Wednesday, March 10, 2010

Sample PHP code for creating forgot password feature in any website



Most of the websites will require the users to register them for getting username/password which can be used for logging into their website.


It is very common that the users forget their password. So, the websites should allow the users to receive their password into their email using forgot password link available in the login page.

Find below the sample php code which can be used for implementing the forgot password feature.


$email_to=$_POST['email'];

if ($email_to == "") // Email address cannot be empty
{
header("Location: mail-password.php?send=Email not entered");
}
else
{
if(is_valid_email($email_to)) // check the valid email address or not
{
$to=$email_to;
$subject="QualityPoint Password"; // Your subject
// From
$header = 'From: info@qualitypointtech.net' . "\r\n" .
'Reply-To: info@qualitypointtech.net' . "\r\n" .
'X-Mailer: PHP/' . phpversion();
//add code for selecting $userid and $pass for user table for the input $email_to.
// Your message
$messages.="Forgot password - qualitypointtech.net \r\n";
$messages.="-------------------------------------- \r\n";
$messages.= "Your login information to our website is- \r\n";
$messages.="UserId: $userid \r\n";
$messages.="Password: $pass \r\n";
$messages.="-------------------------------------- \r\n";

// send email
$sentmail = mail($to,$subject,$messages,$header);

if($sentmail) //if your email succesfully sent
{
header("Location: mail-password.php?send=Password has been sent to your email id");
}
else // Cannot send password to your e-mail address
{
header("Location: mail-password.php?send=Not able to send email");
}
}

else //Email address has not been found in our database
{
header("Location: mail-password.php?send=Email address not found");
}
}


function is_valid_email( $address )
{
$rx = "^[a-z0-9\\_\\.\\-]+\\@[a-z0-9\\-]+\\.[a-z0-9\\_\\.\\-]+\\.?[a-z]{1,4}$";
return (preg_match("~".$rx."~i", $address));
}




The step involved are,
1. First provide a form with input text box with name "email" for allowing the user to enter his email id.

2. On submitting this form, the "email" will be posted to the php page mail-password.php.

3. From user table, query the password corresponding to the entered email id. (If you have stored the password in encrypted form then reset it with default/random password and send this default/random password to the user)

4. Validate the email id.

5. Prepare the email message and send it using php mail() function.


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4 comments:

geeks said...

Yes, I agreed... I also forgot password frequently. Your post was really good and helpfull. Thanks

There are many similar posts at
www.geeks4share.com

Carbonize said...

That was probably good back in the 90s but is exceedingly poor for this day and age. For a start the string being sent in the Location header should be URL encoded. Then we get the fact that the is_valid_email function will not work on non-latin email addresses nor TLDs such as .museum.

Anonymous said...

Use filter_input / filter_var to scan for valid emails.

Carbonize said...

filter_var is flawed and not to be relied on.



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