Function to set post views and set cache.

post-views

<?php
function setPostViews($postID) {
  $count_key = 'post_views_count';
  $count = get_post_meta($postID, $count_key, true);
  if($count == ""){
    $count = 0;
    delete_post_meta($postID, $count_key);
    add_post_meta($postID, $count_key, '1');
    wp_cache_set( "view_" . $postID, TRUE, "", 0 );
  }else{
    if( !empty( wp_cache_get( "view_" . $postID ) ) ){
      $count++;  
      update_post_meta($postID, $count_key, $count);
      wp_cache_set( "view_" . $postID, TRUE, "", 0 );
    }