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Such a system can be easily created using PHP and MySQL.

Component 1 Registration

Component 1 is typically implemented using a simple HTML form that contains 3 fields and 2 buttons:

Assume that such a form is coded into a file named register.html. The following HTML code excerpt is a typical example. When the user has filled in all the fields, the register.php page is called when the user clicks on the Submit button.

[form name="register" method="post" action="register.php"]

[input name="login id" type="text" value="loginid" size="20"/][br]

[input name="password" type="text" value="password" size="20"/][br]

[input name="email" type="text" value="email" size="50"/][br]

[input type="submit" name="submit" value="submit"/]

[input type="reset" name="reset" value="reset"/]

[/form]

The following code excerpt can be used as part of register.php to process the registration. It connects to the MySQL database and inserts a line of data into the table used to store the registration information.

@mysql_connect("localhost", "mysql_login", "mysql_pwd") or die("Cannot connect to DB!");

@mysql_select_db("tbl_login") or die("Cannot select DB!");

$sql="INSERT INTO login_tbl (loginid, password and email) VALUES (".$loginid.,.$password.,.$email.);

$r = mysql_query($sql);

if(!$r) {

$err=mysql_error();

print $err;

exit();

}

The code excerpt assumes that the MySQL table that is used to store the registration data is named tbl_login and contains 3 fields the loginid, password and email fields. The values of the $loginid, $password and $email variables are passed in from the form in register.html using the post method.

Component 2 Verification and Authentication

A registered user will want to log into the system to access the functionality provided by the website. The user will have to provide his login id and password for the system to verify and authenticate.

This is typically done through a simple HTML form. This HTML form typically contains 2 fields and 2 buttons:

Assume that such a form is coded into a file named authenticate.html. The following HTML code excerpt is a typical example. When the user has filled in all the fields, the authenticate.php page is called when the user clicks on the Submit button.

[form name="authenticate" method="post" action="authenticate.php"]

[input name="login id" type="text" value="loginid" size="20"/][br]

[input name="password" type="text" value="password" size="20"/][br]

[input type="submit" name="submit" value="submit"/]

[input type="reset" name="reset" value="reset"/]

[/form]

The following code excerpt can be used as part of authenticate.php to process the login request. It connects to the MySQL database and queries the table used to store the registration information.

@mysql_connect("localhost", "mysql_login", "mysql_pwd") or die("Cannot connect to DB!");

@mysql_select_db("tbl_login") or die("Cannot select DB!");

$sql="SELECT loginid FROM login_tbl WHERE loginid=".$loginid. and password=.$password.;

$r = mysql_query($sql);

if(!$r) {

$err=mysql_error();

print $err;

exit();

}

if(mysql_affected_rows()==0){

print "no such login in the system. please try again.";

exit();

}

else{

print "successfully logged into system.";

//proceed to perform websites functionality e.g. present information to the user

}

As in component 1, the code excerpt assumes that the MySQL table that is used to store the registration data is named tbl_login and contains 3 fields the loginid, password and email fields. The values of the $loginid and $password variables are passed in from the form in authenticate.html using the post method.

Component 3 Forgot Password

A registered user may forget his password to log into the websites system. In this case, the user will need to supply his loginid for the system to retrieve his password and send the password to the users registered email address.

This is typically done through a simple HTML form. This HTML form typically contains 1 field and 2 buttons:

Assume that such a form is coded into a file named forgot.html. The following HTML code excerpt is a typical example. When the user has filled in all the fields, the forgot.php page is called when the user clicks on the Submit button.

[form name="forgot" method="post" action="forgot.php"]

[input name="login id" type="text" value="loginid" size="20"/][br]

[input type="submit" name="submit" value="submit"/]

[input type="reset" name="reset" value="reset"/]

[/form]

The following code excerpt can be used as part of forgot.php to process the login request. It connects to the MySQL database and queries the table used to store the registration information.

@mysql_connect("localhost", "mysql_login", "mysql_pwd") or die("Cannot connect to DB!");

@mysql_select_db("tbl_login") or die("Cannot select DB!");

$sql="SELECT password, email FROM login_tbl WHERE loginid=".$loginid.;

$r = mysql_query($sql);

if(!$r) {

$err=mysql_error();

print $err;

exit();

}

if(mysql_affected_rows()==0){

print "no such login in the system. please try again.";

exit();

}

else {

$row=mysql_fetch_array($r);

$password=$row["password"];

$email=$row["email"];

$subject="your password";

$header="from:you@yourdomain.com";

$content="your password is ".$password;

mail($email, $subject, $row, $header);

print "An email containing the password has been sent to you";

}

As in component 1, the code excerpt assumes that the MySQL table that is used to store the registration data is named tbl_login and contains 3 fields the loginid, password and email fields. The value of the $loginid variable is passed from the form in forgot.html using the post method.

Conclusion

The above example is to illustrate how a very basic login system can be implemented. The example can be enhanced to include password encryption and additional functionality e.g. to allow users to edit their login information.

- Used with the authors permission.

About The Author

Used with the authors permission.

This article is written by daBoss. daBoss is the Webmaster of Designer Banners. daBoss can be contacted at sales (at) designerbanners (dot) com.

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