MySQL | 
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CREATE TABLE `comment` (
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`name` varchar(50) collate latin1_general_ci NOT NULL,
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`mail` varchar(50) collate latin1_general_ci NOT NULL,
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`url` varchar(50) collate latin1_general_ci NOT NULL,
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`comment` longtext collate latin1_general_ci NOT NULL
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)

 HTML | 
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<form name=”commentform” action=”comments-post.php” method=”post” id=”commentform”>
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<table width=”468? border=”0? cellspacing=”3? cellpadding=”3?>
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<tr>
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<td width=”103?>Name</td>
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<td width=”344?><input name=”name” type=”text” id=”name” tabindex=”1? value=”" size=”18? /></td>
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</tr>
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<tr>
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<td>Mail</td>
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<td><input type=”text” name=”email” id=”email” value=”" size=”18? tabindex=”2? /></td>
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</tr>
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<tr>
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<td>URL</td>
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<td><input type=”text” name=”url” id=”url” value=”" size=”18? tabindex=”3? /></td>
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</tr>
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<tr>
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<td>Enter Number </td>
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<td><input name=”txtNumber” type=”text” id=”txtNumber” value=”" tabindex=”4?/>
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<img src=”randImages.php”/></td>
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</tr>
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<tr>
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<td>Comment</td>
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<td><textarea name=”comment” id=”comment” cols=”45? rows=”9? tabindex=”5?></textarea></td>
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</tr>
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<tr>
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<td>&nbsp;</td>
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<td><input name=”save” type=”submit” class=”submitbutton” id=”save” tabindex=”5? onClick=”MM_validateForm(’name’,”,’R',’email’,”,’RisEmail’,'comment’,”,’R');return document.MM_returnValue” value=”Submit Comment”/></td>
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</tr>
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</table>
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</form>

 PHP | 
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session_start();
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// $Rand Function generate 5 digit random number starting 10000, 99999. You can Edit it as your required.
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$rand = rand(10000, 99999);
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// create the hash for the random number and put it in the session
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$_SESSION['image_random_value'] = md5($rand);
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// create the image
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$image = imagecreate(60, 30);
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// use white as the background image
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$bgColor = imagecolorallocate ($image, 255, 255, 255);
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// the text color is black
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$textColor = imagecolorallocate ($image, 0, 0, 0);
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// write the random number
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imagestring ($image, 5, 5, 8, $rand, $textColor);
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// send several headers to make sure the image is not cached
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// taken directly from the PHP Manual
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// Date in the past
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header(”Expires: Mon, 10 April 2008 05:00:00 GMT”);
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// always modified
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header(”Last-Modified: ” . gmdate(”D, d M Y H:i:s”) . ” GMT”);
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// HTTP/1.1
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header(”Cache-Control: no-store, no-cache, must-revalidate”);
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header(”Cache-Control: post-check=0, pre-check=0?, false);
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// HTTP/1.0
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header(”Pragma: no-cache”);
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// send the content type header so the image is displayed properly
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header(’Content-type: image/jpeg’);
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// send the image to the browser
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imagejpeg($image);
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// destroy the image to free up the memory
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imagedestroy($image);
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?>
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Now Create a page which insert the comment data.
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session_start();
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//Enter here your php mysql connection details
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if(isset($_POST['save'])){
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$name=$_POST['name'];
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$email=$_POST['email'];
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$url=$_POST['url'];
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$comment=$_POST['comment'];
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}
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$number = $_POST['txtNumber'];
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if (md5($number) == $_SESSION['image_random_value']) {
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$sql=”INSERT into comment(name, mail, url, comment) values(’$name’, ‘$email’, ‘$url’,
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‘$comment’)”;
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$result=mysql_query($sql) or die(’Can not Add Your Comment’);
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echo “Your Comment have been added. Returning To Write Return page here. Please wait…”;
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$_SESSION['image_random_value'] = ”;
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}
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} else {
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echo ‘Sorry, wrong Image Varification Number. Please try again’;
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}
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?>

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