post-like.php
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| <?php | |
| /* | |
| Name: WordPress Post Like System | |
| Description: A simple and efficient post like system for WordPress. | |
| Version: 0.5.2 | |
| Author: Jon Masterson | |
| Author URI: http://jonmasterson.com/ | |
| License: | |
| Copyright (C) 2015 Jon Masterson | |
| This program is free software: you can redistribute it and/or modify | |
| it under the terms of the GNU General Public License as published by | |
| the Free Software Foundation, either version 3 of the License, or | |
| (at your option) any later version. | |
| This program is distributed in the hope that it will be useful, | |
| but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| GNU General Public License for more details. | |
| You should have received a copy of the GNU General Public License | |
| along with this program. If not, see <http://www.gnu.org/licenses/>. | |
| */ | |
| /** | |
| * Register the stylesheets for the public-facing side of the site. | |
| * @since 0.5 | |
| */ | |
| add_action( 'wp_enqueue_scripts', 'sl_enqueue_scripts' ); | |
| function sl_enqueue_scripts() { | |
| wp_enqueue_script( 'simple-likes-public-js', get_template_directory_uri() . '/js/simple-likes-public.js', array( 'jquery' ), '0.5', false ); | |
| wp_localize_script( 'simple-likes-public-js', 'simpleLikes', array( | |
| 'ajaxurl' => admin_url( 'admin-ajax.php' ), | |
| 'like' => __( 'Like', 'YourThemeTextDomain' ), | |
| 'unlike' => __( 'Unlike', 'YourThemeTextDomain' ) | |
| ) ); | |
| } | |
| /** | |
| * Processes like/unlike | |
| * @since 0.5 | |
| */ | |
| add_action( 'wp_ajax_nopriv_process_simple_like', 'process_simple_like' ); | |
| add_action( 'wp_ajax_process_simple_like', 'process_simple_like' ); | |
| function process_simple_like() { | |
| // Security | |
| $nonce = isset( $_REQUEST['nonce'] ) ? sanitize_text_field( $_REQUEST['nonce'] ) : 0; | |
| if ( !wp_verify_nonce( $nonce, 'simple-likes-nonce' ) ) { | |
| exit( __( 'Not permitted', 'YourThemeTextDomain' ) ); | |
| } | |
| // Test if javascript is disabled | |
| $disabled = ( isset( $_REQUEST['disabled'] ) && $_REQUEST['disabled'] == true ) ? true : false; | |
| // Test if this is a comment | |
| $is_comment = ( isset( $_REQUEST['is_comment'] ) && $_REQUEST['is_comment'] == 1 ) ? 1 : 0; | |
| // Base variables | |
| $post_id = ( isset( $_REQUEST['post_id'] ) && is_numeric( $_REQUEST['post_id'] ) ) ? $_REQUEST['post_id'] : ''; | |
| $result = array(); | |
| $post_users = NULL; | |
| $like_count = 0; | |
| // Get plugin options | |
| if ( $post_id != '' ) { | |
| $count = ( $is_comment == 1 ) ? get_comment_meta( $post_id, "_comment_like_count", true ) : get_post_meta( $post_id, "_post_like_count", true ); // like count | |
| $count = ( isset( $count ) && is_numeric( $count ) ) ? $count : 0; | |
| if ( !already_liked( $post_id, $is_comment ) ) { // Like the post | |
| if ( is_user_logged_in() ) { // user is logged in | |
| $user_id = get_current_user_id(); | |
| $post_users = post_user_likes( $user_id, $post_id, $is_comment ); | |
| if ( $is_comment == 1 ) { | |
| // Update User & Comment | |
| $user_like_count = get_user_option( "_comment_like_count", $user_id ); | |
| $user_like_count = ( isset( $user_like_count ) && is_numeric( $user_like_count ) ) ? $user_like_count : 0; | |
