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<?php
/**
* Add "like" functionality to your plugin
*
* @author ThemeZilla
* @package Kata Plus
* @since 1.0.0
*/
// Don't load directly.
if ( ! defined( 'ABSPATH' ) ) {
exit;
}
if ( ! class_exists( 'Kata_Plus_Zilla_Likes' ) ) {
class Kata_Plus_Zilla_Likes {
/**
* Constructor.
*
* @since 1.0.0
*/
function __construct() {
add_action( 'publish_post', array( &$this, 'setup_likes' ) );
add_action( 'wp_ajax_zilla-likes', array( &$this, 'ajax_callback' ) );
add_action( 'wp_ajax_nopriv_zilla-likes', array( &$this, 'ajax_callback' ) );
}
/**
* Setup likes.
*
* @since 1.0.0
*/
function setup_likes( $post_id ) {
if ( ! is_numeric( $post_id ) ) {
return;
}
add_post_meta( $post_id, '_zilla_likes', '0', true );
}
/**
* Run ajax.
*
* @since 1.0.0
*/
function ajax_callback( $post_id ) {
$likes_id = sanitize_text_field( $_POST['likes_id'] );
if ( isset( $likes_id ) ) {
// Click event. Get and Update Count
$post_id = str_replace( 'zilla-likes-', '', $likes_id );
echo $this->like_this( $post_id, 'update' );
} else {
// AJAXing data in. Get Count
$post_id = sanitize_text_field( $_POST['post_id'] );
$post_id = str_replace( 'zilla-likes-', '', $post_id );
echo $this->like_this( $post_id, 'get' );
}
exit;
}
/**
* Like this.
*
* @since 1.0.0
*/
function like_this( $post_id, $action = 'get' ) {
if ( ! is_numeric( $post_id ) ) {
return;
}
switch ( $action ) {
case 'get':
$likes = get_post_meta( $post_id, '_zilla_likes', true );
if ( ! $likes ) {
$likes = 0;
add_post_meta( $post_id, '_zilla_likes', $likes, true );
}
return Kata_Plus_Helpers::get_icon( 'font-awesome', 'heart' ) . '<span class="zilla-likes-count">' . $likes . '</span>';
break;
case 'update':
$likes = get_post_meta( $post_id, '_zilla_likes', true );
if ( isset( $_COOKIE[ 'zilla_likes_' . $post_id ] ) ) {
--$likes;
unset( $_COOKIE[ 'zilla_likes_' . $post_id ] );
setcookie( 'zilla_likes_' . $post_id, $post_id, time() - ( 10 * 365 * 24 * 60 * 60 ), '/' );
} else {
++$likes;
setcookie( 'zilla_likes_' . $post_id, $post_id, time() + ( 10 * 365 * 24 * 60 * 60 ), '/' );
}
update_post_meta( $post_id, '_zilla_likes', $likes );
return Kata_Plus_Helpers::get_icon( 'font-awesome', 'heart' ) . '<span class="zilla-likes-count">' . $likes . '</span>';
break;
}
}
/**
* Do likes.
*
* @since 1.0.0
*/
function do_likes() {
global $post;
$output = $this->like_this( $post->ID );
$class = 'zilla-likes';
$title = __( 'Like this', 'kata-plus' );
if ( isset( $_COOKIE[ 'zilla_likes_' . $post->ID ] ) ) {
$class = 'zilla-likes active';
$title = __( 'You already like this', 'kata-plus' );
}
return '<a href="#" class="' . $class . '" id="zilla-likes-' . $post->ID . '" data-id="' . $post->ID . '" title="' . $title . '">' . $output . '</a>';
}
}
global $zilla_likes;
$zilla_likes = new Kata_Plus_Zilla_Likes();
function zilla_likes() {
global $zilla_likes;
echo $zilla_likes->do_likes();
}
}