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<?php
/**
* Create post like for posts
*
* Idea from Jon Masterson < http://jonmasterson.com/ >
* @since 1.0
*/
add_action( 'wp_ajax_nopriv_penci_post_like', 'penci_post_like_callback' );
add_action( 'wp_ajax_penci_post_like', 'penci_post_like_callback' );
function penci_post_like_callback() {
$nonce = $_POST['nonce'];
if ( ! wp_verify_nonce( $nonce, 'ajax-nonce' ) ) {
die ( 'Nope!' );
}
if ( isset( $_POST['penci_post_like'] ) ) {
$post_id = $_POST['post_id']; // post id
$post_like_count = get_post_meta( $post_id, "_post_like_count", true ); // post like count
if ( function_exists( 'wp_cache_post_change' ) ) { // invalidate WP Super Cache if exists
$GLOBALS["super_cache_enabled"] = 1;
wp_cache_post_change( $post_id );
}
if ( is_user_logged_in() ) { // user is logged in
$user_id = get_current_user_id(); // current user
$meta_POSTS = get_user_option( "_liked_posts", $user_id ); // post ids from user meta
$meta_USERS = get_post_meta( $post_id, "_user_liked" ); // user ids from post meta
$liked_POSTS = null; // setup array variable
$liked_USERS = null; // setup array variable
$count_meta_post = is_array( $meta_POSTS ) || is_object( $meta_POSTS ) ? count( $meta_POSTS ) : 0;
$count_meta_users = is_array( $meta_USERS ) || is_object( $meta_USERS ) ? count( $meta_USERS ) : 0;
if ( $count_meta_post != 0 ) { // meta exists, set up values
$liked_POSTS = $meta_POSTS;
}
if ( ! is_array( $liked_POSTS ) ) // make array just in case
{
$liked_POSTS = array();
}
if ( $count_meta_users != 0 ) { // meta exists, set up values
$liked_USERS = $meta_USERS[0];
}
if ( ! is_array( $liked_USERS ) ) // make array just in case
{
$liked_USERS = array();
}
$liked_POSTS[ 'post-' . $post_id ] = $post_id; // Add post id to user meta array
$liked_USERS[ 'user-' . $user_id ] = $user_id; // add user id to post meta array
$user_likes = count( (array)$liked_POSTS ); // count user likes
if ( ! penci_Already_Liked( $post_id ) ) { // like the post
update_post_meta( $post_id, "_user_liked", $liked_USERS ); // Add user ID to post meta
update_post_meta( $post_id, "_post_like_count", ++ $post_like_count ); // +1 count post meta
update_user_option( $user_id, "_liked_posts", $liked_POSTS ); // Add post ID to user meta
update_user_option( $user_id, "_user_like_count", $user_likes ); // +1 count user meta
echo absint( $post_like_count ); // update count on front end
} else { // unlike the post
$pid_key = array_search( $post_id, $liked_POSTS ); // find the key
$uid_key = array_search( $user_id, $liked_USERS ); // find the key
unset( $liked_POSTS[ $pid_key ] ); // remove from array
unset( $liked_USERS[ $uid_key ] ); // remove from array
$user_likes = count( (array)$liked_POSTS ); // recount user likes
update_post_meta( $post_id, "_user_liked", $liked_USERS ); // Remove user ID from post meta
update_post_meta( $post_id, "_post_like_count", -- $post_like_count ); // -1 count post meta
update_user_option( $user_id, "_liked_posts", $liked_POSTS ); // Remove post ID from user meta
update_user_option( $user_id, "_user_like_count", $user_likes ); // -1 count user meta
echo "already" . absint( $post_like_count ); // update count on front end
}
} else { // user is not logged in (anonymous)
$ip = $_SERVER['REMOTE_ADDR']; // user IP address
$meta_IPS = get_post_meta( $post_id, "_user_IP" ); // stored IP addresses
$liked_IPS = null; // set up array variable
$count_meta_IPS = is_array( $meta_IPS ) || is_object( $meta_IPS ) ? count( $meta_IPS ) : 0;
if ( $count_meta_IPS != 0 ) { // meta exists, set up values
$liked_IPS = $meta_IPS[0];
}
if ( ! is_array( $liked_IPS ) ) // make array just in case
{
$liked_IPS = array();
}
if ( ! in_array( $ip, $liked_IPS ) ) // if IP not in array
{
$liked_IPS[ 'ip-' . $ip ] = $ip;
} // add IP to array
if ( ! penci_Already_Liked( $post_id ) ) { // like the post
update_post_meta( $post_id, "_user_IP", $liked_IPS ); // Add user IP to post meta