| update_user_option( $user_id, "_comment_like_count", ++$user_like_count ); | |
| if ( $post_users ) { | |
| update_comment_meta( $post_id, "_user_comment_liked", $post_users ); | |
| } | |
| } else { | |
| // Update User & Post | |
| $user_like_count = get_user_option( "_user_like_count", $user_id ); | |
| $user_like_count = ( isset( $user_like_count ) && is_numeric( $user_like_count ) ) ? $user_like_count : 0; | |
| update_user_option( $user_id, "_user_like_count", ++$user_like_count ); | |
| if ( $post_users ) { | |
| update_post_meta( $post_id, "_user_liked", $post_users ); | |
| } | |
| } | |
| } else { // user is anonymous | |
| $user_ip = sl_get_ip(); | |
| $post_users = post_ip_likes( $user_ip, $post_id, $is_comment ); | |
| // Update Post | |
| if ( $post_users ) { | |
| if ( $is_comment == 1 ) { | |
| update_comment_meta( $post_id, "_user_comment_IP", $post_users ); | |
| } else { | |
| update_post_meta( $post_id, "_user_IP", $post_users ); | |
| } | |
| } | |
| } | |
| $like_count = ++$count; | |
| $response['status'] = "liked"; | |
| $response['icon'] = get_liked_icon(); | |
| } else { // Unlike the post | |
| if ( is_user_logged_in() ) { // user is logged in | |
| $user_id = get_current_user_id(); | |
| $post_users = post_user_likes( $user_id, $post_id, $is_comment ); | |
| // Update User | |
| if ( $is_comment == 1 ) { | |
| $user_like_count = get_user_option( "_comment_like_count", $user_id ); | |
| $user_like_count = ( isset( $user_like_count ) && is_numeric( $user_like_count ) ) ? $user_like_count : 0; | |
| if ( $user_like_count > 0 ) { | |
| update_user_option( $user_id, "_comment_like_count", --$user_like_count ); | |
| } | |
| } else { | |
| $user_like_count = get_user_option( "_user_like_count", $user_id ); | |
| $user_like_count = ( isset( $user_like_count ) && is_numeric( $user_like_count ) ) ? $user_like_count : 0; | |
| if ( $user_like_count > 0 ) { | |
| update_user_option( $user_id, '_user_like_count', --$user_like_count ); | |
| } | |
| } | |
| // Update Post | |
| if ( $post_users ) { | |
| $uid_key = array_search( $user_id, $post_users ); | |
| unset( $post_users[$uid_key] ); | |
| if ( $is_comment == 1 ) { | |
| update_comment_meta( $post_id, "_user_comment_liked", $post_users ); | |
| } else { | |
| update_post_meta( $post_id, "_user_liked", $post_users ); | |
| } | |
| } | |
| } else { // user is anonymous | |
| $user_ip = sl_get_ip(); | |
| $post_users = post_ip_likes( $user_ip, $post_id, $is_comment ); | |
| // Update Post | |
| if ( $post_users ) { | |
| $uip_key = array_search( $user_ip, $post_users ); | |
| unset( $post_users[$uip_key] ); | |
| if ( $is_comment == 1 ) { | |
| update_comment_meta( $post_id, "_user_comment_IP", $post_users ); | |
| } else { | |
| update_post_meta( $post_id, "_user_IP", $post_users ); | |
| } | |
| } | |
| } | |
| $like_count = ( $count > 0 ) ? --$count : 0; // Prevent negative number | |
| $response['status'] = "unliked"; | |
| $response['icon'] = get_unliked_icon(); | |
| } | |
| if ( $is_comment == 1 ) { | |
| update_comment_meta( $post_id, "_comment_like_count", $like_count ); | |
| update_comment_meta( $post_id, "_comment_like_modified", date( 'Y-m-d H:i:s' ) ); | |
| } else { | |
| update_post_meta( $post_id, "_post_like_count", $like_count ); | |
| update_post_meta( $post_id, "_post_like_modified", date( 'Y-m-d H:i:s' ) ); | |
