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A Poll/Rating system in PHP and MySQL

Before you start this lesson, please read the following lessons for your reference:

This lesson will show you how to create a simple poll/rating system in PHP and MySQL. The could be used for any number of items you want to rate without changing a bit.

You may use it to do opinion poll, rate your software,images, news, music,anything.

Here is the example:

Vote for this tutorial
Warning: mysql_connect(): Access denied for user 'chinesel_hsun'@'localhost' (using password: YES) in /home1/chinesel/public_html/kidslovepc/php-tutorial/pollresult.php on line 15
Unable to specified database

This tutorial includes 3 sections:

  1. Create database : how to save polling/rating results in MySQL
  2. Dealing poll/rate Form: how to saving polling/rating result to database and how to set cookie to prevent client repeat voting on the same item.
  3. Retrieve poll/rate result: retrieve poll/rate result for item and assign corresponding poll/rate icon to it.

Retrieve poll/rate result from MySQL database

Usually we need an icon to indicate a polling/rating result, such as like this:

These icons should respond to the polling result in database. The following code will assign an proper icon to a item according to its polling result in database.

Assume we need put an icon besides item 1 and polling result like result/votes(for example 3.2/46) by <?php include("pollresult.php?id=1")?>. Note that this including code should be used in .php file. If you use other HTML file, please use corresponding server side include.

Here is pollresult.php code:


//get item id

//get polling result from database

//open database connection
$username = "yourname";
$password = "yourpass"; //input your password here.
$database = "yourdb";
//connect to database
$link = mysql_connect(localhost,$username,$password);
@mysql_select_db($database) or die("<b>Unable to specified database</b>");

//retrievevoting result
$query = "select votes,result from polling where itemid=$id";
$result = mysql_query($query) or die('Error, query failed');

$votes = mysql_result($result,0,"votes");
$voteResult = mysql_result($result,0,"result");

//assign icons
$digit1 = substr( $voteResult,0,1); //get first digit;
$digit2 = substr( $voteResult,2,1); //the last digit;

if (strcmp($digit2,"0") == 0 )
$half ="";
$half = "half";

echo "<img src=\"images/$digit1$half.gif\"> $voteResult/$votes";

pollresult.php pulls voting result from database and display proper icon based on polling results.

$voteResult = mysql_result($result,0,"result"); gives the polling result in database.

$digit1 is the first digit of polling result. $digti2 is the last digit of polling result. For example, if polling result is 2.4, $digit1 is 2, $digit2 is 4.

if $digit2 is not 0, will assign an icon with "half" in its name, such as 2half.gif

The following icons are used by this example


Here are some other polling icons:





Back: dealing with poll/rate form
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