Software Development - A login system with PHP and MySQL

Many interactive websites nowadays require a user to log in into the website's system to provide a customized experience for the user. Once the user has logged in, the website will be able to provide a presentation that is personalized to the user's preferences.

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A basic login system typically contains 3 components which can be created using PHP and MySQL :

Component 1: Allows registration of preferred login Id and password.

This is created in simple HTML form that contains 3 fields and 2 buttons:

1. A preferred login id field

2. A preferred password field

3. A valid email address field

4. A Submit button

5. A Reset button

Lets say the form is coded into a file named register.html. The following HTML code extract is a typical example. When the user has filled in all the fields and clicks on the submit button, the register.php page is called for.

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 [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 extract can also be used as part of register.php to process the registration. The code 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 extract 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 of the user.

In this the HTML form typically contains 2 fields and 2 buttons:

1. A login id field

2. A password field

3. A Submit button

4. A Reset button

Assume that such a form is coded into a file named authenticate.html. The following HTML code extract 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.

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