how to show post views without plugins

add bellow code in function.php file
function getPostViews($postID){
$count_key = 'post_views_count';
$count = get_post_meta($postID, $count_key, true);
if($count==''){
delete_post_meta($postID, $count_key);
add_post_meta($postID, $count_key, '1');
return "1";
}
return $count.'';
}
function setPostViews($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');
}else{
$count++;
update_post_meta($postID, $count_key, $count);
}
}
add in theme where you want to disply
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