Implementation of Captcha in Registration Form in PHP

Satyapriya Nayak
12y
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Article

Introduction

In this article we will create a registration page with CAPTCHA implemented in it in PHP.

Before going forward we should know what is CAPTCHA?

CAPTCHA

Completely Automated Public Turing test to tell Computers and Humans Apart. A CAPTCHA is a program that protects websites against bots by generating and grading tests that humans can pass but current computer programs cannot. For example, humans can read distorted text but current computer programs can't.

Characteristics: A CAPTCHA is a means of automatically generating challenges which intends to:

Provide a problem easy enough for all humans to solve.
Prevent standard automated software from filling out a form, unless it is specially designed to circumvent specific CAPTCHA systems.

Here we use JavaScript for validation.

Table structure

-- phpMyAdmin SQL Dump
-- version 2.10.1
-- http://www.phpmyadmin.net
--
-- Host: localhost
-- Generation Time: Jun 04, 2012 at 12:46 PM
-- Server version: 5.0.45
-- PHP Version: 5.2.5

SET SQL_MODE="NO_AUTO_VALUE_ON_ZERO";

--
-- Database: `Work`
--

-- --------------------------------------------------------

--
-- Table structure for table `employee`
--

CREATE TABLE `employee` (
`fullname` varchar(255) NOT NULL,
`email` varchar(255) NOT NULL,
`dob` varchar(255) NOT NULL,
`gender` varchar(255) NOT NULL,
`company` varchar(255) NOT NULL,
`designation` varchar(255) NOT NULL,
`address` varchar(255) NOT NULL,
`city` varchar(255) NOT NULL,
`state` varchar(255) NOT NULL,
`zip` varchar(255) NOT NULL,
`phone` varchar(255) NOT NULL,
`fax` varchar(255) NOT NULL,
`website` varchar(255) NOT NULL,
`country` varchar(255) NOT NULL,
`password` varchar(255) NOT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1;

--
-- Dumping data for table `employee`
--

Now let's move to the coding part.

For creating database connection:

Config.php

<?php

$sDbHost = 'localhost';
$sDbName = 'Work';
$sDbUser = 'root';
$sDbPwd = '';

$dbConn = mysql_connect ($sDbHost, $sDbUser, $sDbPwd) or die ('MySQL connect failed. ' . mysql_error());
mysql_select_db($sDbName,$dbConn) or die('Cannot select database. ' . mysql_error());

?>

For creating random image:

get_captcha.php

<?php
session_start();

$string = '';

for ($i = 0; $i < 5; $i++) {
$string .= chr(rand(97, 122));
}

$_SESSION['random_number'] = $string;

$dir = 'fonts/';

$image = imagecreatetruecolor(165, 50);

// random number 1 or 2
$num = rand(1,2);
if($num==1)
{
$font = "Capture it 2.ttf"; // font style
}
else
{
$font = "Molot.otf";// font style
}

// random number 1 or 2
$num2 = rand(1,2);
if($num2==1)
{
$color = imagecolorallocate($image, 113, 193, 217);// color
}
else
{
$color = imagecolorallocate($image, 163, 197, 82);// color
}

$white = imagecolorallocate($image, 255, 255, 255); // background color white
imagefilledrectangle($image,0,0,399,99,$white);

imagettftext ($image, 20, 0, 10, 30, $color, $dir.$font, $_SESSION['random_number']);

header("Content-type: image/png");
imagepng($image);

?>

For Registration of users:

registration.php

<?php
session_start();
include('config.php');
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Employee Registration</title>

<link href="style.css" rel="stylesheet" type="text/css" />
<script type="text/javascript" src="js/jquery-1.3.2.min.js"></script>

<script type="text/javascript" src="js/jquery-1.3.2.js"></script>
<script type="text/javascript" src="js/simpleCal.js"></script>

