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<?php session_start(); if(isset($_POST['Submit'])){ // code for check server side validation if(empty($_SESSION['captcha_code'] ) || strcasecmp($_SESSION['captcha_code'], $_POST['captcha_code']) != 0){ $msg="<span style='color:red'>The Validation code does not match!</span>";// Captcha verification is incorrect. }else{// Captcha verification is Correct. Final Code Execute here! $msg="<span style='color:green'>The Validation code has been matched.</span>"; } } ?> <!doctype html> <html> <head> <meta charset="utf-8"> <title>PHP Secure Professional Captcha.</title> <link href="./css/style.css" rel="stylesheet"> <script type='text/javascript'> function refreshCaptcha(){ var img = document.images['captchaimg']; img.src = img.src.substring(0,img.src.lastIndexOf("?"))+"?rand="+Math.random()*1000; } </script> </head> <body> <div id="frame0"> <h1>PHP Secure Professional Captcha Demo.</h1> <p>More tutorials <a href="http://www.w3schools.in/">www.w3schools.in</a></p> </div> <br> <form action="" method="post" name="form1" id="form1" > <table width="400" border="0" align="center" cellpadding="5" cellspacing="1" class="table"> <?php if(isset($msg)){?> <tr> <td colspan="2" align="center" valign="top"><?php echo $msg;?></td> </tr> <?php } ?> <tr> <td align="right" valign="top"> Validation code:</td> <td><img src="captcha.php?rand=<?php echo rand();?>" id='captchaimg'><br> <label for='message'>Enter the code above here :</label> <br> <input id="captcha_code" name="captcha_code" type="text"> <br> Can't read the image? click <a href='javascript: refreshCaptcha();'>here</a> to refresh.</td> </tr> <tr> <td> </td> <td><input name="Submit" type="submit" onclick="return validate();" value="Submit" class="button1"></td> </tr> </table> </form> </body> </html>