.pkgd.min.js', __FILE__), array('jquery'), GO_GALLERY_VERSION, true);
  
  wp_enqueue_script('go-gallery', plugins_url('/assets/js/gallery.js', __FILE__), array('jquery', 'isotope', 'imagesloaded'), GO_GALLERY_VERSION, true);
  wp_enqueue_style('go-gallery', plugins_url('/assets/css/gallery.css', __FILE__), null, GO_GALLERY_VERSION);
  
  wp_enqueue_script('tos', plugins_url('/assets/plugins/tos/js/jquery.tosrus.min.custom.js', __FILE__), array('jquery'), GO_GALLERY_VERSION, true);
  wp_enqueue_style('tos', plugins_url('/assets/plugins/tos/css/jquery.tosrus.custom.css', __FILE__), null, GO_GALLERY_VERSION);
  
  
  
  $labels = array(
      'name'              =&gt; _x('Media Categories', 'taxonomy general name', 'go_gallery'),
      'singular_name'     =&gt; _x('Media Category', 'taxonomy singular name', 'go_gallery'),
      'search_items'      =&gt; __('Search Media Categories', 'go_gallery'),
      'all_items'         =&gt; __('All Media Categories', 'go_gallery'),
      'parent_item'       =&gt; __('Parent Media Category', 'go_gallery'),
      'parent_item_colon' =&gt; __('Parent Media Category:', 'go_gallery'),
      'edit_item'         =&gt; __('Edit Media Category', 'go_gallery'),
      'update_item'       =&gt; __('Update Media Category', 'go_gallery'),
      'add_new_item'      =&gt; __('Add New Media Category', 'go_gallery'),
      'new_item_name'     =&gt; __('New Media Category Name', 'go_gallery'),
      'menu_name'         =&gt; __('Media Categories', 'go_gallery'),
  );
  
  $args = array(
      'hierarchical'      =&gt; TRUE,
      'labels'            =&gt; $labels,
      'show_ui'           =&gt; TRUE,
      'show_admin_column' =&gt; TRUE,
      'query_var'         =&gt; TRUE,
      'rewrite'           =&gt; TRUE,
  );
  
  register_taxonomy('attachment_category', 'attachment',  $args );
  
  
  
  $output = '';
  
  $args = array(
      'post_type'         =&gt; 'attachment',
      'post_status'       =&gt; 'inherit',
      'posts_per_page'    =&gt; $atts['limit'],
      'order'             =&gt; 'DESC',
      'orderby'           =&gt; $atts['sort'],
      'post_mime_type'    =&gt; 'image/jpeg,image/gif,image/jpg,image/png'
  );
  
  
  $categories = array();
  
  $atts['icat'] = array_map('sanitize_title', explode(',', $atts['icat']));
  
  foreach ( $atts['icat'] as $category ) {
  
      if ( $term = get_term_by('slug', $category, 'attachment_category') ) {
          $categories[$term-&gt;term_id] = $term;
      }
  
  }
  
  if ( !empty($categories) ) {
      $args['tax_query'] = array(
          array(
              'taxonomy'  =&gt; 'attachment_category',
              'field'     =&gt; 'term_id',
              'terms'     =&gt; array_keys($categories)
          )
      );
  }
  
  $atts['menu_gap'] = min($atts['menu_gap'], 100);
  
  $classes[] = 'go-gallery';
  $classes[] = 'menu-' . $atts['menu_pos'];
  $classes[] = go_gallery_bool($atts['menu_show']) ? 'menu-show' : '';
  $classes[] = 'size-' . $atts['size'];
  $classes[] = 'style-' . $atts['style'];
  