<script language="javascript" type="text/javascript">

function validation()
{
var formName=document.frm;
var emailExp = /^[\w\-\.\+]+\@[a-zA-Z0-9\.\-]+\.[a-zA-z0-9]{2,4}$/;

var urlExp = /^(((ht|f){1}(tp:[/][/]){1})|((www.){1}))[-a-zA-Z0-9@:%_\+.~#?&//=]+$/;

if(formName.fullname.value == "")
{
document.getElementById("fullname_label").innerHTML='Please Enter First Name';
formName.fullname.focus();
return false;
}
else
{
document.getElementById("fullname_label").innerHTML='';
}

if(formName.email.value == "")
{
document.getElementById("email_label").innerHTML='Please Enter Email';
formName.email.focus();
return false;
}
else
{
document.getElementById("email_label").innerHTML='';
}

if(!(formName.email.value).match(emailExp))
{
document.getElementById("email_label").innerHTML='Please Enter Valid Email';
formName.email.focus()
return false;
}
else
{
document.getElementById("email_label").innerHTML='';
}

if(formName.dob.value == "")
{
document.getElementById("dob_label").innerHTML='Please Enter Date of Birth';
formName.dob.focus();
return false;
}
else
{
document.getElementById("dob_label").innerHTML='';
}

if(formName.company.value == "")
{
document.getElementById("company_label").innerHTML='Please Enter Company';
formName.company.focus();
return false;
}
else
{
document.getElementById("company_label").innerHTML='';
}

if(formName.designation.value == "")
{
document.getElementById("designation_label").innerHTML='Please Enter Designation';
formName.designation.focus();
return false;
}
else
{
document.getElementById("designation_label").innerHTML='';
}

if(formName.address.value == "")
{
document.getElementById("address_label").innerHTML='Please Enter Address';
formName.address.focus();
return false;
}
else
{
document.getElementById("address_label").innerHTML='';
}

if(formName.city.value == "")
{
document.getElementById("city_label").innerHTML='Please Enter City';
formName.city.focus();
return false;
}
else
{
document.getElementById("city_label").innerHTML='';
}

if(formName.state.value == "")
{
document.getElementById("state_label").innerHTML='Please Enter State';
formName.state.focus();
return false;
}
else
{
document.getElementById("state_label").innerHTML='';
}

if(formName.zip.value == "")
{
document.getElementById("zip_label").innerHTML='Please Enter Zip Code';
formName.zip.focus();
return false;
}
else
{
document.getElementById("zip_label").innerHTML='';
}

if(formName.phone.value == "")
{
document.getElementById("phone_label").innerHTML='Please Enter Phone Number';
formName.phone.focus();
return false;
}
else
{
document.getElementById("phone_label").innerHTML='';
}

if(formName.fax.value == "")
{
document.getElementById("fax_label").innerHTML='Please Enter Fax Number';
formName.fax.focus();
return false;
}
else
{
document.getElementById("fax_label").innerHTML='';
}

if(formName.website.value == "")
{
document.getElementById("website_label").innerHTML='Please Enter Website';
formName.website.focus();
return false;
}
else
{
document.getElementById("website_label").innerHTML='';
}

if(!(formName.website.value).match(urlExp))
{
document.getElementById("website_label").innerHTML='Please Enter Valid Website';
formName.website.focus()
return false;
}
else
{
document.getElementById("website_label").innerHTML='';
}

if(formName.password.value == "")
{
document.getElementById("password_label").innerHTML='Please Enter Password';
formName.password.focus();
return false;
}
else
{
document.getElementById("password_label").innerHTML='';
}

if(formName.cpassword.value == "")
{
document.getElementById("cpassword_label").innerHTML='PleaseEnterConfirmPassword';
formName.cpassword.focus();
return false;
}
else
{
document.getElementById("cpassword_label").innerHTML='';
}

if(formName.password.value != formName.cpassword.value)
{
document.getElementById("cpassword_label").innerHTML='Passwords Missmatch';
formName.cpassword.focus()
return false;
}
else
{
document.getElementById("cpassword_label").innerHTML='';
}

if(formName.code.value == "")
{
document.getElementById("code_label").innerHTML='Please Enter Code';
formName.code.focus();
return false;
}
else
{
document.getElementById("code_label").innerHTML='';
}

if($('input:radio[name=gender]:checked').length==0){
$('#gender_label').html('Please Choose option');
return false;
}
if($('input:radio[name=gender]:checked').val()==1){
if($('#gender').val()==''){
$("#gender_label").html('Enter Your gender');
return false;
}else{
$("#gender_label").html('');
}
}

