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Change Password in Php

Posted By:satyapriyanayak       Posted Date: March 05, 2014    Points: 200    Category: General    URL: http://www.dotnetspark.com  

In this article we will know how to change password of a registered user. The registered user needs to login with his/her login credentials (user name and password). After successful login a Change password link will be visible. Here by clicking the link a new page will appear where user have to enter the new password and Confirm password and then click on update button to change his/her password respectively.
 

Introduction

In this article we will know how to change password of a registered user. The registered user needs to login with his/her login credentials (user name and password). After successful login a Change password link will be visible. Here by clicking the link a new page will appear where user have to enter the new password and Confirm password and then click on update button to change his/her password respectively.


Table structure

-- phpMyAdmin SQL Dump
-- version 2.10.1
-- http://www.phpmyadmin.net
--
-- Host: localhost
-- Generation Time: Jun 04, 2012 at 05:16 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 `user`
--

CREATE TABLE `user` (
  `id` int(11) NOT NULL auto_increment,
  `name` varchar(255) NOT NULL,
  `address` varchar(255) NOT NULL,
  `area` varchar(255) NOT NULL,
  `city` varchar(255) NOT NULL,
  `pin` int(11) NOT NULL,
  `state` varchar(255) NOT NULL,
  `country` varchar(255) NOT NULL,
  `mobile` varchar(50) NOT NULL,
  `email` varchar(255) NOT NULL,
  `user` varchar(255) NOT NULL,
  `password` varchar(200) NOT NULL,
  PRIMARY KEY  (`id`)
) ENGINE=MyISAM  DEFAULT CHARSET=latin1 AUTO_INCREMENT=3 ;

--
-- Dumping data for table `user`
--

INSERT INTO `user` (`id`, `name`, `address`, `area`, `city`, `pin`, `state`, `country`, `mobile`, `email`, `user`, `password`) VALUES
(1, 'Raj', 'New Ag colony plot no 4 block 3', 'Nayapalli', 'Bhubaneswar', 751013, 'Orissa', 'India', '9987654321', 'raj@yahoo.com', 'Raj Kumar', 'raj123'),
(2, 'Ravi', 'Bsnl colony plot no 6 block 4', 'Sahid Nagar', 'Bhubaneswar', 751012, 'Orissa', 'India', '9876543210', 'ravi@yahoo.com', 'Ravi Kumar', 'ravi123');

Now lets 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());

?>


Login.php

<?php
session_start();
include("config.php");
if($_REQUEST["btn_login"]=="Login")
{
$uname=$_POST["txt_login"];
$password=$_POST["txt_pwd"];
$sql="select * from user where user='".$uname."' and password='".$password."'";
//echo $sql;
//exit;
$res=mysql_query($sql);
if($rs=mysql_num_rows($res)>0)
{
 $_SESSION["uname"]=$uname;
 //echo $_SESSION["uname"];

echo "<script>location.href='welcome.php'</script>";
}
else
{
echo "<script>location.href='Login.php?qs=invalid'</script>";
}
}
?>
<script language="javascript" type="text/javascript">
function validate()
{
if(document.frm_login.txt_login.value=="")
{
alert("Please Enter user name");
document.frm_login.txt_login.focus();
return false;
}
if(document.frm_login.txt_pwd.value=="")
{
alert("Please Enter password");
document.frm_login.txt_pwd.focus();
return false;
}
return true;
}
</script>
<form name="frm_login" method="POST" action="Login.php" onSubmit="return validate();">
<table border="0" width="100%" cellspacing="0" cellpadding="0">
  <tr>
    <td colspan="2" width="100%" align="center"><br><br><b><font size=3>LOGIN FORM</font></b>&nbsp;
      <p>&nbsp;</p>
  </tr>
  <tr>
    <td width="20%" align="center"><img src="img/key_img.jpg"></td>
    <td width="75%" height="200">
      <table border="0" width="100%" cellpadding="4">
        <tr>
          <td colspan="2" align="center"></td>
        </tr>
          <tr>
          <td colspan="2" align="center"><font color="#EB3C37"></font></td>
        </tr>
        <tr>
          <td colspan="2" align="center"><br></td>
        </tr>
        <?php
        if($_REQUEST["qs"]=="invalid")
        {
        echo "<strong>Invalid Username or Password</strong>";
        }
        ?>
        <tr>
          <td width="30%" align="right">Username:</td>
         <td width="70%"><input type="text" name="txt_login" autocomplete="off"></td>
        </tr>
        <tr>
          <td align="right">Password:</td>
          <td><input type="password" name="txt_pwd"></td>
        </tr>
        <tr>
          <td>&nbsp;</td>
          <td><input type="submit" name="btn_login" value="Login"></td>
        </tr>
      </table>
      <tr>
          <td>&nbsp;</td>