| } | |
| $response['count'] = get_like_count( $like_count ); | |
| $response['testing'] = $is_comment; | |
| if ( $disabled == true ) { | |
| if ( $is_comment == 1 ) { | |
| wp_redirect( get_permalink( get_the_ID() ) ); | |
| exit(); | |
| } else { | |
| wp_redirect( get_permalink( $post_id ) ); | |
| exit(); | |
| } | |
| } else { | |
| wp_send_json( $response ); | |
| } | |
| } | |
| } | |
| /** | |
| * Utility to test if the post is already liked | |
| * @since 0.5 | |
| */ | |
| function already_liked( $post_id, $is_comment ) { | |
| $post_users = NULL; | |
| $user_id = NULL; | |
| if ( is_user_logged_in() ) { // user is logged in | |
| $user_id = get_current_user_id(); | |
| $post_meta_users = ( $is_comment == 1 ) ? get_comment_meta( $post_id, "_user_comment_liked" ) : get_post_meta( $post_id, "_user_liked" ); | |
| if ( count( $post_meta_users ) != 0 ) { | |
| $post_users = $post_meta_users[0]; | |
| } | |
| } else { // user is anonymous | |
| $user_id = sl_get_ip(); | |
| $post_meta_users = ( $is_comment == 1 ) ? get_comment_meta( $post_id, "_user_comment_IP" ) : get_post_meta( $post_id, "_user_IP" ); | |
| if ( count( $post_meta_users ) != 0 ) { // meta exists, set up values | |
| $post_users = $post_meta_users[0]; | |
| } | |
| } | |
| if ( is_array( $post_users ) && in_array( $user_id, $post_users ) ) { | |
| return true; | |
| } else { | |
| return false; | |
| } | |
| } // already_liked() | |
| /** | |
| * Output the like button | |
| * @since 0.5 | |
| */ | |
| function get_simple_likes_button( $post_id, $is_comment = NULL ) { | |
| $is_comment = ( NULL == $is_comment ) ? 0 : 1; | |
| $output = ''; | |
| $nonce = wp_create_nonce( 'simple-likes-nonce' ); // Security | |
| if ( $is_comment == 1 ) { | |
| $post_id_class = esc_attr( ' sl-comment-button-' . $post_id ); | |
| $comment_class = esc_attr( ' sl-comment' ); | |
| $like_count = get_comment_meta( $post_id, "_comment_like_count", true ); | |
| $like_count = ( isset( $like_count ) && is_numeric( $like_count ) ) ? $like_count : 0; | |
| } else { | |
| $post_id_class = esc_attr( ' sl-button-' . $post_id ); | |
| $comment_class = esc_attr( '' ); | |
| $like_count = get_post_meta( $post_id, "_post_like_count", true ); | |
| $like_count = ( isset( $like_count ) && is_numeric( $like_count ) ) ? $like_count : 0; | |
| } | |
| $count = get_like_count( $like_count ); | |
| $icon_empty = get_unliked_icon(); | |
| $icon_full = get_liked_icon(); | |
| // Loader | |
| $loader = '<span id="sl-loader"></span>'; | |
| // Liked/Unliked Variables | |
| if ( already_liked( $post_id, $is_comment ) ) { | |
| $class = esc_attr( ' liked' ); | |
| $title = __( 'Unlike', 'YourThemeTextDomain' ); | |
| $icon = $icon_full; | |
| } else { | |
| $class = ''; | |
| $title = __( 'Like', 'YourThemeTextDomain' ); | |
| $icon = $icon_empty; | |
| } | |
| $output = '<span class="sl-wrapper"><a href="' . admin_url( 'admin-ajax.php?action=process_simple_like' . '&post_id=' . $post_id . '&nonce=' . $nonce . '&is_comment=' . $is_comment . '&disabled=true' ) . '" class="sl-button' . $post_id_class . $class . $comment_class . '" data-nonce="' . $nonce . '" data-post-id="' . $post_id . '" data-iscomment="' . $is_comment . '" title="' . $title . '">' . $icon . $count . '</a>' . $loader . '</span>'; | |
| return $output; | |