}

$(function(){
$('input:radio[name=gender]').click(function(){

$('#gender_label').html('');
});
$('#gender').click(function(){
$('#gender').val('');
});
});

function Phone(evt)
{
var charCode = (evt.which) ? evt.which : event.keyCode

if ((charCode >= 97 && charCode <=122) || ((charCode >= 65 && charCode <=90)))
{
return false;
}
else if((charCode>=48 && charCode <=57) || charCode==43 || charCode==32 || charCode==45 || charCode==40 || charCode==41 || charCode==8)
{
return true;
}
else
{
return false;
}
}

</script>
</head>
<script>

$(document).ready(function() {

$('#Send').click(function() {

$.post("post.php?"+$("#MYFORM").serialize(),
{

},

function(response)
{
});

return false;
});

// refresh captcha
$('img#refresh').click(function() {

change_captcha();
});

function change_captcha()
{
document.getElementById('captcha').src="get_captcha.php?rnd=" + Math.random();
}

function clear_form()
{
$("#name").val('');
$("#email").val('');
$("#message").val('');
}
});

</script>

<?php
if($_REQUEST["action"]=='register')
{

if(strtolower($_REQUEST['code']) == strtolower($_SESSION['random_number']))
{
$sql="select * from employee where email ='$_REQUEST[email]'";
$sql_row=mysql_query($sql);
$num=mysql_num_rows($sql_row);
if($num>0)
{
echo "<script>window.location.href='registration.php?msg=exist'</script>";
exit;
}
else
{

$str="insert into employee set fullname='$_REQUEST[fullname]',email='$_REQUEST[email]',dob='$_REQUEST[dob]',gender='$_REQUEST[gender]',company='$_REQUEST[company]',designation='$_REQUEST[designation]',address='$_REQUEST[address]',city='$_REQUEST[city]',state='$_REQUEST[state]',zip='$_REQUEST[zip]',phone='$_REQUEST[phone]',fax='$_REQUEST[fax]',website='$_REQUEST[website]',country='$_REQUEST[country]',password='$_REQUEST[password]'";
mysql_query($str);
$mesg="Success";
echo "<script>window.location.href='welcome.php'</script>";
//exit;
}
}
else
{
echo "<script>window.location.href='registration.php?msg=invalid&fullname=$_REQUEST[fullname]&email=$_REQUEST[email]&dob=$_REQUEST[dob]&company=$_REQUEST[company]&designation=$_REQUEST[designation]&address=$_REQUEST[address]&city=$_REQUEST[city]&state=$_REQUEST[state]&zip=$_REQUEST[zip]&phone=$_REQUEST[phone]&fax=$_REQUEST[fax]&website=$_REQUEST[website]'</script>";
exit;

}
}

?>

<body>

<form method="post" id="frm" name="frm" action="registration.php?action=register" onSubmit="return validation();">
<table width="500" border="0">

<?php if($_REQUEST["msg"]=='invalid') { ?>
<tr>
<td height="30"> </td>
<td class="redText2">Invalid captcha code </td>
</tr>
<?php } ?>

