Post Views for WordPress

hi, i use this code for show my post view and my popular post. but this code show 0

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, ‘0’);
return “0”;
}
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, ‘0’);
}else{
$count++;
update_post_meta($postID, $count_key, $count);
}
}

add_filter(‘manage_posts_columns’, ‘posts_column_views’);
add_action(‘manage_posts_custom_column’, ‘posts_custom_column_views’,5,2);
function posts_column_views($defaults){
$defaults[‘post_views’] = __(‘View’);
return $defaults;
}
function posts_custom_column_views($column_name, $id){
if($column_name === ‘post_views’){
echo getPostViews(get_the_ID());
}
}