        </tr>
    </td>
  </tr>
</table>
</form>


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">
<?php echo '<b>Welcome:</b>'.$_SESSION["uname"]; ?>
</form>
<a href="Changepassword.php">Changepassword</a>
</body>
</html>


Changepassword.php

<?php
session_start();
include("config.php");
if($_REQUEST["Submit"]=="Update")
{
    $sql="update user set password ='$_REQUEST[newpassword]' where user='$_SESSION[uname]'";
    //echo $sql;
    mysql_query($sql);
    header("Location:Changepassword.php?msg=updated");
}


?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD><TITLE>Change password</TITLE>
<script language="javascript" type="text/javascript">
    function validate()
    {

        var formName=document.frm;

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


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


            if(formName.newpassword.value != formName.cpassword.value)
            {
                document.getElementById("cpassword_label").innerHTML='Passwords Missmatch';
                formName.cpassword.focus()
                return false;
            }
            else
            {
                document.getElementById("cpassword_label").innerHTML='';
    }
    }
</script>
<style type="text/css">
<!--
.style1 {font-weight: bold}
.style7 {
    color: yellow;
    font-size: 24px;
}
.style9 {
    color: #FF6666;
    font-weight: bold;
}
.style12 {
    color: #666666;
    font-weight: bold;
}
.style14 {color: #CC0033; font-weight: bold; }
-->
</style>
<META http-equiv=Content-Type content="text/html; charset=windows-1252">
</HEAD>
<BODY>

<form action="Changepassword.php" method="post" name="frm" id="frm" onSubmit="return validate();">
            <table width="47%" border="1" cellspacing="0" cellpadding="0">
            <tr>
    <td colspan="2" align="center"></td>
    </tr>
  <tr bgcolor="#666666">
    <td colspan="2"><span class="style7">Change Password</span></td>
    </tr>
<?php if($_REQUEST[msg]=="updated") { ?>
 <tr bgcolor="#666666">
    <td colspan="2"><span class="style7">Password has been changed successfully.</span></td>
    </tr>
<?php } ?>
  <tr>
    <td bgcolor="#CCCCCC"><span class="style14">New Password:</span></td>
    <td bgcolor="#CCCCCC"><input type="password" name="newpassword" id="newpassword" size="20" autocomplete="off"/>&nbsp; <label id="newpassword_label" class="level_msg"></td>
  </tr>
  <tr>
    <td bgcolor="#CCCCCC"><span class="style14">Confirm Password:</span></td>
    <td bgcolor="#CCCCCC"><input type="password" name="cpassword" id="cpassword" size="20" autocomplete="off">&nbsp; <label id="cpassword_label" class="level_msg"></td>
  </tr>

  <tr bgcolor="#666666">
    <td colspan="2" align="center"><input type="submit" name="Submit" value="Update" onSubmit="return validate();"/></td>
    </tr>

</table>
<a href="Login.php">Login</a>
</form>
</BODY>
</HTML>


Conclusion

So here we learn how to Change Password in Php.



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