<?php if($_REQUEST[msg]=='exist') { ?>
<tr>
<td height="30"> </td>
<td class="redText2">Email Address is already in use.Try with another. </td>
</tr>
<?php } ?>
<?php if($_REQUEST[msg]=='success') { ?>
<tr>
<td height="30"> </td>
<td class="greenText">Registered Successfully </td>
</tr>
<?php } ?>
<tr>
<td class="deepbluetextbold"><b>Employee Registration</b></td>
</tr>
<tr>
<td class="colouredCell">Name*</td>
<td>
<input type="text" name="fullname" id="fullname" autocomplete="off" value="<?php echo $_REQUEST[fullname]; ?>"/>  <label id="fullname_label" class="level_msg"></label> </td>
</tr>
<tr>
<td class="colouredCell">Email*</td>
<td><input type="text" name="email" id="email" autocomplete="off" value="<?php echo $_REQUEST[email]; ?>"/>  <label id="email_label" class="level_msg"></label></td>
</tr>
<tr>
<td class="colouredCell">Date of Birth*</td>
<td><input type="text" name="dob" id="dob" autocomplete="off" value="<?php echo $_REQUEST[dob]; ?>"/>  <label id="dob_label" class="level_msg"></label>

<a href="#" onclick="scwShow (document.getElementById('dob'), event); return false;" />
<img border="0" alt="" src="images/calendar.png" />
<span id="lbldob" style="color:Red;font-weight:bold;"></span>
</td>
</tr>
<tr>
<td class="colouredCell">Gender*</td>
<td>
<input name="gender" type="radio" value="male"/>Male
<input name="gender" type="radio" value="female"/>Female
  <label id="gender_label" class="level_msg"></label> </td>
</tr>
<tr>
<td class="colouredCell">Company*</td>
<td><input type="text" name="company" id="company" autocomplete="off" value="<?php echo $_REQUEST[company]; ?>"/>  <label id="company_label" class="level_msg"></label></td>
</tr>
<tr>
<td class="colouredCell">Designation*</td>
<td><input type="text" name="designation" id="designation" autocomplete="off" value="<?php echo $_REQUEST[designation]; ?>"/>  <label id="designation_label" class="level_msg"></label></td>
</tr>
<tr>
<td class="colouredCell">Street Address*</td>
<td><input type="text" name="address" id="address" autocomplete="off" value="<?php echo $_REQUEST[address]; ?>"/>  <label id="address_label" class="level_msg"></label></td>
</tr>
<tr>
<td class="colouredCell">City*</td>
<td><input type="text" name="city" id="city" autocomplete="off" value="<?php echo $_REQUEST[city]; ?>"/>  <label id="city_label" class="level_msg"></label></td>
</tr>
<tr>
<td class="colouredCell">State*</td>
<td><input type="text" name="state" id="state" autocomplete="off" value="<?php echo $_REQUEST[state]; ?>"/>  <label id="state_label" class="level_msg"></label></td>
</tr>
<tr>
<td class="colouredCell">Zip Code*</td>
<td><input type="text" name="zip" id="zip" autocomplete="off" value="<?php echo $_REQUEST[zip]; ?>"/>  <label id="zip_label" class="level_msg"></label></td>
</tr>
<tr>
<td class="colouredCell">Phone*</td>
<td><input type="text" name="phone" id="phone" autocomplete="off" onKeyPress="return Phone(event);" value="<?php echo $_REQUEST[phone]; ?>"/>  <label id="phone_label" class="level_msg"></label></td>
</tr>
<tr>
<td class="colouredCell">Fax*</td>
<td><input type="text" name="fax" id="fax" autocomplete="off" onKeyPress="return Phone(event);" value="<?php echo $_REQUEST[fax]; ?>"/>  <label id="fax_label" class="level_msg"></label></td>
</tr>
<tr>
<td class="colouredCell">Website*</td>
<td><input type="text" name="website" id="website" autocomplete="off" value="<?php echo $_REQUEST[website]; ?>"/>  <label id="website_label" class="level_msg"></label></td>
</tr>

<tr>
<td class="colouredCell">Country*</td>
<td>
<select class="" id="country" name="country" aria-required="true">
<option value="" selected="selected">Select One</option>
<option value="af" >Afghanistan</option>

<option value="ax" >Aland Islands</option>
<option value="al" >Albania</option>
<option value="dz" >Algeria</option>
<option value="as" >American Samoa</option>
<option value="ad" >Andorra</option>
<option value="ao" >Angola</option>