update_post_meta( $post_id, "_post_like_count", ++ $post_like_count ); // +1 count post meta
echo absint( $post_like_count ); // update count on front end
} else { // unlike the post
$ip_key = array_search( $ip, $liked_IPS ); // find the key
unset( $liked_IPS[ $ip_key ] ); // remove from array
update_post_meta( $post_id, "_user_IP", $liked_IPS ); // Remove user IP from post meta
update_post_meta( $post_id, "_post_like_count", -- $post_like_count ); // -1 count post meta
echo "already" . absint( $post_like_count ); // update count on front end
}
}
}
wp_send_json_success( );
}
/**
* Check if user is liked post
*/
function penci_Already_Liked( $post_id ) { // test if user liked before
if ( is_user_logged_in() ) { // user is logged in
$user_id = get_current_user_id(); // current user
$meta_USERS = get_post_meta( $post_id, "_user_liked" ); // user ids from post meta
$liked_USERS = ""; // set up array variable
$count_meta_USERS = is_array( $meta_USERS ) || is_object( $meta_USERS ) ? count( $meta_USERS ) : 0;
if ( $count_meta_USERS != 0 ) { // meta exists, set up values
$liked_USERS = $meta_USERS[0];
}
if ( ! is_array( $liked_USERS ) ) // make array just in case
{
$liked_USERS = array();
}
if ( in_array( $user_id, $liked_USERS ) ) { // True if User ID in array
return true;
}
return false;
} else { // user is anonymous, use IP address for voting
$meta_IPS = get_post_meta( $post_id, "_user_IP" ); // get previously voted IP address
$ip = $_SERVER["REMOTE_ADDR"]; // Retrieve current user IP
$liked_IPS = ""; // set up array variable
$count_meta_IPS = is_array( $meta_IPS ) || is_object( $meta_IPS ) ? count( $meta_IPS ) : 0;
if ( $count_meta_IPS != 0 ) { // meta exists, set up values
$liked_IPS = $meta_IPS[0];
}
if ( ! is_array( $liked_IPS ) ) // make array just in case
{
$liked_IPS = array();
}
if ( in_array( $ip, $liked_IPS ) ) { // True is IP in array
return true;
}
return false;
}
}
/**
* Front end button like post
*/
function penci_get_post_like_link( $post_id, $show = false, $class_pre ="" ) {
$like_count = get_post_meta( $post_id, "_post_like_count", true ); // get post likes
if ( ! $like_count ): $like_count = '0'; endif;
if ( penci_Already_Liked( $post_id ) ) {
$class = esc_attr( ' liked' );
$title = esc_html__( 'Unlike', 'penci-framework' );
} else {
$class = '';
$title = esc_html__( 'Like', 'penci-framework' );
}
$output = '<a href="#" class="penci-post-like penci_post-meta_item ' . $class . ' ' . $class_pre. '" data-post_id="' . $post_id . '" title="' . $title . '" data-like="' . esc_html__( 'Like', 'penci-framework' ) . '" data-unlike="' . esc_html__( 'Unlike', 'penci-framework' ) . '"><i class="fa fa-thumbs-o-up"></i><span class="penci-share-number">' . sanitize_text_field( $like_count ) . '</span></a>';
if ( ! $show ) {
return $output;
}
echo $output;
}
/**
* Front end button like post in single
*/
function penci_single_get_PostLikeLink( $post_id ) {
$like_count = get_post_meta( $post_id, "_post_like_count", true ); // get post likes
if ( ! $like_count ): $like_count = '0'; endif;
if ( penci_Already_Liked( $post_id ) ) {
$class = esc_attr( ' liked' );
$title = esc_html__( 'Unlike', 'penci-framework' );
} else {
$class = '';
$title = esc_html__( 'Like', 'penci-framework' );
}
$return = '<span class="count-number-like">' . sanitize_text_field( $like_count ) . '</span><a class="penci-post-like single-like-button' . $class . '" data-post_id="' . $post_id . '" title="' . $title . '" data-like="' . esc_html__( 'Like', 'penci-framework' ) . '" data-unlike="' . esc_html__( 'Unlike', 'penci-framework' ) . '"><i class="fa fa-heart-o"></i></a>';
return $return;
}
/**
* Front end count like post
*/
function penci_get_PostCountLike( $post_id ) {
$like_count = get_post_meta( $post_id, "_post_like_count", true ); // get post likes
$count = ( ! isset( $like_count ) || empty( $like_count ) ) ? '0' : $like_count;
return $count;
}
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