Developing a Login System with PHP and MySQL

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Free Templates Home arrow Webmaster Articles arrow Programming arrow Developing a Login System with PHP and MySQL

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Developing a Login System with PHP and MySQL Print E-mail
Written by daBoss   
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Developing a Login System with PHP and MySQL
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Most interactive websites nowadays would require a user to log in into the website’s system in order 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 tailored to the user’s preferences.

A basic login system typically contains 3 components:

  • The component that allows a user to register his preferred login id and password
  • The component that allows the system to verify and authenticate the user when he subsequently logs in
  • The component that sends the user’s password to his registered email address if the user forgets his password

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:

  • A preferred login id field
  • A preferred password field
  • A valid email address field
  • A Submit button
  • A Reset button

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"/]

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) {
print $err;

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.


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