<option value="ai" >Anguilla</option>
<option value="aq" >Antarctica</option>
<option value="ag" >Antigua and Barbuda</option>
<option value="ar" >Argentina</option>
<option value="am" >Armenia</option>
<option value="aw" >Aruba</option>

<option value="au" >Australia</option>
<option value="at" >Austria</option>
<option value="az" >Azerbaijan</option>
<option value="bs" >Bahamas</option>
<option value="bh" >Bahrain</option>
<option value="bd" >Bangladesh</option>

<option value="bb" >Barbados</option>
<option value="by" >Belarus</option>
<option value="be" >Belgium</option>
<option value="bz" >Belize</option>
<option value="bj" >Benin</option>
<option value="bm" >Bermuda</option>

<option value="bt" >Bhutan</option>
<option value="bo" >Bolivia</option>
<option value="ba" >Bosnia and Herzegovina</option>
<option value="bw" >Botswana</option>
<option value="bv" >Bouvet Island</option>
<option value="br" >Brazil</option>

<option value="io" >British Indian Ocean Territory</option>
<option value="vg" >British Virgin Islands</option>
<option value="bn" >Brunei</option>
<option value="bg" >Bulgaria</option>
<option value="bf" >Burkina Faso</option>
<option value="bi" >Burundi</option>

<option value="kh" >Cambodia</option>
<option value="cm" >Cameroon</option>
<option value="ca" >Canada</option>
<option value="cv" >Cape Verde</option>
<option value="ky" >Cayman Islands</option>
<option value="cf" >Central African Republic</option>

<option value="td" >Chad</option>
<option value="cl" >Chile</option>
<option value="cn" >China</option>
<option value="cx" >Christmas Island</option>
<option value="cc" >Cocos (Keeling) Islands</option>
<option value="co" >Colombia</option>

<option value="km" >Union of the Comoros</option>
<option value="cg" >Congo</option>
<option value="ck" >Cook Islands</option>
<option value="cr" >Costa Rica</option>
<option value="hr" >Croatia</option>
<option value="cu" >Cuba</option>

<option value="cy" >Cyprus</option>
<option value="cz" >Czech Republic</option>
<option value="cd" >Democratic Republic of Congo</option>
<option value="dk" >Denmark</option>
<option value="xx" >Disputed Territory</option>
<option value="dj" >Djibouti</option>

<option value="dm" >Dominica</option>
<option value="do" >Dominican Republic</option>
<option value="tl" >East Timor</option>
<option value="ec" >Ecuador</option>
<option value="eg" >Egypt</option>
<option value="sv" >El Salvador</option>

<option value="gq" >Equatorial Guinea</option>
<option value="er" >Eritrea</option>
<option value="ee" >Estonia</option>
<option value="et" >Ethiopia</option>
<option value="fk" >Falkland Islands</option>
<option value="fo" >Faroe Islands</option>

<option value="fm" >Federated States of Micronesia</option>
<option value="fj" >Fiji</option>
<option value="fi" >Finland</option>
<option value="fr" >France</option>
<option value="gf" >French Guyana</option>
<option value="pf" >French Polynesia</option>

<option value="tf" >French Southern Territories</option>
<option value="ga" >Gabon</option>
<option value="gm" >Gambia</option>
<option value="ge" >Georgia</option>
<option value="de" >Germany</option>
<option value="gh" >Ghana</option>

<option value="gi" >Gibraltar</option>
<option value="gr" >Greece</option>
<option value="gl" >Greenland</option>
<option value="gd" >Grenada</option>
<option value="gp" >Guadeloupe</option>
<option value="gu" >Guam</option>

<option value="gt" >Guatemala</option>
<option value="gn" >Guinea</option>
<option value="gw" >Guinea-Bissau</option>
<option value="gy" >Guyana</option>
<option value="ht" >Haiti</option>
<option value="hm" >Heard Island and McDonald Islands</option>

