handlelikedata.php - 5/2/13

<?php
/**
 * Used for the like/unlike function.
 *
 * @package memepls
 * @since memepls 1.0
 */

require_once '../../../wp-config.php';

global $wpdb;

//get request data
$post_id = (int)$_POST['post_id'];
$author_post = $_POST['user_id']; //only use this var to get $user_id
$task = $_POST['task'];
$ip = $_SERVER['REMOTE_ADDR'];

$author = get_user_by('login', $author_post);
$author_id = $author->ID; //used in db


//messages
$memepls_like_dislike_login_message = 'You are required to login to vote.';
$memepls_like_dislike_voted_message = 'You\'ve voted already.';
$memepls_like_dislike_thank_message = 'Thank you for voting';

//get setting data
$is_logged_in = is_user_logged_in();
$can_vote = false;

if(!$is_logged_in) {
    //user needs to login to vote but has not logged in
    $error = 1;
    $msg = $memepls_like_dislike_login_message;
} else {
    $has_already_voted = HasUserAlreadyVoted($post_id, $ip);
    $datetime_now = date('Y-m-d H:i:s');

    if($has_already_voted) {
        //user can vote only once and has already voted.
        $error = 1;
        $msg = $memepls_like_dislike_voted_message;
    } else {
        if(!$has_already_voted) {
            //never voted befor so can vote
            $can_vote = true;
        }
    }
}

if($can_vote) {
    $current_user = wp_get_current_user();
    $user_id = (int)$current_user->ID;

    if($task == "like") {
        if(!$has_already_voted) {
            $query = "INSERT INTO {$wpdb->prefix}memepls_like_dislike SET ";
            $query .= "post_id = '" . $post_id . "', ";
            $query .= "value = '1', ";
            $query .= "date_time = '" . date('Y-m-d H:i:s') . "', ";
            $query .= "ip = '$ip'";
        }
    } else {
        if(!$has_already_voted) {
            $query = "INSERT INTO {$wpdb->prefix}memepls_like_dislike SET ";
            $query .= "post_id = '" . $post_id . "', ";
            $query .= "value = '-1', ";
            $query .= "date_time = '" . date('Y-m-d H:i:s') . "', ";
            $query .= "ip = '$ip'";
        }
    }
    //echo $query;
    $success = $wpdb->query($query);

    if($success) {
        $error = 0;
        $msg = $memepls_like_dislike_thank_message;
    } else {
        $error = 1;
        $msg = __('Could not process your vote.', 'memepls_like_dislike');
    }
}

$like_count = GetLikeCount($post_id);
$unlike_count = GetUnlikeCount($post_id);

$result = array("msg" => $msg, "error" => $error, "like" => $like_count, "unlike" => $unlike_count);

echo json_encode($result);