The rating system<\/b> is very helpful to know what the audience think about your idea. Not only the idea but also the user can rate different products or services. Rating helps the user to give their thought and differentiate how good or bad a products or service is. Also, it helps the owner to understand the drawbacks of products and know whether the product meets customer expectations or not.<\/p>\n
If you want to get the customer feedback, the rating system is very useful. Through the rating system, web admin can track the visitor’s like and dislike. Also, it will help webmaster to understand the visitor’s choices and make their website more interactive with the visitors. Most of the e-commerce websites or blogs implement the rating system to obtain customer or audience review.<\/p>\n
The rating system functionality can be easily implemented using jQuery and PHP. In this tutorial, we will show you how to build a simple rating system using jQuery, Ajax, PHP, and MySQL<\/b>. The example rating system takes the visitor’s like or dislike with jQuery and Ajax. Also, the rating data is stored in the database using PHP and MySQL. Once the total number of likes and dislikes is calculated, it will be displayed to the visitors. We will make the whole process simple and you can implement the rating system in your project very easily.<\/p>\n
The OOP concept in PHP<\/b> will be used to make the whole script lightweight, simple and easy to extend. The following functionality will be implemented in the like dislike rating system using PHP.<\/p>\n To store the post data, a table needs to be created in the database and two fields needed to holds the like and dislike number. The following SQL creates a The Post class handles all the operations related to the database. For example, connect to the MySQL database server, insert, update, and delete post data in the database. Specify the database host (\n
Create Database Table<\/h2>\n
posts<\/code> table with some basic fields in the MySQL database.<\/p>\nCREATE<\/span> TABLE<\/span> `posts<\/span>` (\r\n `id`<\/span> int<\/span>(11<\/span>) NOT NULL<\/span> AUTO_INCREMENT,\r\n `title`<\/span> varchar<\/span>(255<\/span>) COLLATE utf8_unicode_ci NOT NULL<\/span>,\r\n `content`<\/span> text<\/span> COLLATE utf8_unicode_ci NOT NULL<\/span>,\r\n `image`<\/span> varchar<\/span>(255<\/span>) COLLATE utf8_unicode_ci NOT NULL<\/span>,\r\n `like_num`<\/span> bigint<\/span>(10<\/span>) NOT NULL<\/span>,\r\n `dislike_num`<\/span> bigint<\/span>(10<\/span>) NOT NULL<\/span>,\r\n `created`<\/span> datetime NOT NULL<\/span>,\r\n `modified`<\/span> datetime NOT NULL<\/span>,\r\n `status`<\/span> enum('1'<\/span>,'0'<\/span>) COLLATE utf8_unicode_ci NOT NULL<\/span> DEFAULT '1'<\/span> COMMENT '1=Active, 0=Inactive'<\/span>,\r\n PRIMARY KEY<\/span> (`id`<\/span>)\r\n) ENGINE=<\/span>InnoDB DEFAULT CHARSET=<\/span>utf8 COLLATE=<\/span>utf8_unicode_ci;\r\n<\/pre>\nPost Class (Post.class.php)<\/h2>\n
$dbHost<\/code>), username ($dbUsername<\/code>), password ($dbPassword<\/code>), and name ($dbName<\/code>) as per your database server credentials.<\/p>\n\n
