Cómo crear un sistema de likes y dislikes en PHP, MySQL y jQuery
En este artículo te explicaremos cómo implementar un sistema de likes y dislikes, similar al de muchas redes sociales como YouTube, para que lo puedas poner en práctica en tus propios proyectos. Para ello utilizaremos PHP y MySQL, y también un poco de jQuery para la parte del frontoffice. Este desarrollo es muy útil para esos sitios web que cuentan con reviews de usuarios, o con contenido subido por los propios usuarios.
Datos de la base de datos
Nombre de la base de datos: programacionnet
Nombre de la primera tabla: products
Nombre de la segunda tabla: like
Nombre de la primera tabla: products
Nombre de la segunda tabla: like
db.sql
Ejecuta este script SQL en tu PHPMyAdmin o gestor de base de datos para crear las tablas:
-- -- Table structure for table `likes` -- CREATE TABLE `likes` ( `id` int(5) NOT NULL AUTO_INCREMENT, `pid` int(10) NOT NULL, `like` int(10) NOT NULL, `unlike` int(10) NOT NULL, `uid` varchar(100) NOT NULL, PRIMARY KEY (`id`) ) ENGINE=MyISAM AUTO_INCREMENT=1; -- -------------------------------------------------------- -- -- Table structure for table `products` -- CREATE TABLE `products` ( `id` int(11) NOT NULL AUTO_INCREMENT, `product_name` varchar(255) NOT NULL, `price` double(10,2) NOT NULL DEFAULT '0.00', `image` varchar(255) NOT NULL, `status` int(2) NOT NULL DEFAULT '1', PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=4; -- -- Dumping data for table `products` -- INSERT INTO `products` VALUES (1, 'PHP Books', 20.00, '1.jpg', 1); INSERT INTO `products` VALUES (2, 'Javascript Books', 10.00, '2.jpg', 1); INSERT INTO `products` VALUES (3, 'ASP Books', 100.00, '3.jpg', 1);
db.php
Edita este fichero para configurar tus credenciales de la base de datos:
<?php define('DB_SERVER', 'localhost'); define('DB_USERNAME', 'username'); define('DB_PASSWORD', 'password'); define('DB_DATABASE', 'database'); $connection = mysqli_connect(DB_SERVER,DB_USERNAME,DB_PASSWORD,DB_DATABASE); ?>
index.php
Contiene el código PHP necesario para modificar los registros de la tabla y mostrar el número actual en el fichero. También en el fichero, utilizamos cookies para escapar de aquellos likes y dislikes invalidos.
El archivo principal muestra el listado de productos y los botones de like:
<?php session_start(); include("db.php"); if(!isset($_SESSION['user'])) { $_SESSION['user'] = session_id(); } $uid = $_SESSION['user']; // set your user id settings $query = "SELECT * FROM `products`"; // products list $res = mysqli_query($connection,$query); while($row=mysqli_fetch_array($res)) { // get likes and dislikes of a product $query = mysqli_query($connection,"select sum(`like`) as `like`,sum(`unlike`) as `unlike` from `likes` where pid = ".$row['id']); $rowCount = mysqli_fetch_array($query); if($rowCount['like'] == "") $rowCount['like'] = 0; if($rowCount['unlike'] == "") $rowCount['unlike'] = 0; if($uid == "") // if user not loggedin then show login link on like button click { $like = ' <input onclick="location.href = 'login.php';" type="button" value="'.$rowCount['like'].'" rel="'.$row['id'].'" data-toggle="tooltip" data-placement="top" title="Login to Like" class="button_like" /> <input onclick="location.href = 'login.php';" type="button" value="'.$rowCount['unlike'].'" rel="'.$row['id'].'" data-toggle="tooltip" data-placement="top" title="Login to Unlike" class="button_unlike" />'; } else { $query = mysqli_query($connection,"SELECT * from `likes` WHERE pid='".$row['id']."' and uid='".