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<?php

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/**

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* Plugin Name: Entry Views

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* Plugin URI: http://themehybrid.com/plugins/entry-views

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* Description: A WordPress plugin for tracking the number of post views.

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* Version: 1.0.0

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* Author: Justin Tadlock

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* Author URI: http://justintadlock.com

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* Text Domain: entry-views

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* Domain Path: /languages

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* Entry views is a script for calculating the number of views a post gets. It is meant to be basic and

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* not a full-featured solution. The idea is to allow theme/plugin authors to quickly load this file and

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* build functions on top of it to suit their project needs. This is an AJAX-based solution, so only visitors

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* to your site with JavaScript enabled in their browser will update the view count. It is possible to do this

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* without AJAX but not recommend (see notes below).

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* Not using AJAX: You can call up ev_set_post_view_count() at any time and pass it a post ID to update the

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* count, but this has problems. Any links with rel="next" or rel="prefetch" will cause some browsers to prefetch

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* the data for that particular page. This can cause the view count to be skewed. To try and avoid this

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* issue, you need to disable/remove adjacent_posts_rel_link_wp_head(). However, this is not bullet-proof

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* as it cannot control links it doesn't know about.

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* @link http://core.trac.wordpress.org/ticket/14568

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* This program is free software; you can redistribute it and/or modify it under the terms of the GNU

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* General Public License as published by the Free Software Foundation; either version 2 of the License,

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* or (at your option) any later version.

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* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without

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* even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

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* @package EntryViews

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* @version 1.0.0

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* @author Justin Tadlock <justin@justintadlock.com>

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* @link http://themehybrid.com/plugins/entry-views

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* @license http://www.gnu.org/licenses/old-licenses/gpl-2.0.html

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/**

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* Plugin loader class.

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* @since 1.0.0

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final class Entry_Views_Plugin {

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/**

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* Holds the instances of this class.

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* @since 1.0.0

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* @access private

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* @var object

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private static $instance;

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/**

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* The post ID to update the entry views for.

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* @since 1.0.0

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* @access public

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* @var int

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public $post_id = 0;

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/**

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* Sets up needed actions/filters for the plugin to initialize.

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* @since 1.0.0

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* @access public

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* @return void

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public function __construct() {

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add_action( 'plugins_loaded', array( $this, 'i18n' ), 2 );

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add_action( 'plugins_loaded', array( $this, 'includes' ), 3 );

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add_action( 'init', array( $this, 'post_type_support' ), 10 );

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add_action( 'widgets_init', array( $this, 'register_widgets' ), 10 );

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add_action( 'template_redirect', array( $this, 'load' ), 99 );

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add_action( 'wp_ajax_entry_views', array( $this, 'update_ajax' ), 10 );

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add_action( 'wp_ajax_nopriv_entry_views', array( $this, 'update_ajax' ), 10 );

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}

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/**

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* Loads the translation files.

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* @since 1.0.0

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* @access public

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* @return void

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function i18n() {

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load_plugin_textdomain( 'entry-views', false, 'entry-views/languages' );

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}

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/**

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* Loads the initial files needed by the plugin.

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* @since 1.0.0

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* @access public

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* @return void

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function includes() {

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$path = trailingslashit( plugin_dir_path( __FILE__ ) );

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require_once( "{$path}inc/functions.php" );

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require_once( "{$path}inc/template.php" );

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require_once( "{$path}inc/shortcodes.php" );

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require_once( "{$path}inc/widget-entry-views.php" );

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}

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/**

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* Adds support for 'entry-views' to the 'post', 'page', and 'attachment' post types (default WordPress

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* post types). For all other post types, the theme should explicitly register support for this feature.

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* @since 1.0.0

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* @access public

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* @return void

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function post_type_support() {

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/* Core post types. */

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add_post_type_support( 'post', array( 'entry-views' ) );

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add_post_type_support( 'page', array( 'entry-views' ) );

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add_post_type_support( 'attachment', array( 'entry-views' ) );

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/* Plugin post types. */

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add_post_type_support( 'literature', array( 'entry-views' ) );

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add_post_type_support( 'portfolio_item', array( 'entry-views' ) );

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add_post_type_support( 'recipe', array( 'entry-views' ) );

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add_post_type_support( 'restaurant_item', array( 'entry-views' ) );

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}

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/**

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* Registers the plugin's widgets.

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* @since 1.0.0

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* @access public

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* @return void

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public function register_widgets() {

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register_widget( 'EV_Widget_Entry_Views' );

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}

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/**

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* Checks if we're on a singular post view and if the current post type supports the 'entry-views'

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* extension. If so, set the $post_id variable and load the needed JavaScript.

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* @since 1.0.0

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* @access public

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* @return void

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function load() {

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/* Check if we're on a singular post view. */

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if ( is_singular() && !is_preview() ) {

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/* Get the post object. */

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$post = get_queried_object();

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/* Check if the post type supports the 'entry-views' feature. */

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if ( post_type_supports( $post->post_type, 'entry-views' ) ) {

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/* Set the post ID for later use because we wouldn't want a custom query to change this. */

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$this->post_id = get_queried_object_id();

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/* Enqueue the jQuery library. */

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wp_enqueue_script( 'jquery' );

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/* Load the entry views JavaScript in the footer. */

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add_action( 'wp_footer', array( $this, 'load_scripts' ) );

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}

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}

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}

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/**

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* Callback function hooked to 'wp_ajax_entry_views' and 'wp_ajax_nopriv_entry_views'. It checks the

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* AJAX nonce and passes the given $post_id to the entry views update function.

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* @since 1.0.0

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* @access public

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* @return void

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function update_ajax() {

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/* Check the AJAX nonce to make sure this is a valid request. */

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check_ajax_referer( 'entry_views_ajax' );

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/* If the post ID is set, set it to the $post_id variable and make sure it's an integer. */

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if ( isset( $_POST['post_id'] ) )

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$post_id = absint( $_POST['post_id'] );

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/* If $post_id isn't empty, pass it to the ev_set_post_view_count() function to update the view count. */

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if ( !empty( $post_id ) )

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ev_set_post_view_count( $post_id );

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}

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/**

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* Displays a small script that sends an AJAX request for the page. It passes the $post_id to the AJAX

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* callback function for updating the meta.

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* @since 1.0.0

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* @access public

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* @return void

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function load_scripts() {

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/* Create a nonce for the AJAX request. */

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$nonce = wp_create_nonce( 'entry_views_ajax' );

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/* Display the JavaScript needed. */

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echo '<script type="text/javascript">/* <![CDATA[ */ jQuery(document).ready( function() { jQuery.post( "' . admin_url( 'admin-ajax.php' ) . '", { action : "entry_views", _ajax_nonce : "' . $nonce . '", post_id : ' . absint( $this->post_id ) . ' } ); } ); /* ]]> */</script>' . "\n";

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}

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/**

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* Returns the instance.

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* @since 1.0.0

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* @access public

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* @return object

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public static function get_instance() {

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if ( !self::$instance )

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self::$instance = new self;

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return self::$instance;

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}

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}

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Entry_Views_Plugin::get_instance();

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