| } // get_simple_likes_button() | |
| /** | |
| * Processes shortcode to manually add the button to posts | |
| * @since 0.5 | |
| */ | |
| add_shortcode( 'jmliker', 'sl_shortcode' ); | |
| function sl_shortcode() { | |
| return get_simple_likes_button( get_the_ID(), 0 ); | |
| } // shortcode() | |
| /** | |
| * Utility retrieves post meta user likes (user id array), | |
| * then adds new user id to retrieved array | |
| * @since 0.5 | |
| */ | |
| function post_user_likes( $user_id, $post_id, $is_comment ) { | |
| $post_users = ''; | |
| $post_meta_users = ( $is_comment == 1 ) ? get_comment_meta( $post_id, "_user_comment_liked" ) : get_post_meta( $post_id, "_user_liked" ); | |
| if ( count( $post_meta_users ) != 0 ) { | |
| $post_users = $post_meta_users[0]; | |
| } | |
| if ( !is_array( $post_users ) ) { | |
| $post_users = array(); | |
| } | |
| if ( !in_array( $user_id, $post_users ) ) { | |
| $post_users['user-' . $user_id] = $user_id; | |
| } | |
| return $post_users; | |
| } // post_user_likes() | |
| /** | |
| * Utility retrieves post meta ip likes (ip array), | |
| * then adds new ip to retrieved array | |
| * @since 0.5 | |
| */ | |
| function post_ip_likes( $user_ip, $post_id, $is_comment ) { | |
| $post_users = ''; | |
| $post_meta_users = ( $is_comment == 1 ) ? get_comment_meta( $post_id, "_user_comment_IP" ) : get_post_meta( $post_id, "_user_IP" ); | |
| // Retrieve post information | |
| if ( count( $post_meta_users ) != 0 ) { | |
| $post_users = $post_meta_users[0]; | |
| } | |
| if ( !is_array( $post_users ) ) { | |
| $post_users = array(); | |
| } | |
| if ( !in_array( $user_ip, $post_users ) ) { | |
| $post_users['ip-' . $user_ip] = $user_ip; | |
| } | |
| return $post_users; | |
| } // post_ip_likes() | |
| /** | |
| * Utility to retrieve IP address | |
| * @since 0.5 | |
| */ | |
| function sl_get_ip() { | |
| if ( isset( $_SERVER['HTTP_CLIENT_IP'] ) && ! empty( $_SERVER['HTTP_CLIENT_IP'] ) ) { | |
| $ip = $_SERVER['HTTP_CLIENT_IP']; | |
| } elseif ( isset( $_SERVER['HTTP_X_FORWARDED_FOR'] ) && ! empty( $_SERVER['HTTP_X_FORWARDED_FOR'] ) ) { | |
| $ip = $_SERVER['HTTP_X_FORWARDED_FOR']; | |
| } else { | |
| $ip = ( isset( $_SERVER['REMOTE_ADDR'] ) ) ? $_SERVER['REMOTE_ADDR'] : '0.0.0.0'; | |
| } | |
| $ip = filter_var( $ip, FILTER_VALIDATE_IP ); | |
| $ip = ( $ip === false ) ? '0.0.0.0' : $ip; | |
| return $ip; | |
| } // sl_get_ip() | |
| /** | |
| * Utility returns the button icon for "like" action | |
| * @since 0.5 | |
| */ | |
| function get_liked_icon() { | |
| /* If already using Font Awesome with your theme, replace svg with: <i class="fa fa-heart"></i> */ | |
| $icon = '<span class="sl-icon"><svg role="img" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1" x="0" y="0" viewBox="0 0 128 128" enable-background="new 0 0 128 128" xml:space="preserve"><path id="heart-full" d="M124 20.4C111.5-7 73.7-4.8 64 19 54.3-4.9 16.5-7 4 20.4c-14.7 32.3 19.4 63 60 107.1C104.6 83.4 138.7 52.7 124 20.4z"/>♥</svg></span>'; | |
| return $icon; | |
| } // get_liked_icon() | |
| /** | |
| * Utility returns the button icon for "unlike" action | |
| * @since 0.5 | |
| */ | |
| function get_unliked_icon() { | |
| /* If already using Font Awesome with your theme, replace svg with: <i class="fa fa-heart-o"></i> */ | |