$uid."'"); if(mysqli_num_rows($query)>0){ if already liked od disliked a product $likeORunlike = mysqli_fetch_array($query); // clear values of variables $liked = ''; $unliked = ''; $disable_like = ''; $disable_unlike = ''; if($likeORunlike['like'] == 1) // if alredy liked then disable like button { $liked = 'disabled="disabled"'; $disable_unlike = "button_disable"; } elseif($likeORunlike['unlike'] == 1) // if alredy dislike the disable unlike button { $unliked = 'disabled="disabled"'; $disable_like = "button_disable"; } $like = ' <input '.$liked.' type="button" value="'.$rowCount['like'].'" rel="'.$row['id'].'" data-toggle="tooltip" data-placement="top" title="Like" class="button_like '.$disable_like.'" id="linkeBtn_'.$row['id'].'" /> <input '.$unliked.' type="button" value="'.$rowCount['unlike'].'" rel="'.$row['id'].'" data-toggle="tooltip" data-placement="top" title="Un-Like" class="button_unlike '.$disable_unlike.'" id="unlinkeBtn_'.$row['id'].'" /> '; } else{ //not liked and disliked product $like = ' <input type="button" value="'.$rowCount['like'].'" rel="'.$row['id'].'" data-toggle="tooltip" data-placement="top" title="Like" class="button_like" id="linkeBtn_'.$row['id'].'" /> <input type="button" value="'.$rowCount['unlike'].'" rel="'.$row['id'].'" data-toggle="tooltip" data-placement="top" title="Un-Like" class="button_unlike" id="unlinkeBtn_'.$row['id'].'" /> '; } } $HTML.=' <li> <img src="images/'.$row['image'].'" class=""> <h4 class="">'.$row['product_name'].'</h4> <div class="product-price"> <span class="normal-price">$'.$row['price'].'</span> </div> <a href="#" class="btn btn-default navbar-btn" >Buy Now</a> <div class="grid"> '.$like.' </div> </li>'; } ?> <!doctype html> <head> <title>Create Like & Unlike System in PHP MySQL and jQuery [Improved] | PHPGang.com</title> <meta http-equiv="Content-Type" content="text/html;charset=utf-8" /> <script type="text/javascript" src="jquery-1.8.0.min.js"></script> <script type="text/javascript" src="script.js"></script> <link href="style.css" rel="stylesheet" type="text/css" /> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css"> </head> <body> <div class="container"> <div class="row"> <h1>Shopping store</h1> <div class="col-sm-12 col-md-12"> <ul class="thumbnail-list"> <?php echo $HTML; ?> </ul> </div> </div> </div> </body> </html>
Para enviar la acción del botón de like (o dislike) utiliza el código de abajo:
<?phpif($_POST) { $pid = mysqli_real_escape_string($connection,$_POST['pid']); // product id $op = mysqli_real_escape_string($connection,$_POST['op']); // like or unlike op if($op == "like") { $gofor = "like"; } elseif($op == "unlike") { $gofor = "unlike"; } else { exit; } // check if alredy liked or not query $query = mysqli_query($connection,"SELECT * from `likes` WHERE pid='".$pid."' and uid='".$uid."'"); $num_rows = mysqli_num_rows($query); if($num_rows>0) // check if alredy liked or not condition { $likeORunlike = mysqli_fetch_array($query); if($likeORunlike['like'] == 1) // if alredy liked set unlike for alredy liked product { mysqli_query($connection,"update `likes` set `unlike`=1,`like`=0 where id='".$likeORunlike['id']."' and uid='".$uid."'"); echo 2; } elseif($likeORunlike['unlike'] == 1) // if alredy unliked set like for alredy unliked product { mysqli_query($connection,"update `likes` set `like`=1,`unlike`=0 where id='".$likeORunlike['id']."' and uid='".$uid."'"); echo 2; } } else // New Like { mysqli_query($connection,"INSERT INTO `likes` (`pid`,`uid`, `$gofor`) VALUES ('$pid','$uid','1')"); echo 1; } exit; } ?>
Fuente: phpgang.com
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