<option value="hn" >Honduras</option>
<option value="hk" >Hong Kong</option>
<option value="hu" >Hungary</option>
<option value="is" >Iceland</option>
<option value="India" >India</option>
<option value="id" >Indonesia</option>

<option value="ir" >Iran</option>
<option value="iq" >Iraq</option>
<option value="xe" >Iraq-Saudi Arabia Neutral Zone</option>
<option value="ie" >Ireland</option>
<option value="il" >Israel</option>
<option value="it" >Italy</option>

<option value="ci" >Ivory Coast</option>
<option value="jm" >Jamaica</option>
<option value="jp" >Japan</option>
<option value="jo" >Jordan</option>
<option value="kz" >Kazakhstan</option>
<option value="ke" >Kenya</option>

<option value="ki" >Kiribati</option>
<option value="kw" >Kuwait</option>
<option value="kg" >Kyrgyz Republic</option>
<option value="la" >Laos</option>
<option value="lv" >Latvia</option>
<option value="lb" >Lebanon</option>

<option value="ls" >Lesotho</option>
<option value="lr" >Liberia</option>
<option value="ly" >Libya</option>
<option value="li" >Liechtenstein</option>
<option value="lt" >Lithuania</option>
<option value="lu" >Luxembourg</option>

<option value="mo" >Macau</option>
<option value="mk" >Macedonia</option>
<option value="mg" >Madagascar</option>
<option value="mw" >Malawi</option>
<option value="my" >Malaysia</option>
<option value="mv" >Maldives</option>

<option value="ml" >Mali</option>
<option value="mt" >Malta</option>
<option value="mh" >Marshall Islands</option>
<option value="mq" >Martinique</option>
<option value="mr" >Mauritania</option>
<option value="mu" >Mauritius</option>

<option value="yt" >Mayotte</option>
<option value="mx" >Mexico</option>
<option value="md" >Moldova</option>
<option value="mc" >Monaco</option>
<option value="mn" >Mongolia</option>
<option value="ms" >Montserrat</option>

<option value="ma" >Morocco</option>
<option value="mz" >Mozambique</option>
<option value="mm" >Myanmar</option>
<option value="na" >Namibia</option>
<option value="nr" >Nauru</option>
<option value="np" >Nepal</option>

<option value="nl" >Netherlands</option>
<option value="an" >Netherlands Antilles</option>
<option value="nc" >New Caledonia</option>
<option value="nz" >New Zealand</option>
<option value="ni" >Nicaragua</option>
<option value="ne" >Niger</option>

<option value="ng" >Nigeria</option>
<option value="nu" >Niue</option>
<option value="nf" >Norfolk Island</option>
<option value="kp" >North Korea</option>
<option value="mp" >Northern Mariana Islands</option>
<option value="no" >Norway</option>

<option value="om" >Oman</option>
<option value="pk" >Pakistan</option>
<option value="pw" >Palau</option>
<option value="ps" >Palestinian Territories</option>
<option value="pa" >Panama</option>
<option value="pg" >Papua New Guinea</option>

<option value="py" >Paraguay</option>
<option value="pe" >Peru</option>
<option value="ph" >Philippines</option>
<option value="pn" >Pitcairn Islands</option>
<option value="pl" >Poland</option>
<option value="pt" >Portugal</option>

<option value="pr" >Puerto Rico</option>
<option value="qa" >Qatar</option>
<option value="re" >Reunion</option>
<option value="ro" >Romania</option>
<option value="ru" >Russia</option>
<option value="rw" >Rwanda</option>

<option value="sh" >Saint Helena and Dependencies</option>
<option value="kn" >Saint Kitts & Nevis</option>
<option value="lc" >Saint Lucia</option>
<option value="pm" >Saint Pierre and Miquelon</option>
<option value="vc" >Saint Vincent and the Grenadines</option>
<option value="ws" >Samoa</option>

<option value="sm" >San Marino</option>
<option value="st" >Sao Tome and Principe</option>
<option value="sa" >Saudi Arabia</option>
<option value="sn" >Senegal</option>
<option value="sc" >Seychelles</option>
<option value="sl" >Sierra Leone</option>