  $attributes = array();
  $attributes['class'] = join(' ', $classes);
  $attributes['id'] = 'go-' . substr(md5(mt_rand(0, PHP_INT_MAX)), 0, 6);
  $attributes['data-gap'] = intval($atts['gap']);
  $attributes['data-border-color'] = $atts['border_color'];
  $attributes['data-lightbox'] = go_gallery_bool($atts['lightbox']) ? 'yes' : 'no';
  $attributes['data-desc-color'] = $atts['desc_color'];
  $attributes['data-menu-color'] = $atts['menu_color'];
  $attributes['data-menu-bg'] = $atts['menu_bg'];
  $attributes['data-menu-bg-hover'] = $atts['menu_bg_hover'];
  $attributes['data-menu-gap'] = $atts['menu_gap'];
  $attributes['data-bg'] = $atts['bg'];
  $attributes['data-border-size'] = $atts['border_size'];
  $attributes['data-overlay-color'] = go_gallery_hex2rgb($atts['overlay_color']);
  
  $thumb_size = 'medium';
  
  if ( $atts['size'] == 'large' || ($atts['style'] == 'squared' &amp;&amp; in_array($atts['size'], array('medium', 'large'))) ) {
      $thumb_size = 'large';
  }
  
  foreach ( $attributes as $attribute =&gt; $value ) {
      $attributes[$attribute] = $attribute . '="' . $value . '"';
  }
  
  $query = new WP_Query($args);
  
  $output .= '&lt;div ' . join(' ', $attributes) . '&gt;';
  $output .= '&lt;ul class="go-gallery-filters"&gt;';
  $output .= '&lt;li&gt;';
  $output .= '&lt;a data-filter="" href="#"&gt;' . __($atts['menu_button'], 'go_gallery') . '&lt;/a&gt;';
  $output .= '&lt;/li&gt;';
  
  foreach ( $categories as $category ) {
  
      if ( !empty($category) ) {
  
          $output .= '&lt;li class="active"&gt;';
          $output .= '&lt;a data-filter="' . $category-&gt;slug . '" href="#"&gt;' . $category-&gt;name . '&lt;/a&gt;';
          $output .= '&lt;/li&gt;';
      }
  
  }
  
  $output .= '&lt;/ul&gt;';
  
  $output .= '&lt;div class="go-gallery-list-wrapper"&gt;';
  $output .= '&lt;ul class="go-gallery-list"&gt;';
  
  foreach ( $query-&gt;posts as $post ) {
  
      $category_terms = wp_get_post_terms($post-&gt;ID, 'attachment_category');
  
      $classes = array();
      $classes[] = 'go-gallery-item';
  
      foreach ( $category_terms as $category_term ) {
          $classes[] = 'category-' . $category_term-&gt;slug;
      }
  
      $image_source = wp_get_attachment_image_src($post-&gt;ID, 'full');
  
      $output .= '&lt;li data-source="' . $image_source[0] . '" class="' . join(' ', $classes) . '"&gt;';
  
      $output .= '&lt;a class="image-wrap" href="' . $image_source[0] . '"&gt;';
      $output .= '&lt;figure&gt;';
  
      $output .= wp_get_attachment_image($post-&gt;ID, $thumb_size);
  
      $output .= '&lt;div class="image-overlay"&gt;';
  
      if ( go_gallery_bool( $atts['hover_data'] ) ){
          $output .= '&lt;h3&gt;' . $post-&gt;post_title . '&lt;/h3&gt;';
          $output .= '&lt;h4&gt;' . $post-&gt;post_content . '&lt;/h4&gt;';
      }
  
      $output .= '&lt;/div&gt;';
  
      $output .= '&lt;/figure&gt;';
      $output .= '&lt;/a&gt;';
      $output .= '&lt;/li&gt;';
  }
  
  $output .= '&lt;/ul&gt;';
  $output .= '&lt;/div&gt;';
  $output .= '&lt;/div&gt;';
  
  return $output;
  
  
  if(strlen($hex) == 3) {
      $r = hexdec(substr($hex,0,1).substr($hex,0,1));
      $g = hexdec(substr($hex,1,1).substr($hex,1,1));
      $b = hexdec(substr($hex,2,1).substr($hex,2,1));
  } else {
      $r = hexdec(substr($hex,0,2));
      $g = hexdec(substr($hex,2,2));
      $b = hexdec(substr($hex,4,2));
  }
  $rgb = array($r, $g, $b);
  return 'rgba(' . join(', ', $rgb) . ', ' . $alpha .')';
  </code></pre>