WordPress Post Views with post_meta

post-views.php

<?php

define('POST_VIEWS_KEY', 'post_views_count');

function addMetaPostViews( $_postID, $_count = 0 ) {
    delete_post_meta( $_postID, POST_VIEWS_KEY );
    add_post_meta( $_postID, POST_VIEWS_KEY, $_count );
}

function hasViews( $_postID ) {
    return !empty( get_post_meta( $_postID, POST_VIEWS_KEY, true ) ) ;
}

// function to display number of posts.
function getPostViews( $_postID ) {
    if ( is_object( $_postID ) )
        $_postID = $_postID['id'];

    if ( hasViews( $_postID ) ) {
        return  get_post_meta( $_postID, POST_VIEWS_KEY, true ) . ' visualizações';
    }

    addMetaPostViews( $_postID, 0 );
    return "Nenhuma visualização";
}

// function to count views.
function setPostViews( $_postID ) {
    if ( is_object( $_postID ) )
        $_postID = $_postID['id'];

    if ( hasViews( $_postID ) ) {
        $_totalViews = str_replace( ".", "", get_post_meta( $_postID, POST_VIEWS_KEY, true ));
        return update_post_meta( $_postID, POST_VIEWS_KEY, number_format( ((int)$_totalViews + 1), 0, ",", "." ) );
    }

    return addMetaPostViews( $_postID, 0 );
}

function formatViewsNumber( $_number ) {
    return number_format( str_replace( ".", "", $_number), 0, ",", "." );
}

function updatePostViews( $_postID, $_totalViews = 0 ) {
    if ( hasViews( $_postID ) ) {
        update_post_meta( $_postID, POST_VIEWS_KEY, formatViewsNumber( $_totalViews ) );
    } else {
        addMetaPostViews( $_postID, formatViewsNumber( $_totalViews ) );
    }
}

function updateAllPostsViews( $_postType = 'blog' ) {
    $wp_query = new WP_Query(
        array(
            'post_type' => $_postType,
            'posts_per_page' => -1
        )
    );

    if ($wp_query->have_posts()) {
        while($wp_query->have_posts()) {
            $wp_query->the_post();
            $_postID = get_the_ID();
            updatePostViews( $_postID, wpp_get_views( $_postID, false ) );
        }
    }
}

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'] = __('Visualizações');
    return $defaults;
}

function posts_custom_column_views( $column_name, $id ) {
    if ( $column_name === 'post_views' ) {
        // updateViews=1
        if ( isset($_GET['updateViews']) ) {
            updatePostViews( get_the_ID(), wpp_get_views( get_the_ID(), false) );
        }
        echo getPostViews( get_the_ID() );
    }
}