__constructor()<\/code> – Connect to the MySQL database.<\/li>\ngetRows()<\/code> – Fetch records from the posts table and returns the post data as an array based on the specified conditions.<\/li>\ninsert()<\/code> – Insert post data in the posts table.<\/li>\nupdate()<\/code> – Update post data in the posts table.<\/li>\n<\/ul>\n<?php
<\/span>\/*
* Post Class
* This class is used for database related (connect, insert, and update) operations
* @author CodexWorld.com
* @url http:\/\/www.codexworld.com
* @license http:\/\/www.codexworld.com\/license
*\/
<\/span>class <\/span>Post<\/span>{
private <\/span>$dbHost <\/span>= <\/span>\"localhost\"<\/span>;
private <\/span>$dbUsername <\/span>= <\/span>\"root\"<\/span>;
private <\/span>$dbPassword <\/span>= <\/span>\"root\"<\/span>;
private <\/span>$dbName <\/span>= <\/span>\"codexworld\"<\/span>;
private <\/span>$tblName <\/span>= <\/span>\"posts\"<\/span>;
public function <\/span>__construct<\/span>(){
if(!isset(<\/span>$this<\/span>-><\/span>db<\/span>)){
<\/span>\/\/ Connect to the database
<\/span>$conn <\/span>= new <\/span>mysqli<\/span>(<\/span>$this<\/span>-><\/span>dbHost<\/span>, <\/span>$this<\/span>-><\/span>dbUsername<\/span>, <\/span>$this<\/span>-><\/span>dbPassword<\/span>, <\/span>$this<\/span>-><\/span>dbName<\/span>);
if(<\/span>$conn<\/span>-><\/span>connect_error<\/span>){
die(<\/span>\"Failed to connect with MySQL: \" <\/span>. <\/span>$conn<\/span>-><\/span>connect_error<\/span>);
}else{
<\/span>$this<\/span>-><\/span>db <\/span>= <\/span>$conn<\/span>;
}
}
}
<\/span>\/*
* Returns rows from the database based on the conditions
* @param string name of the table
* @param array select, where, order_by, limit and return_type conditions
*\/
<\/span>public function <\/span>getRows<\/span>(<\/span>$conditions <\/span>= array()){
<\/span>$sql <\/span>= <\/span>'SELECT '<\/span>;
<\/span>$sql <\/span>.= <\/span>array_key_exists<\/span>(<\/span>\"select\"<\/span>,<\/span>$conditions<\/span>)?<\/span>$conditions<\/span>[<\/span>'select'<\/span>]:<\/span>'*'<\/span>;
<\/span>$sql <\/span>.= <\/span>' FROM '<\/span>.<\/span>$this<\/span>-><\/span>tblName<\/span>;
if(<\/span>array_key_exists<\/span>(<\/span>\"where\"<\/span>,<\/span>$conditions<\/span>)){
<\/span>$sql <\/span>.= <\/span>' WHERE '<\/span>;
<\/span>$i <\/span>= <\/span>0<\/span>;
foreach(<\/span>$conditions<\/span>[<\/span>'where'<\/span>] as <\/span>$key <\/span>=> <\/span>$value<\/span>){
<\/span>$pre <\/span>= (<\/span>$i <\/span>> <\/span>0<\/span>)?<\/span>' AND '<\/span>:<\/span>''<\/span>;
<\/span>$sql <\/span>.= <\/span>$pre<\/span>.<\/span>$key<\/span>.<\/span>\" = '\"<\/span>.<\/span>$value<\/span>.<\/span>\"'\"<\/span>;
<\/span>$i<\/span>++;
}
}
if(<\/span>array_key_exists<\/span>(<\/span>\"order_by\"<\/span>,<\/span>$conditions<\/span>)){
<\/span>$sql <\/span>.= <\/span>' ORDER BY '<\/span>.<\/span>$conditions<\/span>[<\/span>'order_by'<\/span>];
}
if(<\/span>array_key_exists<\/span>(<\/span>\"start\"<\/span>,<\/span>$conditions<\/span>) && <\/span>array_key_exists<\/span>(<\/span>\"limit\"<\/span>,<\/span>$conditions<\/span>)){
<\/span>$sql <\/span>.= <\/span>' LIMIT '<\/span>.<\/span>$conditions<\/span>[<\/span>'start'<\/span>].<\/span>','<\/span>.<\/span>$conditions<\/span>[<\/span>'limit'<\/span>];
}elseif(!<\/span>array_key_exists<\/span>(<\/span>\"start\"<\/span>,<\/span>$conditions<\/span>