<option value="sg" >Singapore</option>
<option value="sk" >Slovakia</option>
<option value="si" >Slovenia</option>
<option value="sb" >Solomon Islands</option>
<option value="so" >Somalia</option>
<option value="za" >South Africa</option>

<option value="gs" >South Georgia and the South Sandwich Islands</option>
<option value="kr" >South Korea</option>
<option value="es" >Spain</option>
<option value="pi" >Spratly Islands</option>
<option value="lk" >Sri Lanka</option>
<option value="sd" >Sudan</option>

<option value="sr" >Suriname</option>
<option value="sj" >Svalbard and Jan Mayen Islands</option>
<option value="sz" >Swaziland</option>
<option value="se" >Sweden</option>
<option value="ch" >Switzerland</option>
<option value="sy" >Syria</option>

<option value="tw" >Taiwan</option>
<option value="tj" >Tajikistan</option>
<option value="tz" >Tanzania</option>
<option value="th" >Thailand</option>
<option value="tg" >Togo</option>
<option value="tk" >Tokelau</option>

<option value="to" >Tonga</option>
<option value="tt" >Trinidad and Tobago</option>
<option value="tn" >Tunisia</option>
<option value="tr" >Turkey</option>
<option value="tm" >Turkmenistan</option>
<option value="tc" >Turks and Caicos Islands</option>

<option value="tv" >Tuvalu</option>
<option value="ug" >Uganda</option>
<option value="ua" >Ukraine</option>
<option value="ae" >United Arab Emirates</option>
<option value="uk" >United Kingdom</option>
<option value="us" >United States</option>

<option value="um" >United States Minor Outlying Islands</option>
<option value="uy" >Uruguay</option>
<option value="vi" >US Virgin Islands</option>
<option value="uz" >Uzbekistan</option>
<option value="vu" >Vanuatu</option>
<option value="va" >Vatican City</option>

<option value="ve" >Venezuela</option>
<option value="vn" >Vietnam</option>
<option value="wf" >Wallis and Futuna Islands</option>
<option value="eh" >Western Sahara</option>
<option value="ye" >Yemen</option>
<option value="zm" >Zambia</option>

<option value="zw" >Zimbabwe</option>
<option value="rs" >Serbia</option>
<option value="me" >Montenegro</option>
</select>
</td>
</tr>

<tr>
<td class="colouredCell">Password*</td>
<td><input type="password" name="password" id="password" autocomplete="off"/>  <label id="password_label" class="level_msg"></td>
</tr>
<tr>
<td class="colouredCell">Confirmpassword*</td>
<td><input type="password" name="cpassword" id="cpassword" autocomplete="off"/>  <label id="cpassword_label" class="level_msg"></td>
</tr>

<tr>
<td class="colouredCell">Type the code shown*</td>
<td>
<table border="0" cellpadding="0" cellspacing="0" width="200" style="border-collapse:collapse;">
<tr>
<td width="152" align="left">
<img src="get_captcha.php" alt="" id="captcha" /></td>
<td width="48" align="left"><img src="images/refresh.jpg" width="25" alt="" id="refresh" style="cursor:pointer;"/></td>
</tr>
<tr>
<td><input name="code" type="text" id="code" autocomplete="off"/></td>
<td width="48"></td>
</tr>

</table>
<label id="code_label" class="code_label">
</td>
</tr>
<tr>
<td>
<input type="submit" name="Submit" value="Register" /> </td>
<td> </td>
</tr>
</table>
</form>
</body>
</html>

welcome.php

<?php
session_start();
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Welcome</title>
</head>
<body>
<form action="welcome.php" method="post" name="welcome">
<b>Registration Successfully Completed</b><br/>
<a href="registration.php">New User?</a>
</form>
</body>
</html>

Output

Conclusion

So here we learn how create a registration page with CAPTCHA implemented in it in PHP.

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