Most used wordpress custom codes

WordPress-Utility.php

<?php

//////////////////////
// Custom Post Type //
//////////////////////

/*
* Creating a function to create our CPT tours
*/
 
function custom_post_type_tours() {
 
    // Set UI labels for Custom Post Type
    $labels = array(
        'name'                => _x( 'Tours', 'Post Type General Name', 'twentythirteen' ),
        'singular_name'       => _x( 'Tour', 'Post Type Singular Name', 'twentythirteen' ),
        'menu_name'           => __( 'Tours', 'twentythirteen' ),
        'parent_item_colon'   => __( 'Parent Tour', 'twentythirteen' ),
        'all_items'           => __( 'All Tours', 'twentythirteen' ),
        'view_item'           => __( 'View Tour', 'twentythirteen' ),
        'add_new_item'        => __( 'Add New Tour', 'twentythirteen' ),
        'add_new'             => __( 'Add New', 'twentythirteen' ),
        'edit_item'           => __( 'Edit Tour', 'twentythirteen' ),
        'update_item'         => __( 'Update Tour', 'twentythirteen' ),
        'search_items'        => __( 'Search Tour', 'twentythirteen' ),
        'not_found'           => __( 'Not Found', 'twentythirteen' ),
        'not_found_in_trash'  => __( 'Not found in Trash', 'twentythirteen' ),
    );
     
    // Set other options for Custom Post Type
     
    $args = array(
        'label'               => __( 'tours', 'twentythirteen' ),
        'description'         => __( 'Tours information', 'twentythirteen' ),
        'menu_icon'   => 'dashicons-location',
        'labels'              => $labels,
        // Features this CPT supports in Post Editor
        'supports'            => array( 'title', 'editor', 'excerpt', 'author', 'thumbnail', 'custom-fields', 'revisions', 'page-attributes', ),
        // You can associate this CPT with a taxonomy or custom taxonomy. 
        'taxonomies'          => array( 'genres' ),
        /* A hierarchical CPT is like Pages and can have
        * Parent and child items. A non-hierarchical CPT
        * is like Posts.
        */ 
        'hierarchical'        => false,
        'public'              => true,
        'show_ui'             => true,
        'show_in_menu'        => true,
        'show_in_nav_menus'   => true,
        'show_in_admin_bar'   => true,
        'menu_position'       => 5,
        'can_export'          => true,
        'has_archive'         => true,
        'exclude_from_search' => false,
        'publicly_queryable'  => true,
        'capability_type'     => 'page',
    );
     
    // Registering your Custom Post Type
    register_post_type( 'tours', $args );
 
}
 
/* Hook into the 'init' action so that the function
* Containing our post type registration is not 
* unnecessarily executed. 
*/
 
add_action( 'init', 'custom_post_type_tours', 0 );

/**
* add a new column called order to admin tour listing screen
*/
function add_new_tour_column($post_columns) {
  $post_columns['menu_order'] = "Order";
  return $post_columns;
}
add_action('manage_edit-tours_columns', 'add_new_tour_column');

// re-order the custom column in listing page
function your_columns_head($defaults) {  

    $new = array();
    $menu_order = $defaults['menu_order'];  // save the menu_order column
    unset($defaults['menu_order']);   // remove it from the columns list

    foreach($defaults as $key=>$value) {
        if($key=='author') {  // when we find the author
           $new['menu_order'] = $menu_order;  // put the menu_order column before it
        }    
        $new[$key]=$value;
    }  

    return $new;  
} 
add_filter('manage_tours_posts_columns', 'your_columns_head');  

/**
* show values of tours order column
*/
function show_order_column($name){
  global $post;

  switch ($name) {
    case 'menu_order':
      $order = $post->menu_order;
      echo $order;
      break;
   default:
      break;
   }
}
add_action('manage_tours_posts_custom_column','show_order_column');

/**
* make column sortable
*/
function order_column_register_sortable($columns){
  $columns['menu_order'] = 'menu_order';
  return $columns;
}
add_filter('manage_edit-tours_sortable_columns','order_column_register_sortable');