Wordpress function repos

/* get featured img url */

function featured_img_url() {
	$thumb_id = get_post_thumbnail_id();
	$thumb_url_array = wp_get_attachment_image_src($thumb_id, 'thumbnail-size', true);
	$thumb_url = $thumb_url_array[0];
	
	return $thumb_url;
}

/* get post slug (machine name) */

function get_post_slug() {
	global $post;
	$slug = $post->post_name;
	
	return $slug;
}

/* get menu items based on menu's machine name */

function mobile_menu_items($menu_machine_name){
	$menu_name = $menu_machine_name;
	$locations = get_nav_menu_locations();
	$menu = wp_get_nav_menu_object( $locations[ $menu_name ] );
	$menuitems = wp_get_nav_menu_items( $menu->term_id, array( 'order' => 'DESC' ) );
	
	$menu_group = '
';
	$count = 0;
    $submenu = false;
    foreach( $menuitems as $item ){
			$link = $item->url;
			$title = $item->title;
			// item does not have a parent so menu_item_parent equals 0 (false)
			if ( !$item->menu_item_parent ){
				// save this id for later comparison with sub-menu items
				$parent_id = $item->ID;
				$menu_group .= '
'.$title.'';
			}
			if ( $parent_id == $item->menu_item_parent ){
				if ( !$submenu ){
					$submenu = true;
					$menu_group .= '
';
				}
				$menu_group .= '
'.$title.'
';
				if ( $menuitems[ $count + 1 ]->menu_item_parent != $parent_id && $submenu ){
					$menu_group .= '
';
					$submenu = false;
				};
			};
			if ( $menuitems[ $count + 1 ]->menu_item_parent != $parent_id ){
				$menu_group .= '
';
				$submenu = false; 
			};
			$count++;
		};
		return $menu_group;
}

// Get the name of the custom category slug
function singular_get_slug(){
    global $post;
   $primary_term = new WPSEO_Primary_Term( 'blog', $post->ID );
   $pt = $primary_term->get_primary_term();
   $bterm = get_term_by( "id", $pt, 'blog', ARRAY_A, 'raw' );
   $HTML  = $bterm["slug"];
   return $HTML;
}
add_shortcode('singular_get_slug', 'singular_get_slug');

//get all posts that belong to the same taxonomy term
function show_taxonomy_posts() {
	$current_slug = singular_get_slug();
		$args = array(
                    'post_type' => 'post',
                    'tax_query' => array(
						array(
							'taxonomy' => 'blog',
							'field' => 'slug',
							'terms' => $current_slug
						)
					)
        );
		$query = new WP_Query( $args );
		
		$curr_title = get_the_title(); //get current post title
		
		echo '
';
		while ( $query->have_posts() ) : $query->the_post();
			$query_title = get_the_title();
			if ($query_title == $curr_title) { //check if queried post is the same as current post
			} else {
			echo '
'.get_the_title().'
';
			}
		endwhile;
		wp_reset_postdata();
		
		echo '
';
}
add_shortcode('show_taxonomy_posts', 'show_taxonomy_posts');