| $icon = '<span class="sl-icon"><svg role="img" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1" x="0" y="0" viewBox="0 0 128 128" enable-background="new 0 0 128 128" xml:space="preserve"><path id="heart" d="M64 127.5C17.1 79.9 3.9 62.3 1 44.4c-3.5-22 12.2-43.9 36.7-43.9 10.5 0 20 4.2 26.4 11.2 6.3-7 15.9-11.2 26.4-11.2 24.3 0 40.2 21.8 36.7 43.9C124.2 62 111.9 78.9 64 127.5zM37.6 13.4c-9.9 0-18.2 5.2-22.3 13.8C5 49.5 28.4 72 64 109.2c35.7-37.3 59-59.8 48.6-82 -4.1-8.7-12.4-13.8-22.3-13.8 -15.9 0-22.7 13-26.4 19.2C60.6 26.8 54.4 13.4 37.6 13.4z"/>♥</svg></span>'; | |
| return $icon; | |
| } // get_unliked_icon() | |
| /** | |
| * Utility function to format the button count, | |
| * appending "K" if one thousand or greater, | |
| * "M" if one million or greater, | |
| * and "B" if one billion or greater (unlikely). | |
| * $precision = how many decimal points to display (1.25K) | |
| * @since 0.5 | |
| */ | |
| function sl_format_count( $number ) { | |
| $precision = 2; | |
| if ( $number >= 1000 && $number < 1000000 ) { | |
| $formatted = number_format( $number/1000, $precision ).'K'; | |
| } else if ( $number >= 1000000 && $number < 1000000000 ) { | |
| $formatted = number_format( $number/1000000, $precision ).'M'; | |
| } else if ( $number >= 1000000000 ) { | |
| $formatted = number_format( $number/1000000000, $precision ).'B'; | |
| } else { | |
| $formatted = $number; // Number is less than 1000 | |
| } | |
| $formatted = str_replace( '.00', '', $formatted ); | |
| return $formatted; | |
| } // sl_format_count() | |
| /** | |
| * Utility retrieves count plus count options, | |
| * returns appropriate format based on options | |
| * @since 0.5 | |
| */ | |
| function get_like_count( $like_count ) { | |
| $like_text = __( 'Like', 'YourThemeTextDomain' ); | |
| if ( is_numeric( $like_count ) && $like_count > 0 ) { | |
| $number = sl_format_count( $like_count ); | |
| } else { | |
| $number = $like_text; | |
| } | |
| $count = '<span class="sl-count">' . $number . '</span>'; | |
| return $count; | |
| } // get_like_count() | |
| // User Profile List | |
| add_action( 'show_user_profile', 'show_user_likes' ); | |
| add_action( 'edit_user_profile', 'show_user_likes' ); | |
| function show_user_likes( $user ) { ?> | |
| <table class="form-table"> | |
| <tr> | |
| <th><label for="user_likes"><?php _e( 'You Like:', 'YourThemeTextDomain' ); ?></label></th> | |
| <td> | |
| <?php | |
| $types = get_post_types( array( 'public' => true ) ); | |
| $args = array( | |
| 'numberposts' => -1, | |
| 'post_type' => $types, | |
| 'meta_query' => array ( | |
| array ( | |
| 'key' => '_user_liked', | |
| 'value' => $user->ID, | |
| 'compare' => 'LIKE' | |
| ) | |
| ) ); | |
| $sep = ''; | |
| $like_query = new WP_Query( $args ); | |
| if ( $like_query->have_posts() ) : ?> | |
| <p> | |
| <?php while ( $like_query->have_posts() ) : $like_query->the_post(); | |
| echo $sep; ?><a href="<?php the_permalink(); ?>" title="<?php the_title_attribute(); ?>"><?php the_title(); ?></a> | |
| <?php | |
| $sep = ' · '; | |
| endwhile; | |
| ?> | |
| </p> | |
| <?php else : ?> | |
| <p><?php _e( 'You do not like anything yet.', 'YourThemeTextDomain' ); ?></p> | |
| <?php | |
| endif; | |
| wp_reset_postdata(); | |
| ?> | |
| </td> | |
| </tr> | |
| </table> | |
| <?php } // show_user_likes() |
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